<div class="solution-view">
    <h3>运行 ID: <a href="/solution/detail?id=51639">51639</a></h3>
                        <pre>Main.cc: In function ‘int main()’:
Main.cc:5:9: error: no match for ‘operator&lt;&lt;’ (operand types are ‘std::istream {aka std::basic_istream}’ and ‘int’)
     cin &lt;&lt; m &lt;&lt; n;
     ~~~~^~~~
Main.cc:5:9: note: candidate: operator&lt;&lt;(int, int) 
Main.cc:5:9: note:   no known conversion for argument 1 from ‘std::istream {aka std::basic_istream}’ to ‘int’
In file included from /usr/include/c++/7/regex:62:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:110,
                 from Main.cc:1:
/usr/include/c++/7/bits/regex.h:1525:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::__cxx11::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::__cxx11::sub_match&lt;_Bi_iter&gt;&amp;)
     operator&lt;&lt;(basic_ostream&lt;_Ch_type, _Ch_traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/regex.h:1525:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:3160:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::piecewise_linear_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:3160:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2944:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::piecewise_constant_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2944:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2734:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::discrete_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2734:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2275:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::student_t_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2275:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2200:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::fisher_f_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2200:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2036:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::chi_squared_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2036:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1963:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::lognormal_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1963:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1667:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::binomial_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1667:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1400:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::poisson_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1400:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1195:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::negative_binomial_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1195:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:831:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::shuffle_order_engine&lt;_RandomNumberEngine, __k&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:831:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:702:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::discard_block_engine&lt;_RandomNumberEngine, __p, __r&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:702:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:632:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::subtract_with_carry_engine&lt;_UIntType, __w, __s, __r&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:632:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:156:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::linear_congruential_engine&lt;_UIntType, __a, __c, __m&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:156:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2598:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::extreme_value_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2598:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2522:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::weibull_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2522:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1731:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::exponential_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1731:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2444:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::gamma_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2444:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1080:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::geometric_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1080:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:1898:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::normal_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:1898:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:998:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::bernoulli_distribution&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:998:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:2123:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::cauchy_distribution&lt;_RealType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:2123:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:936:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::uniform_real_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:936:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:877:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::uniform_int_distribution&lt;_IntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:877:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:51:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.tcc:477:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::mersenne_twister_engine&lt;_UIntType, __w, __n, __m, __r, __a, __u, __d, __s, __b, __t, __c, __l, __f&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.tcc:477:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/random:49:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:108,
                 from Main.cc:1:
/usr/include/c++/7/bits/random.h:1269:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::independent_bits_engine&lt;_RandomNumberEngine, __w, _UIntType&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/random.h:1269:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/future:39:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:105,
                 from Main.cc:1:
/usr/include/c++/7/thread:313:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, std::thread::id)
     operator&lt;&lt;(basic_ostream&lt;_CharT, _Traits&gt;&amp; __out, thread::id __id)
     ^~~~~~~~
/usr/include/c++/7/thread:313:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from Main.cc:1:
/usr/include/c++/7/valarray:1180:1: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const _Tp&amp;, const std::valarray&lt;_Tp&gt;&amp;)
 _DEFINE_BINARY_OPERATOR(&lt;&lt;, __shift_left)
 ^
/usr/include/c++/7/valarray:1180:1: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   mismatched types ‘const std::valarray&lt;_Tp&gt;’ and ‘int’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from Main.cc:1:
/usr/include/c++/7/valarray:1180:1: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::valarray&lt;_Tp&gt;&amp;, const _Tp&amp;)
 _DEFINE_BINARY_OPERATOR(&lt;&lt;, __shift_left)
 ^
/usr/include/c++/7/valarray:1180:1: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘const std::valarray&lt;_Tp&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95:0,
                 from Main.cc:1:
/usr/include/c++/7/valarray:1180:1: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::valarray&lt;_Tp&gt;&amp;, const std::valarray&lt;_Tp&gt;&amp;)
 _DEFINE_BINARY_OPERATOR(&lt;&lt;, __shift_left)
 ^
/usr/include/c++/7/valarray:1180:1: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘const std::valarray&lt;_Tp&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from Main.cc:1:
/usr/include/c++/7/bits/valarray_after.h:410:5: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::valarray&amp;, const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;&amp;)
     _DEFINE_EXPR_BINARY_OPERATOR(&lt;&lt;, __shift_left)
     ^
/usr/include/c++/7/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   mismatched types ‘const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;’ and ‘int’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from Main.cc:1:
/usr/include/c++/7/bits/valarray_after.h:410:5: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;&amp;, const std::valarray&amp;)
     _DEFINE_EXPR_BINARY_OPERATOR(&lt;&lt;, __shift_left)
     ^
/usr/include/c++/7/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from Main.cc:1:
/usr/include/c++/7/bits/valarray_after.h:410:5: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const typename _Dom::value_type&amp;, const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;&amp;)
     _DEFINE_EXPR_BINARY_OPERATOR(&lt;&lt;, __shift_left)
     ^
/usr/include/c++/7/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   mismatched types ‘const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;’ and ‘int’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from Main.cc:1:
/usr/include/c++/7/bits/valarray_after.h:410:5: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;&amp;, const typename _Dom::value_type&amp;)
     _DEFINE_EXPR_BINARY_OPERATOR(&lt;&lt;, __shift_left)
     ^
/usr/include/c++/7/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/valarray:592:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:95,
                 from Main.cc:1:
/usr/include/c++/7/bits/valarray_after.h:410:5: note: candidate: template std::_Expr, typename std::__fun::result_type&gt; std::operator&lt;&lt;(const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;&amp;, const std::_Expr&lt;_Dom2, typename _Dom2::value_type&gt;&amp;)
     _DEFINE_EXPR_BINARY_OPERATOR(&lt;&lt;, __shift_left)
     ^
/usr/include/c++/7/bits/valarray_after.h:410:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘const std::_Expr&lt;_Dom1, typename _Dom1::value_type&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/c++/7/memory:81:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:82,
                 from Main.cc:1:
/usr/include/c++/7/bits/shared_ptr.h:66:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, const std::__shared_ptr&lt;_Tp, _Lp&gt;&amp;)
     operator&lt;&lt;(std::basic_ostream&lt;_Ch, _Tr&gt;&amp; __os,
     ^~~~~~~~
/usr/include/c++/7/bits/shared_ptr.h:66:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
     cin &lt;&lt; m &lt;&lt; n;
            ^
In file included from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:72:0,
                 from Main.cc:1:
/usr/include/c++/7/iomanip:363:5: note: candidate: template std::basic_ostream&lt;_CharT, _Traits&gt;&amp; std::operator&lt;&lt;(std::basic_ostream&lt;_CharT, _Traits&gt;&amp;, std::_Put_time&lt;_CharT&gt;)
     operator&lt;&lt;(basic_ostream&lt;_CharT, _Traits&gt;&amp; __os, _Put_time&lt;_CharT&gt; __f)
     ^~~~~~~~
/usr/include/c++/7/iomanip:363:5: note:   template argument deduction/substitution failed:
Main.cc:5:12: note:   ‘std::istream {aka std::basic_istream}’ is not derived from ‘std::basic_ostream&lt;_CharT, _Traits&gt;’
</pre>
            </div>

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