运行 ID: 41654

Main.cc: In function ‘long long int fib(int)’:
Main.cc:8:14: error: ‘retrun’ was not declared in this scope
  if(a[n]!=0) retrun a[n];
              ^~~~~~
Main.cc:8:14: note: suggested alternative: ‘setbuf’
  if(a[n]!=0) retrun a[n];
              ^~~~~~
              setbuf