运行 ID: 41780

Main.cc: In function ‘int main()’:
Main.cc:23:22: error: ‘flag’ was not declared in this scope
   else if(a[i]=='r'&&flag) sum+=c;
                      ^~~~
Main.cc:23:22: note: suggested alternative: ‘log’
   else if(a[i]=='r'&&flag) sum+=c;
                      ^~~~
                      log