运行 ID: 31693

Main.cc: In function ‘int main()’:
Main.cc:8:12: error: ‘l’ was not declared in this scope
  for(int i=l;i<=r;i++){
            ^
Main.cc:8:17: error: ‘r’ was not declared in this scope
  for(int i=l;i<=r;i++){
                 ^
Main.cc:15:3: error: ‘sum’ was not declared in this scope
   sum=0;
   ^~~
Main.cc:15:3: note: suggested alternative: ‘sun’
   sum=0;
   ^~~
   sun