运行 ID: 127829

Main.cc: In function ‘int main()’:
Main.cc:12:5: error: ‘scanf’ was not declared in this scope
     scanf("%d%d", &n, &k);
     ^~~~~
Main.cc:29:5: error: ‘printf’ was not declared in this scope
     printf("%d\n", --left);
     ^~~~~~
Main.cc:29:5: note: suggested alternative: ‘int’
     printf("%d\n", --left);
     ^~~~~~
     int