运行 ID: 71731

Main.cc: In function ‘int main()’:
Main.cc:9:25: error: ‘N’ was not declared in this scope
     for (int i = 0; i < N; i++) {
                         ^
Main.cc:15:18: error: ‘N’ was not declared in this scope
     for (int i = N-1; i >=0; i=i-1) {
                  ^