评测机一定有问题!! 我本地用Vijos的测试数据和expected output完全相同, 结果提交了之后就WA.

代码如下:

#include <iostream>

int main() {
    const int NUMBER_OF_MONTHS = 12;
    int expenses[NUMBER_OF_MONTHS] = {0};
    
    // Input 
    for ( int i = 0; i < NUMBER_OF_MONTHS; ++ i ) {
        std::cin >> expenses[i];
    }

    // Processing
    int balance = 0, deposit = 0, month = 0;
    for ( ; month < NUMBER_OF_MONTHS && balance >= 0; ++ month ) {
        balance += 300;
        balance -= expenses[month];

        while ( balance > 100 ) {
            deposit += 100;
            balance -= 100;
        }
    }
    
    // Output
    if ( balance > 0 ) {
        balance += deposit * 1.2;
        std::cout << balance << std::endl;
    } else {
        std::cout << -month << std::endl;
    }

    return 0;
}

管理组敢不敢自己跑一遍看看, 我的输出和预期输出哪里不一样了~