SDNU 1170.津津的储蓄计划

#include <cstdio>
#include <iostream>
#include <string>
#include <cstring>
#include <algorithm>
#include <queue>

using namespace std;

int main()
{
    int storage[18], month = 0, i;
    int sum = 0, s = 0;
    for(i = 0; i<12; i++)
    {
        scanf("%d", &storage[i]);
    }
    for(i = 0; i<12; i++)
    {
        sum += (300-storage[i]);
//        printf("i = %d, sum = %d\n", i, sum);
        if(sum > 0)
            while(sum)
            {
                if(sum >= 100)
                {
                    sum -= 100;
//                    printf("sum = %d, ",sum);
                    s += 100;
//                    printf("s = %d\n", s);
                    if(sum == 0)month++;
                }
                else if(sum<100 && sum >= 0)
                {
                    month++;
                    break;
                }
            }
        else if(sum == 0)month++;
        else if(sum<0)
        {
            printf("-%d\n", ++month);
            break;
        }
    }
    if(i == 12)
    {
        s = s+s*0.2+sum;
        printf("%d\n", s);
    }
    return 0;
}