20pts求助！

WhyRE？

#include<bits/stdc++.h>
using namespace std;
int n;
int a[50000];
int jsyear,jsmonth,jsday,jshour,jsmin;
int nowyear,nowmonth,nowday,nowhour,nowmin;
bool check(int x){
    if(((x%4==0&&x%100!=0)||x%400==0))
        return 1;
    else 
        return 0;
}
int main(){
    scanf("%d",&n);
    for(int i=1;i<=n;i++)
        scanf("%d",&a[i]);
    scanf("%d-%d-%d-%d:%d",&nowyear,&nowmonth,&nowday,&nowhour,&nowmin);
    scanf("%d-%d-%d-%d:%d",&jsyear,&jsmonth,&jsday,&jshour,&jsmin);
    sort(a+1,a+1+n);
    int i=1,sum=0;
    while(1){
        sum++;
        nowmin+=a[i];
        if(nowmin>=60){
            nowmin%=60;
            nowhour++;
        }
        if(nowhour>=24){
            nowhour%=24;
            nowday++;
        }
        if((nowmonth==1||nowmonth==3||nowmonth==5||nowmonth==7||nowmonth==8||nowmonth==10||nowmonth==12)&&nowday>=31){
            nowday%=31;
            nowmonth++;
        }
        if((nowmonth==4||nowmonth==6||nowmonth==9||nowmonth==10)&&nowday>=30){
            nowday%=30;
            nowmonth++;
        }
        if(nowmonth==2&&check(nowyear)&&nowday>=29){
            nowday%=29;
            nowmonth++;
        }
        if(nowmonth==2&&!check(nowyear)&&nowday>=28){
            nowday%=28;
            nowmonth++;
        }
        if(nowmonth>=12){
            nowmonth%=12;
            nowyear++;
        }
        if(nowyear>=jsyear&&nowmonth>=jsmonth&&nowday>=jsday&&nowhour>=jshour&&nowmin>=jsmin)
            break;
        i++;
    }
    cout<<sum;
    return 0;
}