HDU 5240 Exam

The 2015 ACM-ICPC China Shanghai Metropolitan Programming Contest

2015ACM-ICPC上海大都会赛 签到题

#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
using namespace std;

const int maxn=100000+10;
struct Exam
{
    int r,e,l;
    int Start,End;
}E[maxn];
int T,n;

bool cmp(const Exam&a,const Exam&b)
{
    return a.e<b.e;
}
int main()
{
    scanf("%d",&T);
    for(int t=1;t<=T;t++)
    {
        scanf("%d",&n);
        for(int i=0;i<n;i++)
        {
            scanf("%d%d%d",&E[i].r,&E[i].e,&E[i].l);
            E[i].Start=E[i].e; //考试开始时间
            E[i].End=E[i].e+E[i].l; //考试结束时间
        }
        sort(E,E+n,cmp);

        int preEnd=0;
        int k=0;
        int ans=0;
        for(int i=0;i<n;i++)
        {
            int Len=E[i].Start-preEnd;

            while(Len)
            {
                int Min=min(E[k].r,Len);
                E[k].r=E[k].r-Min;
                Len=Len-Min;
                if(E[k].r==0) k++;
            }

            if(E[i].r!=0) {ans=1; break;}
            preEnd=E[i].End;
        }
        printf("Case #%d: ",t);
        if(ans) printf("NO\n");
        else printf("YES\n");
    }
    return 0;
}