1047. Student List for Course

一开始超时,感觉时间主要消耗在C++的io速度和string处理上,5个字符没必要使用string

#include<algorithm>
#include<cstdio>
#include<cstring>
#include<deque>
using namespace std;
struct node
{
    char name[5];
    node(char*p){strcpy(name,p);}
    bool operator<(const node&x)const{return strcmp(name,x.name)<0;}
};
deque<node>st[2502];
int  main()
{
    int n, m;
    scanf("%d%d",&n,&m);
    char p[5];
    int cnt,cur;
    while(n--)
    {
        scanf("%s%d",p,&cnt);
        while(cnt--)
        {
            scanf("%d",&cur);
            st[cur].push_back(node(p));
        }
    }
    for(int i=1;i<=m;++i)
    {
        if(st[i].empty())
            printf("%d 0\n",i);
        else
        {
            printf("%d %d\n",i,st[i].size());
            sort(st[i].begin(),st[i].end());
            for(node&x:st[i])
                printf("%s\n",x.name);
        }
    }
    return 0;
}


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