PAT (Advanced Level) 1047. Student List for Course (25)

简单题。

#include<iostream>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<cstdio>
#include<map>
#include<queue>
#include<string>
#include<vector>
using namespace std;

const int maxn=40000+10;

struct X
{
    char name[6];
    vector<int>v;
}s[maxn];

struct Ans
{
    vector<int>v;
}ans[maxn];

bool cmp1(const X&a,const X&b)
{
    return strcmp(a.name,b.name)<0;
}

int n,m;

int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
    {
        scanf("%s",s[i].name);
        int num; scanf("%d",&num);
        while(num--)
        {
            int id; scanf("%d",&id);
            s[i].v.push_back(id);
        }
    }

    sort(s+1,s+1+n,cmp1);

    for(int i=1;i<=n;i++)
        for(int j=0;j<s[i].v.size();j++)
            ans[s[i].v[j]].v.push_back(i);

    for(int i=1;i<=m;i++)
    {
        printf("%d %d\n",i,ans[i].v.size());
        for(int j=0;j<ans[i].v.size();j++)
            printf("%s\n",s[ans[i].v[j]].name);
    }
    return 0;
}