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#include <cstdio>
#include <vector>
#include <set>
using namespace std;
int main() {
    int n, m, k, temp, a, b;
    scanf("%d", &n);
    vector<set<int>> v(n);
    for(int i = 0; i < n; i++) {
        scanf("%d", &m);
        set<int> s;
        for(int j = 0; j < m; j++) {
            scanf("%d", &temp);
            s.insert(temp);
        }
        v[i] = s;
    }
    scanf("%d", &k);
    for(int i = 0; i < k; i++) {
        scanf("%d %d", &a, &b);
        int nc = 0, nt = v[b-1].size();
        for(auto it = v[a-1].begin(); it != v[a-1].end(); it++) {
            if(v[b-1].find(*it) == v[b-1].end())
                nt++;
            else
                nc++;
        }
        double ans = (double)nc / nt * 100;
        printf("%.1f%%\n", ans);
    }
    return 0;
}

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题目要求，输入N，参与排名的人数，L,参与排名的及格分数要求，H，参与排名优秀非分数要求。德与才均不低于H的成为圣人，按总分由高到低排列（will be ranked in non-increasing order according to their total grades.）才低于H,而德不低于者成为君子，德才均低于H，但德不低于才的成为愚人，剩下的称为小人，按照圣人君子愚人小人排列，同一种人按照总分非递增排列。

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#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
struct node {
    int num, de, cai;
};
int cmp(struct node a, struct node b) {
    if ((a.de + a.cai) != (b.de + b.cai))
        return (a.de + a.cai) > (b.de + b.cai);
    else if (a.de != b.de)
        return a.de > b.de;
    else
        return a.num < b.num;
}
// 为什么这里是>而不是>=呢，因为总分相同，按德分，德分同，看序号。所以=的情况会下放到下一个判断语句里去。
int main() {
    int n, low, high;
    scanf("%d %d %d", &n, &low, &high);
    vector<node> v[4];
    node temp;
    int total = n;
    for (int i = 0; i < n; i++) {
        scanf("%d %d %d", &temp.num, &temp.de, &temp.cai);
        if (temp.de < low || temp.cai < low)
            total--;
        else if (temp.de >= high && temp.cai >= high)
            v[0].push_back(temp);
        else if (temp.de >= high && temp.cai < high)
            v[1].push_back(temp);
        else if (temp.de < high && temp.cai < high && temp.de >= temp.cai)
            v[2].push_back(temp);
        else
            v[3].push_back(temp);
    }
    printf("%d\n", total);
    for (int i = 0; i < 4; i++) {
        sort(v[i].begin(), v[i].end(), cmp);
        for (int j = 0; j < v[i].size(); j++)
            printf("%d %d %d\n", v[i][j].num, v[i][j].de, v[i][j].cai);
    }
    return 0;
}

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#include <iostream>
#include <cstring> 
using namespace std;
int main() {
    int n, p = 0, q = 0;
    char a[10000], b[10000], A[10000], B[10000];
    scanf("%d%s%s", &n, a, b);
    int cnta = strlen(a), cntb = strlen(b);
    for(int i = 0; i < strlen(a); i++) {
        if(a[i] == '.') {
            cnta = i;
            break;
        }
    }
    for(int i = 0; i < strlen(b); i++) {
        if(b[i] == '.') {
            cntb = i;
            break;
        }
    }
    // cnta和cntb为a和b两个字符串的小数点下标，初始值为字符串长度
    int indexa = 0, indexb = 0;
    while(a[p] == '0' || a[p] == '.') p++;
    while(b[q] == '0' || b[q] == '.') q++;
    // p和q为非0非小数点的下标
    if(cnta >= p)
        cnta = cnta - p;
    else
        cnta = cnta - p + 1;
    if(cntb >= q)
        cntb = cntb - q;
    else
        cntb = cntb - q + 1;
    if(p == strlen(a))
        cnta = 0;
    if(q == strlen(b))
        cntb = 0;
    while(indexa < n) {
        if(a[p] != '.' && p < strlen(a))
            A[indexa++] = a[p];
        else if(p >= strlen(a))
            A[indexa++] = '0';
        p++;
    }
    while(indexb < n) {
        if(b[q] != '.' && q < strlen(b))
            B[indexb++] = b[q];
        else if(q >= strlen(b))
            B[indexb++] = '0';
        q++;
    }
    // index从0到n-1保存有效数字(有效数字不够用0补)
    // b[q] != '.'是有必要的，比如10.或则是10.1
    if(strcmp(A, B) == 0 && cnta == cntb)
        printf("YES 0.%s*10^%d", A, cnta);
    else
        printf("NO 0.%s*10^%d 0.%s*10^%d" , A, cnta, B, cntb);
    return 0;
}