pat1025 PAT Ranking

题意：给出pat考试每个考场的学生的准考证号，成绩，输出每个学生的准考证号，最终排名，考场，考场排名。

思路：考场排序一次，最后整体排序一次。

代码

#include 
#include 
#include 
#include 
#include 

using namespace std;

const int MAX_N = 100000;

struct Data {
    string id;
    int room;
    int grade;
    int local_rank;
    int final_rank;

    bool operator < (const Data& d) const {
        return grade > d.grade || (grade == d.grade && id < d.id);
    }
}data[MAX_N];
int len;

int N, K;

int main() {
    // freopen("in.txt", "r", stdin);
    // freopen("out.txt", "w", stdout);
    cin >> N; len = 0;
    int p = 0;
    for (int i = 1; i <= N; i++) {
        scanf("%d", &K);
        for (int j = 0; j < K; j++) {
            cin >> data[len].id >> data[len].grade;
            data[len].room = i;
            len++;
        }
        sort(data+p, data+len);
        int r = 0, cnt = 1, gr = -1;
        for (int j = p; j < len; j++) {
            if (data[j].grade == gr) {
                cnt++; data[j].local_rank = r;
            } else {
                r += cnt;
                cnt = 1;
                data[j].local_rank = r; 
                gr = data[j].grade;
            }
        }
        p = len;
    }
    sort(data, data+len);
    int r = 0, cnt = 1, gr = -1;
    for (int j = 0; j < len; j++) {
        if (data[j].grade == gr) {
            cnt++; data[j].final_rank = r;
        } else {
            r += cnt;
            cnt = 1;
            data[j].final_rank = r; 
            gr = data[j].grade;
        }
    }
    cout << len << endl;
    for (int i = 0; i < len; i++) {
        cout << data[i].id << " " << data[i].final_rank << " " << data[i].room << " " << data[i].local_rank << endl;
    }
    return 0;
}