HDU1789贪心

Posted 2020-10-31 tennant

题目大意：给出n个作业，同时表示有n天.第一行输入表示截止时间（deadline 简称dl）第二行表示如果逾期，要扣除对应的学分。

按分数从大到小排序，如果一样，则dl小的排前面。然后遍历所以科目，如果dl这天没有被占用，则这天完成该作业。

#include <iostream>
#include <queue>
#include <algorithm>
#include<cstring>
#include<cstdio>
using namespace std;
#define MAX 1000+10

struct Sub {
    int deadline, score;
}sub[MAX];
bool is_used[MAX];

bool cmp(const Sub&a, const Sub&b) {
    if (a.score != b.score)
        return a.score > b.score;

    return a.deadline < b.deadline;
}
int main(void) {
    int t;
    int n;
    scanf("%d", &t);
    int all;
    int sum;
    while (t--) {
        all = 0;
        memset(is_used, 0, sizeof(is_used));
        sum = 0;
        scanf("%d", &n);
        int a;
        for (int i = 1; i <= n; i++) {
            scanf("%d", &a);
            sub[i].deadline = a;
        }
        for (int i = 1; i <= n; i++) {
            scanf("%d", &a);
            sub[i].score = a;
            sum += a;
        }
        sort(sub + 1, sub + 1 + n, cmp);
        for (int i = 1; i <= n; i++) {
            int day = sub[i].deadline;
            if (!is_used[day]) {
                is_used[day] = 1;
                all += sub[i].score;
            }
            else {
                while (--day) {
                    if (!is_used[day]) {
                        is_used[day] = 1;
                        all += sub[i].score;
                        break;
                    }
                }
            }
        }
        printf("%d\n", sum - all);
    }

    return 0;

}