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HDU 4883 TIANKENG’s restaurant
题目链接
题意:给定一些时间作为区间,和一个人数,问要安排多少人去看管(一个人只能看管一个人)
思路:普通的区间选点问题,一个区间拆成一个进入点一个出去点,然后排序循环求答案即可
代码:
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;const int N = 20005;
struct Man {int v, t;Man() {}Man(int v, int t) {this->v = v; this->t = t;}
} m[N];bool cmp(Man a, Man b) {if (a.t != b.t)return a.t < b.t;return a.v < b.v;
}int n, t, mn;int main() {scanf("%d", &t);while (t--) {mn = 0;scanf("%d", &n);for (int i = 0; i < n; i++) {int a, b, c, d, e;scanf("%d%d:%d%d:%d", &a, &b, &c, &d, &e);int t1 = b * 60 + c;int t2 = d * 60 + e;m[mn++] = Man(a, t1);m[mn++] = Man(-a, t2);}sort(m, m + mn, cmp);int ans = 0, sum = 0;for (int i = 0; i < mn; i++) {sum += m[i].v;ans = max(ans, sum);}printf("%d\n", ans);}return 0;
}
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