标签:pre struct cpp cond div using max tail tps
题目链接:http://poj.org/problem?id=3614
题意:
有C个奶牛去晒太阳 (1 <=C <= 2500),每个奶牛各自能够忍受的阳光强度有一个最小值和一个最大值,太大就晒伤了,太小奶牛没感觉。
给出了L种防晒霜及每种每种防晒霜的防晒指数,每个奶牛只能抹一瓶防晒霜,最后问能够享受晒太阳的奶牛有几个。
Output: A single line with an integer that is the maximum number of cows that can be protected while tanning.
思路:
应该是一道优先队列的题,下列给出两种解答形式:
1. 不用优先队列:
#include <cstdio> #include <cstring> #include <algorithm> #include <iostream> #define MAX_N 2505 using namespace std; typedef long long ll; int C,L; struct node { int minspf; int maxspf; }cow[MAX_N]; struct sums { int spf; int num; }sun[MAX_N]; bool cmp(node m,node n){ return m.maxspf==n.maxspf?m.minspf<n.minspf:m.maxspf<n.maxspf; } bool cmp2(sums m,sums n){ return m.spf<n.spf; } int main(void){ while(~scanf("%d%d",&C,&L)){ for(int i=0;i<C;i++) scanf("%d%d",&cow[i].minspf,&cow[i].maxspf); for (int i=0;i<L;++i) scanf("%d%d",&sun[i].spf,&sun[i].num); sort(cow,cow+C,cmp); sort(sun,sun+L,cmp2); int ans=0; for(int i=0;i<C;i++){ for(int j=0;j<L;j++){ if(sun[j].spf>=cow[i].minspf&&sun[j].spf<=cow[i].maxspf&&sun[j].num>0) { ans++; sun[j].num--; break; } } } printf("%d\n",ans); } return 0; }
2. 用优先队列(代码源于网络)
#include <iostream> #include <algorithm> #include <cstring> #include <cstdio> #include <map> #include <vector> #include <queue> #define MAXN 2555 #define INF 1000000007 using namespace std; int C, L; typedef pair<int, int> P; priority_queue<int, vector<int>, greater<int> > q; P cow[MAXN], bot[MAXN]; int main() { scanf("%d%d", &C, &L); for(int i = 0; i < C; i++) scanf("%d%d", &cow[i].first, &cow[i].second); for(int i = 0; i < L; i++) scanf("%d%d", &bot[i].first, &bot[i].second); sort(cow, cow + C); sort(bot, bot + L); int j = 0, ans = 0; for(int i = 0; i < L; i++) { while(j < C && cow[j].first <= bot[i].first) { q.push(cow[j].second); j++; } while(!q.empty() && bot[i].second) { int x = q.top(); q.pop(); if(x < bot[i].first) continue; ans++; bot[i].second--; } } printf("%d\n", ans); return 0; } // 原文链接:https://blog.csdn.net/sdj222555/article/details/10698641
标签:pre struct cpp cond div using max tail tps
原文地址:https://www.cnblogs.com/jaszzz/p/12687053.html