[BZOJ 1029]建筑抢修
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废了。
我彻底废了。
就一个贪心水体。按截止时间排序然后遍历,当前花时间能干完就干,不能的话看能不能把更劣的选择换。仅此而已。
代码:
/************************************************************** Problem: 1029 User: danihao123 Language: C++ Result: Accepted Time:396 ms Memory:2764 kb ****************************************************************/ #include <cstdio> #include <algorithm> #include <queue> using namespace std; typedef long long ll; #define REP(i,n) for(i=0;i<(n);i++) #define REP_B(i,n) for(i=1;i<=(n);i++) const int maxn=150001; struct Node{ int a,b; bool operator <(const Node& x) const{ return b<x.b; } bool operator >(const Node& x) const{ return b>x.b; } }; Node T[maxn]; priority_queue<ll> Q; int main(){ int n; register int i,ans=0; register ll cur=0; scanf("%d",&n); for(i=1;i<=n;i++) scanf("%d%d",&T[i].a,&T[i].b); sort(T+1,T+1+n); for(i=1;i<=n;i++){ if(cur+T[i].a<=T[i].b){ cur+=T[i].a; Q.push(T[i].a); }else{ if(Q.size() && Q.top()>T[i].a){ cur-=Q.top(); Q.pop(); cur+=T[i].a; Q.push(T[i].a); } } } printf("%d\n",Q.size()); return 0; }
Jul 05, 2023 08:28:30 PM
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