AC日记——[JSOI2007]建筑抢修 bzoj 1029
思路:
贪心,而且,stl水过;
然而神特么输出que.size()就错!
代码:
#include <queue> #include <cstdio> #include <cstring> #include <iostream> #include <algorithm> using namespace std; #define maxn 150005 #define ll long long struct BuildingType { ll lit,time; }; struct BuildingType ai[maxn]; ll n,sum,ans; inline void in(ll &now) { char Cget=getchar();now=0; while(Cget>'9'||Cget<'0') Cget=getchar(); while(Cget>='0'&&Cget<='9') { now=now*10+Cget-'0'; Cget=getchar(); } } bool cmp(BuildingType aa,BuildingType bb) { if(aa.lit==bb.lit) return aa.time<bb.time; else return aa.lit<bb.lit; } priority_queue<ll>que; int main() { in(n); for(ll i=1;i<=n;i++) in(ai[i].time),in(ai[i].lit); sort(ai+1,ai+n+1,cmp); for(ll i=1;i<=n;i++) { if(sum+ai[i].time<=ai[i].lit) que.push(ai[i].time),sum+=ai[i].time,ans++; else { if(que.empty()) continue; if(ai[i].time<que.top()) sum-=que.top(),que.pop(),que.push(ai[i].time),sum+=ai[i].time; } } printf("%lld\n",ans); return 0; }