POJ-1700-Crossing River
来源:互联网 发布:龙记模胚报价软件 编辑:程序博客网 时间:2024/05/22 00:55
贪心题吧,两种贪心策略,一种是最快的+最慢的,最快的回来,再最快的+次慢的,最快的回来,第二种是最快的+次快的,次快的回来,再最慢+次慢过河,在最快的回来。
代码:
#include<cstdio>#include<cstring>#include<iostream>#include<algorithm>using namespace std;const int maxn=1100;int a[maxn],n;int main(){ int T; scanf("%d",&T); while(T--) {scanf("%d",&n);for(int i=0;i<n;i++) scanf("%d",&a[i]);if(n==1){ printf("%d\n",a[0]); continue;}sort(a,a+n);int i,ans=0;for(i=n-1;i>=0;){ if(i<3)break; int ita=2*a[0]+a[i]+a[i-1]; int itb=2*a[1]+a[0]+a[i]; if(ita<itb)ans+=ita; elseans+=itb; i-=2;}if(i==2) ans+=a[0]+a[1]+a[2];else ans+=a[1];printf("%d\n",ans); } return 0;}
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