codeforces 107B Basketball Team
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做法:如果当初英语阅读仔细一点就好了,类似于高中的时候常做的,在一个箱子里摸n个球
#include<cstdio>int main(){ int n,m,h,rest=0,us=0; double ans=1; scanf("%d%d%d",&n,&m,&h); for(int i=0;i<m;i++) { int x; scanf("%d",&x); rest+=x; if(i==h-1)us=x; } if(rest<n) { printf("-1\n"); return 0; } n--;us--;rest--; while(n>0) { ans*=1.0*(rest-us)/rest; if(us==rest)break; rest--; n--; } printf("%.15lf\n",1-ans); return 0;}
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