hdu_5810_Balls and Boxes(打表推公式)
2016-08-09 18:13
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题意:
如题,让你求那个公式的期望
题解:
打表找规律,然后推公式。这项技能必须得学会
#include<cstdio> #include<algorithm> using namespace std; int main() { long long n,m,g; while(~scanf("%I64d%I64d",&n,&m)&&n+m) { n=n*(m-1); m=m*m; g=__gcd(n,m); printf("%I64d/%I64d\n",n/g,m/g); } }View Code
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