概率(多边形,uva 11971)
2016-10-03 22:58
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#include<bits/stdc++.h> using namespace std; typedef long long ll; ll mypow(ll x,ll n) { ll ret=1; while(n) { if(n&1) ret*=x; x*=x; n>>=1; } return ret; } ll gcd(ll a,ll b) { return a%b==0?b:gcd(b,a%b); } int main() { ll T; scanf("%lld",&T); for(ll t=1;t<=T;t++) { printf("Case #%lld: ",t); ll K; scanf("%lld %lld",&K,&K); if(K==1) puts("0/1"); else { ll fz=K+1; ll fm=mypow(2,K); ll GCD=gcd(fm,fz); fz/=GCD; fm/=GCD; printf("%lld/%lld\n",fm-fz,fm); } } return 0; }
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