27 lines
350 B
C++
27 lines
350 B
C++
#include<cstdio>
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typedef long long LL;
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LL gcd(LL a,LL b)
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{
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return b==0?a:gcd(b,a%b);
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}
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int n,k,T;
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LL a,b;
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int main()
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{
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#ifdef local
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freopen("pro.in","r",stdin);
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#endif
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scanf("%d",&T);
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for(int i=1;i<=T;i++)
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{
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scanf("%d%d",&n,&k);
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b=1ll<<k;
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a=b-k-1;
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LL g=gcd(a,b);
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a/=g;
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b/=g;
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printf("Case #%d: %lld/%lld\n",i,a,b);
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}
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return 0;
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}
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