【Link】:

【Description】



让你求最大的k;

使得

10^k<=2^m-1

【Solution】



求出2^m-1的位数就好;

[lg(2^m-1)] = lg(2^m) = m*lg2



【NumberOf WA】



1(没加case)



【Reviw】

【Code】

#include <bits/stdc++.h>
using namespace std; int n; int main(){
int kk = 0;
while (~scanf("%d",&n)){
kk++;
int temp = n*log10(2);
printf("Case #%d: %d\n",kk,temp);
}
return 0;
}

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