Add More Zero
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There is a youngster known for amateur propositions concerning several mathematical hard problems.
Nowadays, he is preparing a thought-provoking problem on a specific type of supercomputer which has ability to support calculations of integers between0 0 and (2m−1) (2m−1) (inclusive).
As a young man born with ten fingers, he loves the powers of10 10 so much, which results in his eccentricity that he always ranges integers he would like to use from 1 1 to 10k 10k (inclusive).
For the sake of processing, all integers he would use possibly in this interesting problem ought to be as computable as this supercomputer could.
Given the positive integerm m, your task is to determine maximum possible integer k kthat is suitable for the specific supercomputer.
Nowadays, he is preparing a thought-provoking problem on a specific type of supercomputer which has ability to support calculations of integers between
As a young man born with ten fingers, he loves the powers of
For the sake of processing, all integers he would use possibly in this interesting problem ought to be as computable as this supercomputer could.
Given the positive integer
164
Case #1: 0Case #2: 19
题意:输入一个数m,求0到2^m-1范围内,使得10^k最大,求k
思路:10^k<=2^m-1 10^k<2^m 取对数 log10^k<log2^m k<m*log2/log10 k<m*log10(2)
#include <cstdio>#include <cmath>#include <algorithm>using namespace std;const double IP=0.30102999566398;int main(){ int n,m,cas=1; while(~scanf("%d",&n)) { int m=(int)(n*IP); printf("Case #%d: %d\n",cas++,m); } return 0;}
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