codeforces 569A Music

题目连接

歌曲下载速度ds = （q-1)/q

歌曲播放速度ps = 1

则当前已下载好s秒的情况下，歌曲播放进度追上下载进度是歌曲播放到的位置pp = s / (ps - ds) = s * (1 - (q-1)/q) = s*q;

code:

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;

int main()
{
int T,startPlayTime,q;
int downSpeed;
int playSpeed = 1;
int dx;
while(cin >> T >> startPlayTime >> q){
int cnt = 0;
dx = startPlayTime ;
while(dx < T){
dx = dx * q;
cnt ++;
}
cout << cnt << endl;
}
return 0;
}

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