codeforces 569A Music

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題目串連

歌曲下載速度ds = （q-1)/q

歌曲播放速度ps = 1

則當前已下載好s秒的情況下，歌曲播放進度追上下載進度是歌曲播放至的位置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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codeforces 569A Music