視頻鏈接：

https://www.bilibili.com/video/BV12D4y177W3/?spm_id_from=333.999.0.0&;;vd_source=84178e8152d31e2c9e148f652d7d44b2?

源碼

#include<iostream>

#include<cmath>

#include<cstdio>

using namespace std;

int main(){

double n,x,y,t,r;

cin>>n>>x>>y;

t=n-ceil(y/x);

r=t>=0?t:0;

cout<<r;

return 0;

}