洛古P1542

#include <bits/stdc++.h>        //简单快捷包括所有头文件，推荐使用
using namespace std;

int n;
int x[200010],y[200010],s[200010];
bool f(double w){
    long double sum = 0;
    for(int i = 0; i < n; i++){
        sum += s[i]/w;
        if(sum > y[i])return false;
        if(sum < x[i])sum = x[i];
    }
    return true;
}
int main()
{
    scanf("%d",&n);
    for(int i = 0; i < n; i++){
        scanf("%d%d%d",&x[i],&y[i],&s[i]);
    }
    long double l = 0,ans = 0,r = 1e9;
    while(r-l>0.00001){
        double mid = (l+r)/2;
        if(f(mid))ans = mid,r = mid;
        else l = mid;
    }
    printf("%0.2Lf\n",ans);
    return 0;
}