Help with Forest Gathering

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1

Problem Link: FORESTGA Problem - CodeChef
My Code:

#include <bits/stdc++.h>
using namespace std;

#define FASTIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using ll = long long;
using lld = long double;

const int MOD = 1e9+7;
const ll INF = 1e18;
const int MAXN = 1e5+5;

int n; 
double w, l, r[MAXN], h[MAXN];

bool check(double x) {
    double total = 0;
    for(int i=0; i<n; i++) {
        double height = h[i]+r[i]*x;
        if(height >= l) total += height;
        if(total >= w) return true;
    }
    return false;
}

int main() {
    FASTIO

    cin >> n >> w >> l;
    for(int i=0; i<n; i++) {
        cin >> h[i] >> r[i];
    }
    
    ll low = 0, high = 1e18+5, ans = 0;
    for(int i=0; i<=150; i++) {
        ll mid = low+(high-low)/2;
        if(check((double) mid)) {
            ans = mid;
            high = mid;
        }
        else {
            low = mid;
        }
    }
    cout << ans << "\n";

    return 0;
}

The problem is that I am getting a WA in 15th task of 2nd subtask. Can anybody please help me?

2

Try using long long instead of double, my solution was almost the same as you, but I used long long and it passed.

1 Like
3

Alright. I’ll try that.
Update: Using long long instead of double worked.