Establish equality

// ~/.vim/cpp_template.cpp
#include <bits/stdc++.h>
#include <iostream>
#include <vector>
#include <algorithm>

#define REP(i,a,b) for (int i = a; i < b; i++)


using namespace std;

bool ok(long long k, int n, long long* bot){
    long long counter = 0;
    REP(j, 0, n){
        if(bot[j] > k){
            counter += (bot[j] - k)/2;
        }else{
            counter -= k - bot[j];
        }
    }
    return counter >= 0;
}


int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    // Your code starts here

    int n;
    cin >> n;

    long long bot[n];
    long long mx = 0;
    REP(i, 0, n){
        cin >> bot[i];
        mx = max(bot[i], mx);
    }

    long long x = -1;
    for(int b = mx; b >=1; b/=2){
        while(ok(x+b, n, bot)) x+= b;
    }
    cout << x << endl;

    
    
    return 0;
}

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Test 55

Verdict: ACCEPTED