1243A - Maximum Square - CodeForces Solution


implementation *800

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C++ Code:

/*
ॐ त्र्यम्बकं यजामहे सुगन्धिं पुष्टिवर्धनम् ।
उर्वारुकमिव बन्धनान् मृत्योर्मुक्षीय मामृतात् ॥ */

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

int main()
{
    int t;
    cin >> t;
    while (t--)
    {
        int n;
        cin >> n;
        int arr[n];
        map<int, int> um;
        for (int i = 0; i < n; i++)
        {
            cin >> arr[i];
        }
        for (int i = 0; i < n; i++)
        {
            while (arr[i] >= 1)
            {
                um[arr[i]]++;
                arr[i]--;
            }
        }
        for (int i = n; i >= 1; i--)
        {
            if (um[i] >= i)
            {
                cout << i << endl;
                break;
            }
        }
    }

    return 0;
}


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