1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
#include <iostream>

using namespace std;

int main(){

    ios_base::sync_with_stdio(false);

    int n, k;
    int result = 2020;
    cin >> n >> k;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= i; j++){
            int year;
            cin >> year;
            if ( (i+1)*i - (j-1)*j - (i-j)*(i-j+1) <= 2*k && year < result)
                result = year;
        }
    }

    cout<<result;

    return 0;
}