1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
#include <bits/stdc++.h>

using namespace std;

constexpr int INF = 1000000000;

int n, k;

int main(){
    ios_base::sync_with_stdio(0);
	cin.tie(0);
    cout.tie(0);

    cin>> n >> k;
    int ans = INF;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=i; j++){
            int year;
            cin>> year;
            //cout<< year << " => " << j * (i-j+1) << '\n';
            if((j * (i-j+1)) <= k) ans = min(ans, year);
        }
    }
    cout<< ans;

    return 0;
}