maximo.cpp

#include <bits/stdc++.h>

using namespace std;

const int maxn = 100010;
const int inf = 0x3f3f3f3f;

int v[maxn];

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(0);
	
	int n, k;
	cin >> n >> k;

	for (int i = 1; i <= n; i++) cin >> v[i];

	int res;
	if (k == 1) {

		res = inf;
		for (int i = 1; i <= n; i++) res = min(res, v[i]);
	
	} else if (k == 2) {

		res = max(v[1], v[n]);
	
	} else {

		res = -inf;
		for (int i = 1; i <= n; i++) res = max(res, v[i]);
	}

	cout << res << "\n";

	return 0;
}