C++ :

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

int main() {
	int a[100001];
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	a[n + 1] = -1;
	int cnt = 1, ans = 0;
	for (int j = 2; j <= n + 1; j++) {
		if (a[j - 1] == a[j]) {
			cnt++;
		} else {
			ans = max(ans, cnt);
			cnt = 1;
		}
	}
	cout << ans;
	return 0;
}