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a month ago
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#include <iostream> using namespace std; int n, k; int a[100005]; int dem = 0; int main() { cin >> n >> k; for(int i = 1; i <= n; i++) { cin >> a[i]; } if(n % k != 0) cout << "NO"; else { for(int i = 1; i <= n; i++) for(int j = i + n/k; j <= n; j += n/k) if(a[i] != a[j]) { dem++; } if(dem != 0) cout << "NO"; else cout << "YES"; } }
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