//Picking Numbers #include #include using namespace std; int main() { int n; cin >> n; vector arr(n); for(int i = 0; i < n; i++) cin >> arr[i]; for(int i = 0; i < n; i++) for(int j = 0; j < n - 1; j++) { if(arr[j] > arr[j+1]) { int temp = arr[j]; arr[j] = arr[j+1]; arr[j+1] = temp; } } int way = 1, longest = 0; for(int i = 0; i < n; i++) { way = 1; for(int j = i+1; j < n; j++) { if(arr[j] - arr[i] <= 1) way++; } if(way > longest) longest = way; } cout << longest; return 0; }