int solve(vector<int> &input) {
    int ans = 0;
    int windowStart = 0;
    for (int windowEnd = 0; windowEnd < input.size(); windowEnd++) {
        // TODO: update variable
        while () { //TODO: check condition
            //TODO: modify bounds
            windowStart++;
        }
        //TODO: update answer
    }
    return ans;
}