Leetcode 401 Solution

This article provides solution to leetcode question 401 (binary-watch)
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https://leetcode.com/problems/binary-watch

Solution

class Solution {
public:
    vector<string> readBinaryWatch(int num) {
        vector<string> res;

        for (int h = 0; h < 12; h++)
        {
            for (int m = 0; m < 60; m++)
            {
                if (bitset<10>((h << 6) + m).count() == num)
                {
                    res.push_back(to_string(h) + ":" + (m < 10 ? "0" + to_string(m) : to_string(m)));
                }
            }
        }

        return res;
    }
};