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程式語言 - LeetCode - C++ - 401. Binary Watch

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題目：


解答：

class Solution {
public:
    vector<string> readBinaryWatch(int turnedOn) {
        auto bits = [](int v) {
            int ans = 0;

            for (int i = 0; i < 6; ++i) {
                ans += (v & 1);
                v >>= 1;
            }

            return ans;
        };

        vector<string> ans;

        for (int h = 0; h < 12; ++h) {
            for (int m = 0; m < 60; ++m) {
                if (bits(h) + bits(m) == turnedOn) {
                    string t = to_string(h) + ":";

                    if (m < 10) {
                        t += "0";
                    }
                    t += to_string(m);
                    ans.push_back(t);
                }
            }
        }

        return ans;
    }
};