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程式語言 - LeetCode - CPP - 278. First Bad Version

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題目：


解答：

// The API isBadVersion is defined for you.
// bool isBadVersion(int version);

class Solution {
public:
    int firstBadVersion(int n) {
        int l = 1;
        int r = n;

        while (l < r) {
            int m = l + ((r - l) >> 1);

            if (isBadVersion(m)) {
                r = m;
            }
            else {
                l = m + 1;
            }
        }

        return l;
    }
};