First Bad Version

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/* The isBadVersion API is defined in the parent class VersionControl.      boolean isBadVersion(int version); */public class Solution extends VersionControl {    public int firstBadVersion(int n) {        if (n < 1) {return 0;}int start = 1, end = n;while (start + 1 < end) {int mid = start + (end - start) / 2;if (isBadVersion(mid)) {end = mid;} else {start = mid;}}if (isBadVersion(start)) {return start;} else {return end;}    }}

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