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FirstBadVersion.java

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public class FirstBadVersion {

public int firstBadVersion(int n) {

int left = 1, right = n, mid;

while (left <= right) {

mid = left + (right - left) / 2;

if (isBadVersion(mid) && !isBadVersion(mid - 1)) return mid;

else if (!isBadVersion(mid)) right = mid - 1;

else left = mid + 1;

}

return left;

}

// implemented by leetcode (just reference here)

private static boolean isBadVersion(int version) {

return false;

}

}