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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) {
        int left = 1;
        int right = n;
        
        while(left < right) {
            int mid = left + (right - left) / 2;
            if(isBadVersion(mid))
                right = mid;
            else 
                left = mid + 1;
        }
        
        return left;
    }
}