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