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| // @Title: 第一个错误的版本 (First Bad Version)
// @Author: 15816537946@163.com
// @Date: 2019-11-18 12:20:48
// @Runtime: 12 ms
// @Memory: 32.3 MB
/* 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-1;
} else {
left = mid + 1;
}
}
return left;
}
}
|