/**
* public class SVNRepo {
* public static boolean isBadVersion(int k);
* }
* you can use SVNRepo.isBadVersion(k) to judge whether
* the kth code version is bad or not.
*/
class Solution {
/**
* @param n: An integers.
* @return: An integer which is the first bad version.
*/
public int findFirstBadVersion(int n) {
// write your code here
int start = 1;
int end = n;
while (start + 1 < end) {
int mid = start + (end - start) / 2;
if (SVNRepo.isBadVersion(mid)) end = mid;
else start = mid;
}
if (SVNRepo.isBadVersion(start)) return start;
else return end;
}
}
74.first bad version
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