first_bad_version
first_bad_version.go 源码
package leetcode
// 第一个错误的版本
/**
* Forward declaration of isBadVersion API.
* @param version your guess about first bad version
* @return true if current version is bad
* false if current version is good
*/
// 由系统提供实现
func isBadVersion(version int) bool {
return false
}
func firstBadVersion(n int) int {
low, high := 1, n
for low <= high {
mid := low + (high-low)/2
if isBadVersion(mid) {
if mid == low || !isBadVersion(mid-1) {
return mid
}
high = mid - 1
} else {
low = mid + 1
}
}
return high
}
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