求教 leetcode 374， Java 解

public int guessNumber(int n) { int min = 1, max = n; while (min <= max) { // int mid = (min + max) / 2; 会超时 int mid = min+(max-min ) / 2;//不超时 int guess = guess(mid); if (guess == 1) { min = mid + 1; } else if (guess == -1) { max = mid - 1; } else { return mid; } } return min; } 

请问为什么一个超时一个不超时