【每日编程06】二分法

题目1：搜索插入位置

class Solution {
    public int searchInsert(int[] nums, int target) {
        int left = 0, right = nums.length - 1;
        while(left <= right){
            int mid = left + (right - left) / 2;
            if(nums[mid] == target){
                return mid;
            }else if(nums[mid] > target){
                right = mid - 1;
            }else{
                left = mid + 1;
            }
        }
        return left;
    }
}

题目2：第一个错误的版本

public class Solution extends VersionControl {
    public int firstBadVersion(int n) {
        int left = 1, right = n;
        while(left <= right){
            int mid = left + (right - left) / 2;
            if(isBadVersion(mid)){
                right = mid - 1;
            }else{
                left = mid + 1;
            }
        }
        return left;
    }
}