leetcode - 35. Search Insert Position - Easy

descrition

Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in order.

You may assume no duplicates in the array.

Example 1:

Input: [1,3,5,6], 5

Output: 2

Example 2:

Input: [1,3,5,6], 2

Output: 1

Example 3:

Input: [1,3,5,6], 7

Output: 4

Example 1:

Input: [1,3,5,6], 0

Output: 0

解析

二分查找的实现。

code

#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

class Solution{

public:

	int searchInsert(vector<int>& nums, int target){

		int ileft = 0, iright = nums.size() - 1;

		while(ileft <= iright){

			int imid = ileft + (iright - ileft) / 2;

			if(nums[imid] == target)

				return imid;

			else if (nums[imid] < target){

				ileft = imid + 1;

			}else{

				// nums[imid] > target

				iright = imid - 1;

			}

		}

		return ileft;

	}

};

int main()

{

	return 0;

}