# 35.Search-Insert-Position

## 35. Search Insert Position

## 题目地址

<http://www.lintcode.com/problem/search-insert-position/description>

<https://www.jiuzhang.com/solutions/search-insert-position/>

## 题目描述

```
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
[1,3,5,6], 5 → 2

[1,3,5,6], 2 → 1

[1,3,5,6], 7 → 4

[1,3,5,6], 0 → 0

Challenge
O(log(n)) time
```

## 代码

Appraoch 1: Find the first position

```java
public class Solution {
    public int searchInsert(int[] A, int target) {
    if (A == null | A.length == 0) return 0;

    int start = 0;
    int end = A.length - 1;

    while (start + 1 < end) {
      int mid = start + (end - start) / 2;
      if (A[mind] == target) {
        return mid;
      } else if (A[mid] < target) {
        start = mid;
      } else {
        end = mid;
      }
    }

    if (A[start] >= target) {
      return start;
    } else if (A[end] >= target) {
      return end;
    } else {
      return end + 1;
    }

    /// approach 2:
    if (target < A[0]) return 0;

    if (A[end] == target) return end;
    if (A[start] == target) return start;
    if (A[end] < target)    return end + 1;

    return start + 1;

  }

}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://wentao-shao.gitbook.io/leetcode/binary-search/35.search-insert-position.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.