From d2ad6fb2c42d4b6f602404ab9ea635d029722f79 Mon Sep 17 00:00:00 2001
From: Cool <747682928@qq.com>
Date: Sun, 10 Nov 2024 17:12:02 +0800
Subject: [PATCH] =?UTF-8?q?2024/11/10=20=E7=81=B5=E8=8C=B6=E9=A2=98?=
 =?UTF-8?q?=E5=8D=95=20=E4=BA=8C=E5=88=86=E6=9F=A5=E6=89=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../ling_cha_mount/binary_search/Num34.java   | 31 +++++++++++++++++++
 .../ling_cha_mount/binary_search/Num704.java  | 24 ++++++++++++++
 2 files changed, 55 insertions(+)
 create mode 100644 src/main/java/com/cool/ling_cha_mount/binary_search/Num34.java
 create mode 100644 src/main/java/com/cool/ling_cha_mount/binary_search/Num704.java

diff --git a/src/main/java/com/cool/ling_cha_mount/binary_search/Num34.java b/src/main/java/com/cool/ling_cha_mount/binary_search/Num34.java
new file mode 100644
index 0000000..9655661
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/binary_search/Num34.java
@@ -0,0 +1,31 @@
+package com.cool.ling_cha_mount.binary_search;
+
+/**
+ * @author : Cool
+ * @date: 2024/11/08
+ * 34. 在排序数组中查找元素的第一个和最后一个位置
+ */
+public class Num34 {
+    public int[] searchRange(int[] nums, int target) {
+        int start = binarySearch(nums, target);
+        if (start < nums.length && nums[start] == target) {
+            int end = binarySearch(nums, target + 1) - 1;
+            return new int[]{start, end};
+        }
+        return new int[]{-1, -1};
+    }
+
+    public int binarySearch(int[] nums, int target) {
+        int left = 0;
+        int right = nums.length - 1;
+        while (left <= right) {
+            int mid = (right - left) / 2 + left;
+            if (nums[mid] < target) {
+                left = mid + 1;
+            } else {
+                right = mid - 1;
+            }
+        }
+        return left;
+    }
+}
diff --git a/src/main/java/com/cool/ling_cha_mount/binary_search/Num704.java b/src/main/java/com/cool/ling_cha_mount/binary_search/Num704.java
new file mode 100644
index 0000000..242f9b0
--- /dev/null
+++ b/src/main/java/com/cool/ling_cha_mount/binary_search/Num704.java
@@ -0,0 +1,24 @@
+package com.cool.ling_cha_mount.binary_search;
+
+/**
+ * @author : Cool
+ * @date: 2024/11/10
+ * 704. 二分查找
+ */
+public class Num704 {
+    public int search(int[] nums, int target) {
+        int left = 0;
+        int right = nums.length - 1;
+        while (left <= right) {
+            int mid = (right - left) / 2 + left;
+            if (nums[mid] > target) {
+                right = mid - 1;
+            } else if (nums[mid] < target) {
+                left = mid + 1;
+            } else {
+                return mid;
+            }
+        }
+        return -1;
+    }
+}