diff --git a/codes/csharp/chapter_computational_complexity/time_complexity.cs b/codes/csharp/chapter_computational_complexity/time_complexity.cs
index 44c2f6a7e..42e51ce02 100644
--- a/codes/csharp/chapter_computational_complexity/time_complexity.cs
+++ b/codes/csharp/chapter_computational_complexity/time_complexity.cs
@@ -134,8 +134,7 @@ public class time_complexity {
     /* 线性对数阶 */
     static int LinearLogRecur(float n) {
         if (n <= 1) return 1;
-        int count = LinearLogRecur(n / 2) +
-                    LinearLogRecur(n / 2);
+        int count = LinearLogRecur(n / 2) + LinearLogRecur(n / 2);
         for (int i = 0; i < n; i++) {
             count++;
         }
diff --git a/codes/csharp/chapter_computational_complexity/worst_best_time_complexity.cs b/codes/csharp/chapter_computational_complexity/worst_best_time_complexity.cs
index 0656f64b2..bdf86ce1b 100644
--- a/codes/csharp/chapter_computational_complexity/worst_best_time_complexity.cs
+++ b/codes/csharp/chapter_computational_complexity/worst_best_time_complexity.cs
@@ -17,11 +17,8 @@ public class worst_best_time_complexity {
 
         // 随机打乱数组元素
         for (int i = 0; i < nums.Length; i++) {
-            var index = new Random().Next(i, nums.Length);
-            var tmp = nums[i];
-            var ran = nums[index];
-            nums[i] = ran;
-            nums[index] = tmp;
+            int index = new Random().Next(i, nums.Length);
+            (nums[i], nums[index]) = (nums[index], nums[i]);
         }
         return nums;
     }
diff --git a/codes/go/chapter_computational_complexity/time_complexity.go b/codes/go/chapter_computational_complexity/time_complexity.go
index c11ab4791..cdb09b755 100644
--- a/codes/go/chapter_computational_complexity/time_complexity.go
+++ b/codes/go/chapter_computational_complexity/time_complexity.go
@@ -109,8 +109,7 @@ func linearLogRecur(n float64) int {
 	if n <= 1 {
 		return 1
 	}
-	count := linearLogRecur(n/2) +
-		linearLogRecur(n/2)
+	count := linearLogRecur(n / 2) + linearLogRecur(n / 2)
 	for i := 0.0; i < n; i++ {
 		count++
 	}
diff --git a/codes/java/chapter_computational_complexity/time_complexity.java b/codes/java/chapter_computational_complexity/time_complexity.java
index a9bf97fe9..b5d0c3cd9 100644
--- a/codes/java/chapter_computational_complexity/time_complexity.java
+++ b/codes/java/chapter_computational_complexity/time_complexity.java
@@ -107,8 +107,7 @@ public class time_complexity {
     static int linearLogRecur(float n) {
         if (n <= 1)
             return 1;
-        int count = linearLogRecur(n / 2) +
-                linearLogRecur(n / 2);
+        int count = linearLogRecur(n / 2) + linearLogRecur(n / 2);
         for (int i = 0; i < n; i++) {
             count++;
         }
diff --git a/codes/rust/chapter_computational_complexity/time_complexity.rs b/codes/rust/chapter_computational_complexity/time_complexity.rs
index 665931526..3473dd08b 100644
--- a/codes/rust/chapter_computational_complexity/time_complexity.rs
+++ b/codes/rust/chapter_computational_complexity/time_complexity.rs
@@ -111,8 +111,7 @@ fn linear_log_recur(n: f32) -> i32 {
     if n <= 1.0 {
         return 1;
     }
-    let mut count = linear_log_recur(n / 2.0) + 
-                    linear_log_recur(n / 2.0);
+    let mut count = linear_log_recur(n / 2.0) + linear_log_recur(n / 2.0);
     for _ in 0 ..n as i32 {
         count += 1;
     }
diff --git a/codes/zig/chapter_computational_complexity/time_complexity.zig b/codes/zig/chapter_computational_complexity/time_complexity.zig
index 3327fb37a..92439e96a 100644
--- a/codes/zig/chapter_computational_complexity/time_complexity.zig
+++ b/codes/zig/chapter_computational_complexity/time_complexity.zig
@@ -115,8 +115,7 @@ fn logRecur(n: f32) i32 {
 // 线性对数阶
 fn linearLogRecur(n: f32) i32 {
     if (n <= 1) return 1;
-    var count: i32 = linearLogRecur(n / 2) +
-                linearLogRecur(n / 2);
+    var count: i32 = linearLogRecur(n / 2) + linearLogRecur(n / 2);
     var i: f32 = 0;
     while (i < n) : (i += 1) {
         count += 1;
diff --git a/docs/chapter_hashing/hash_map.md b/docs/chapter_hashing/hash_map.md
index 9b0af22c2..eec4e9826 100755
--- a/docs/chapter_hashing/hash_map.md
+++ b/docs/chapter_hashing/hash_map.md
@@ -339,7 +339,7 @@
         Console.WriteLine(key);
     }
     // 单独遍历值 value
-    foreach (String val in map.Values) {
+    foreach (string val in map.Values) {
         Console.WriteLine(val);
     }
     ```