diff --git a/codes/cpp/chapter_computational_complexity/time_complexity.cpp b/codes/cpp/chapter_computational_complexity/time_complexity.cpp
index 5488af22a4..5e783edb82 100644
--- a/codes/cpp/chapter_computational_complexity/time_complexity.cpp
+++ b/codes/cpp/chapter_computational_complexity/time_complexity.cpp
@@ -158,7 +158,7 @@ int main() {
     count = logRecur(n);
     cout << "对数阶（递归实现）的操作数量 = " << count << endl;
 
-    count = linearLogRecur((n);
+    count = linearLogRecur(n);
     cout << "线性对数阶（递归实现）的操作数量 = " << count << endl;
 
     count = factorialRecur(n);
diff --git a/codes/csharp/chapter_computational_complexity/time_complexity.cs b/codes/csharp/chapter_computational_complexity/time_complexity.cs
index 4c103b3da5..0f3efa4bcf 100644
--- a/codes/csharp/chapter_computational_complexity/time_complexity.cs
+++ b/codes/csharp/chapter_computational_complexity/time_complexity.cs
@@ -10,7 +10,7 @@ public class time_complexity {
     void Algorithm(int n) {
         int a = 1;  // +0（技巧 1）
         a += n;  // +0（技巧 1）
-                    // +n（技巧 2）
+        // +n（技巧 2）
         for (int i = 0; i < 5 * n + 1; i++) {
             Console.WriteLine(0);
         }
diff --git a/codes/dart/chapter_computational_complexity/time_complexity.dart b/codes/dart/chapter_computational_complexity/time_complexity.dart
index 906406813e..3bc3afc4b7 100644
--- a/codes/dart/chapter_computational_complexity/time_complexity.dart
+++ b/codes/dart/chapter_computational_complexity/time_complexity.dart
@@ -90,7 +90,7 @@ int expRecur(int n) {
 int logarithmic(int n) {
   int count = 0;
   while (n > 1) {
-    n = n / 2;
+    n = n ~/ 2;
     count++;
   }
   return count;
@@ -99,13 +99,13 @@ int logarithmic(int n) {
 /* 对数阶（递归实现） */
 int logRecur(int n) {
   if (n <= 1) return 0;
-  return logRecur(n / 2) + 1;
+  return logRecur(n ~/ 2) + 1;
 }
 
 /* 线性对数阶 */
 int linearLogRecur(int n) {
   if (n <= 1) return 1;
-  int count = linearLogRecur(n / 2) + linearLogRecur(n / 2);
+  int count = linearLogRecur(n ~/ 2) + linearLogRecur(n ~/ 2);
   for (var i = 0; i < n; i++) {
     count++;
   }