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diff --git a/works/life/operating-system-challenge/2/README.md b/works/life/operating-system-challenge/2/README.md
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+> 挑战二：写一个程序，运行该进程时，你计算机每一个核的 CPU 占用率是各不相同的有规律的曲线
+> 示例效果如：
+> ![sample](sample.jpg)
+
+Translation: Write a program and make each core of your CPU get a different but regular usage rate graph.
+
+Code is in `main.cpp`. Remember to not compile it with O2 optimization, or my loop will be eliminated.
+
+Final effect:
+![effect](effect.png)
diff --git a/works/life/operating-system-challenge/2/effect.png b/works/life/operating-system-challenge/2/effect.png
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index 0000000..984a3da
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+++ b/works/life/operating-system-challenge/2/effect.png
diff --git a/works/life/operating-system-challenge/2/main.cpp b/works/life/operating-system-challenge/2/main.cpp
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+++ b/works/life/operating-system-challenge/2/main.cpp
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+#include <Windows.h>
+#include <cmath>
+
+DWORD WINAPI Thread1(_In_ LPVOID lpParameter) {
+  int i;
+  while (true) {
+    i++;
+  }
+  return 0;
+}
+
+DWORD WINAPI Thread2(_In_ LPVOID lpParameter) {
+  while (true) {
+    for (long long i = 0; i < 5000000000; i++)
+      ;
+    Sleep(10000);
+  }
+
+  return 0;
+}
+
+DWORD WINAPI Thread3(_In_ LPVOID lpParameter) {
+  while (true) {
+    for (int i = 0; i < 4000000; i++)
+      ;
+    Sleep(10);
+  }
+
+  return 0;
+}
+
+DWORD WINAPI Thread4(_In_ LPVOID lpParameter) {
+  LARGE_INTEGER frequency;
+  QueryPerformanceFrequency(&frequency);
+
+  LARGE_INTEGER count;
+  QueryPerformanceCounter(&count);
+
+  double current_y = 0;
+
+  while (true) {
+    for (int i = 0; i < 3000000.0 * (1.0 + current_y); i++)
+      ;
+    Sleep(10 * (1 - current_y));
+
+    LARGE_INTEGER new_count;
+    QueryPerformanceCounter(&new_count);
+
+    auto s = (new_count.QuadPart - count.QuadPart) / frequency.QuadPart;
+    current_y = std::sin(s / 30.0 * 2 * 3.1415926535) * 0.6;
+  }
+
+  return 0;
+}
+
+int main() {
+  HANDLE thread1 = CreateThread(NULL, 0, Thread1, NULL, 0, NULL);
+  HANDLE thread2 = CreateThread(NULL, 0, Thread2, NULL, 0, NULL);
+  HANDLE thread3 = CreateThread(NULL, 0, Thread3, NULL, 0, NULL);
+  HANDLE thread4 = CreateThread(NULL, 0, Thread4, NULL, 0, NULL);
+
+  SetThreadAffinityMask(thread1, 1);
+  SetThreadAffinityMask(thread2, 1 << 1);
+  SetThreadAffinityMask(thread3, 1 << 2);
+  SetThreadAffinityMask(thread4, 1 << 3);
+
+  WaitForSingleObject(thread1, INFINITE);
+  WaitForSingleObject(thread2, INFINITE);
+  WaitForSingleObject(thread3, INFINITE);
+  WaitForSingleObject(thread4, INFINITE);
+
+  return 0;
+}
diff --git a/works/life/operating-system-challenge/2/sample.jpg b/works/life/operating-system-challenge/2/sample.jpg
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index 0000000..53b9f89
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+++ b/works/life/operating-system-challenge/2/sample.jpg