diff --git a/pset10/sort.c b/pset10/1-sort.c
similarity index 100%
rename from pset10/sort.c
rename to pset10/1-sort.c
diff --git a/pset10/2-bullet.c b/pset10/2-bullet.c
new file mode 100644
index 0000000..199bc60
--- /dev/null
+++ b/pset10/2-bullet.c
@@ -0,0 +1,61 @@
+#include <stdio.h>
+
+#define LEN 100
+
+//调整函数
+void distribute(int *bullets, int size, int number);
+
+int main() {
+  int bullets[LEN];
+  int n, m, i;
+
+  scanf("%d", &n); //读入战士总数
+  for (i = 0; i < n; i++) {
+    scanf("%d", &bullets[i]); //读入每个战士手中初始的子弹数
+  }
+  scanf("%d", &m);            //读入调整的次数（m>0)
+  distribute(bullets, n, m);  //调整
+  for (i = 0; i < n - 1; i++) //输出调整后结果
+  {
+    printf("%d ", bullets[i]);
+  }
+  printf("%d\n", bullets[i]);
+
+  return 0;
+}
+
+/* 请在这里填写答案 */
+void distribute(int *bullets, int size, int number) {
+  // Base case 1: every bullets are distributed
+  int equal = 1;
+  for (int i = 0; i < size - 1 && equal != 0; i++) {
+    if (bullets[i] != bullets[i + 1]) {
+      equal = 0;
+    }
+  }
+  if (equal == 1) {
+    return;
+  } else if (number == 0) { // Base case 2: number is zero
+    return;
+  } else { // Base case 3: not distributed
+    int add[LEN] = {};
+    for (int i = 0; i < size; i++) {
+      // Redistribute
+      if (bullets[i] % 2 == 1)
+        bullets[i] = (bullets[i] + 1) / 2;
+      else
+        bullets[i] = bullets[i] / 2;
+
+      if (i == size - 1) {
+        add[0] += bullets[i];
+      } else {
+        add[i + 1] += bullets[i];
+      }
+    }
+    for (int i = 0; i < size; i++) {
+      bullets[i] += add[i];
+    }
+    distribute(bullets, size, number - 1);
+    return;
+  }
+}