From 1e5e8748ede1926bcb637463b330c955bec2b8e7 Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 20 Sep 2026 23:48:59 +0800
Subject: reverse

---
 bits.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/bits.c b/bits.c
index e280f1e..b4a41ff 100644
--- a/bits.c
+++ b/bits.c
@@ -117,7 +117,16 @@ int byteSwap(int x, int n, int m) {
  *   Difficulty: 3
  */
 unsigned reverse(unsigned v) {
-    return 2;
+  unsigned res = 0;
+  int i = 32;
+
+  while (i) {
+    res = (res << 1) | (v & 1);
+    v = v >> 1;
+    i--;
+  }
+
+  return res;
 }
 
 /*
-- 
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