From 8dc87e8d58730cd93b1da80f02863398ff8e2dae Mon Sep 17 00:00:00 2001
From: Richard Qin <richard.qin.x@gmail.com>
Date: Sun, 20 Sep 2026 23:26:28 +0800
Subject: byteSwap

---
 bits.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'bits.c')

diff --git a/bits.c b/bits.c
index 8652b1a..0be410f 100644
--- a/bits.c
+++ b/bits.c
@@ -101,7 +101,19 @@ int logtwo(int v) {
  *    Difficulty: 2
  */
 int byteSwap(int x, int n, int m) {
-    return 2;
+  int ns = (n << 3) ;
+  int ms = (m << 3);
+  int nb = (x >> ns) & 0xFF;
+  int mb = (x >> ms) & 0xFF;
+
+  int mask = ~((0xFF << ns) | (0xFF <<  ms));
+
+  x = x & mask;
+
+  x = x | (nb << ms);
+  x = x | (mb << ns);
+
+  return x;
 }
 
 /*
-- 
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