Update docs/ds/binary-heap.md

Co-Authored-By: ouuan <y___o___u@126.com>

diff --git a/docs/ds/binary-heap.md b/docs/ds/binary-heap.md
index f3c4e4a..ee46524 100644 (file)
--- a/docs/ds/binary-heap.md
+++ b/docs/ds/binary-heap.md
@@ -59,7 +59,7 @@ void up(x) {
     x /= 2;
   }
 }
-void down(x) {
+void down(int x) {
   while (x * 2 <= n) {
     t = x * 2;
     if (t + 1 <= n && h[t + 1] > h[t]) t++;