From f34fc1428b319ff2a41a7ff05e4602e3243762ed Mon Sep 17 00:00:00 2001
From: ryze <42087725+Ryze-Borgia@users.noreply.github.com>
Date: Wed, 17 Apr 2019 10:33:17 +0800
Subject: [PATCH] may be an error (#1168)

should visit if the additive inverse of a[i] exist???
---
 docs/basic/enumerate.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/basic/enumerate.md b/docs/basic/enumerate.md
index 654dd688..7384cc14 100644
--- a/docs/basic/enumerate.md
+++ b/docs/basic/enumerate.md
@@ -55,7 +55,7 @@ bool met[MAXN * 2];
 // 初始化 met 数组为 0；
 memset(met, 0, sizeof(met));
 for (int i = 0; i < n; ++i) {
-  if (met[a[i] + MAXN]) ++ans;
+  if (met[MAXN - a[i]]) ++ans;
   // 为了避免负数下标
   met[a[i] + MAXN] = 1;
 }
-- 
2.11.0