From 3f189a32a74a2b29d1619fdafeebd7040edaf1eb Mon Sep 17 00:00:00 2001
From: JasonGitHub <jasonwu2011@gmail.com>
Date: Sun, 22 Dec 2013 22:53:02 +0800
Subject: [PATCH] Fixed a bug that might invoke undefined behavior

Calling front() on an empty container would invoke undefined behavior
---
 C++/chapSearching.tex | 1 +
 1 file changed, 1 insertion(+)

diff --git a/C++/chapSearching.tex b/C++/chapSearching.tex
index d668f0c1..e008d75b 100644
--- a/C++/chapSearching.tex
+++ b/C++/chapSearching.tex
@@ -179,6 +179,7 @@ \subsubsection{代码}
 class Solution {
 public:
     bool searchMatrix(const vector<vector<int>>& matrix, int target) {
+        if (matrix.empty()) return false;
         const size_t  m = matrix.size();
         const size_t n = matrix.front().size();