diff --git a/.gitignore b/.gitignore
index 04fb84c..6a79454 100644
--- a/.gitignore
+++ b/.gitignore
@@ -115,3 +115,5 @@ Alogrithm/Alogrithm/Debug/9_AddBinary.obj
 Alogrithm/.vs/Alogrithm/v16/ipch/AutoPCH/27a527fda8b54c6b/9_ADDBINARY.ipch
 Alogrithm/.vs/Alogrithm/v16/ipch/AutoPCH/d00489e06883ba57/9_ ADDBINARY.ipch
 Alogrithm/TestResults/dc42f77d-a2f7-41a9-8b8c-1ee3f1a82eb9/鏋梍MI-1 2021-01-18 14_12_23.coverage
+Alogrithm/.vs/Alogrithm/v16/ipch/AutoPCH/86fa7a487ad3f37c/10_BINARYTREEPATHS.ipch
+Alogrithm/.vs/Alogrithm/v16/TestStore/3/003.testlog
diff --git a/Alogrithm/.vs/Alogrithm/v16/.suo b/Alogrithm/.vs/Alogrithm/v16/.suo
index 9014215..85d2185 100644
Binary files a/Alogrithm/.vs/Alogrithm/v16/.suo and b/Alogrithm/.vs/Alogrithm/v16/.suo differ
diff --git a/Alogrithm/Alogrithm/config/1_ContainsNearbyDuplicate.ini b/Alogrithm/Alogrithm/config/1_ContainsNearbyDuplicate.ini
index adc5d77..82c96d8 100644
--- a/Alogrithm/Alogrithm/config/1_ContainsNearbyDuplicate.ini
+++ b/Alogrithm/Alogrithm/config/1_ContainsNearbyDuplicate.ini
@@ -18,6 +18,11 @@ output=1
 array=1,0,3,4,2,1,0,3,4
 key=3
 output=0
-
-
-
+[Test6]
+array=8,7,15,1,6,1,9,15
+key=1
+output=0
+[Test7]
+array=8,7,15,1,6,1,9,15
+key=3
+output=1
\ No newline at end of file
diff --git a/Alogrithm/Alogrithm/config/2_ExcelSheetColumnTiTle.ini b/Alogrithm/Alogrithm/config/2_ExcelSheetColumnTiTle.ini
index 062ee8e..b10fbb9 100644
--- a/Alogrithm/Alogrithm/config/2_ExcelSheetColumnTiTle.ini
+++ b/Alogrithm/Alogrithm/config/2_ExcelSheetColumnTiTle.ini
@@ -18,4 +18,4 @@ Na=52
 nExpect=AZ
 [Test7]
 Na=53
-nExpect=AAA
\ No newline at end of file
+nExpect=BA
\ No newline at end of file
diff --git a/Alogrithm/Alogrithm/include/2_ExcelSheetColumnTitle.h b/Alogrithm/Alogrithm/include/2_ExcelSheetColumnTitle.h
index f0f9351..a1ff4b7 100644
--- a/Alogrithm/Alogrithm/include/2_ExcelSheetColumnTitle.h
+++ b/Alogrithm/Alogrithm/include/2_ExcelSheetColumnTitle.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 char* ExcelSheetColumnTitle(int n);
\ No newline at end of file
diff --git a/Alogrithm/Alogrithm/src/2_ExcelSheetColumnTitle.cpp b/Alogrithm/Alogrithm/src/2_ExcelSheetColumnTitle.cpp
index f5c0164..e216b2e 100644
--- a/Alogrithm/Alogrithm/src/2_ExcelSheetColumnTitle.cpp
+++ b/Alogrithm/Alogrithm/src/2_ExcelSheetColumnTitle.cpp
@@ -1,20 +1,17 @@
 #include "../include/2_ExcelSheetColumnTitle.h"
-#define STR_LEN 100
+
 //给定一个整数，返回它在 Excel 表中相对应的列名称，如果在Excel表中找不到该列，则返回""。
 char* ExcelSheetColumnTitle(int n)
 {
-	static char str[STR_LEN] = { 0 };
-	int i = 0;
-	while (n > 0) {
-		 if ((n > 0) && (n <= 26)) {
-			str[i] = 'A' + n - 1;
-		}
-		else if (n > 26) {
-			 str[i] = 'A';
-		}
-		 n = n - 26;
-		 i++;	
+	char* ret = (char*)malloc(sizeof(char) * 10);//开辟一片空间，存需要返回的字符串
+	int i = 9;//
+	while (n)
+	{
+		n -= 1;//给n减一，因为n后面是从'A'开始的
+		ret[i - 1] = n % 26 + 'A';//从后往前赋值，从最后一个赋值到第一个
+		n /= 26;
+		i--;//给下一个赋值
 	}
-	char* pstr = str;
-	return pstr;
+	ret[9] = '\0';
+	return ret + i;//去掉前面的前导字符，如果前面没有字符则指针后移
 }
\ No newline at end of file
diff --git a/Alogrithm/UnitTest/UnitTest.cpp b/Alogrithm/UnitTest/UnitTest.cpp
index aec922b..77122af 100644
--- a/Alogrithm/UnitTest/UnitTest.cpp
+++ b/Alogrithm/UnitTest/UnitTest.cpp
@@ -45,7 +45,7 @@ namespace UnitTest
 					GetPrivateProfileString(Section_Name[i], "Na", " ", Na.GetBuffer(20), 20, FileName_2);
 					GetPrivateProfileString(Section_Name[i], "nExpect", " ", nExpect.GetBuffer(100), 100, FileName_2);
 					char* nReal = ExcelSheetColumnTitle(_ttoi(Na));
-					Assert::AreEqual(*nReal, *nExpect);
+					Assert::AreEqual(nReal, nExpect);
 				}
 			}
 	};