diff --git a/leetcode-130-Surrounded-Regions.md b/leetcode-130-Surrounded-Regions.md
index 3fd4a4b09..f004c0e6a 100644
--- a/leetcode-130-Surrounded-Regions.md
+++ b/leetcode-130-Surrounded-Regions.md
@@ -69,10 +69,10 @@ private boolean solveHelper(int row, int col, char[][] board, HashSet<string> vi
 }
 
 //分别尝试四个方向
- if (solveHelper(row - 1, col, board, visited, memoization)
- &#124;&#124; solveHelper(row, col - 1, board, visited, memoization)
- &#124;&#124; solveHelper(row + 1, col, board, visited, memoization)
- &#124;&#124; solveHelper(row, col + 1, board, visited, memoization)) {
+ if (solveHelper(row - 1, col, board, visited)
+ &#124;&#124; solveHelper(row, col - 1, board, visited)
+ &#124;&#124; solveHelper(row + 1, col, board, visited)
+ &#124;&#124; solveHelper(row, col + 1, board, visited)) {
 return true;
 } else {
 return false;
@@ -167,7 +167,6 @@ public void solve(char[][] board) {
 if (rows == 0) {
 return;
 }
- HashSet<string> memoization = new HashSet<strong>();
 int cols = board[0].length;
 boolean[][] visited = new boolean[rows][cols];
 for (int i = 0; i < cols; i++) { @@ -230,7 +229,6 @@ public void solve(char[][] board) { if (rows == 0) { return; } - HashSet<string> memoization = new HashSet<strong>();
 int cols = board[0].length;
 for (int i = 0; i < cols; i++) {
 //最上边一行的所有 O 做 DFS
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