diff --git "a/notes/Leetcode \351\242\230\350\247\243.md" "b/notes/Leetcode \351\242\230\350\247\243.md"
index 2d6b2d5f94207ce184925e03180f565866dd8cfb..d09ff18d90bf8e6878f9a435e1b94d421813e721 100644
--- "a/notes/Leetcode \351\242\230\350\247\243.md"	
+++ "b/notes/Leetcode \351\242\230\350\247\243.md"	
@@ -2505,9 +2505,9 @@ public int minPathSum(int[][] grid) {
     for (int i = 0; i < m; i++) {
         for (int j = 0; j < n; j++) {
             if (i == 0) {
-                dp[j] = dp[j - 1];
+                if (j>0) dp[j] = dp[j - 1];
             } else {
-                dp[j] = Math.min(dp[j - 1], dp[j]);
+                if (j>0) dp[j] = Math.min(dp[j - 1], dp[j]);
             }
             dp[j] += grid[i][j];
         }