[20250914] PGM / LV2 / 테이블 해시 함수 / 김수연

suyeun84/202509/14 PGM LV2 테이블 해시 함수.md

@@ -0,0 +1,21 @@
+```java
+import java.util.*;
+class Solution {
+    public int solution(int[][] data, int col, int row_begin, int row_end) {
+        int answer = 0;
+        Arrays.sort(data, (a, b) -> {
+            if (a[col-1] == b[col-1]) return b[0] - a[0];
+            return a[col-1] - b[col-1];
+        });
+        for (int i = row_begin-1; i <= row_end-1; i++) {
+            int S = 0;
+            for (int j = 0; j < data[0].length; j++) {
+                S += (data[i][j] % (i+1));
+            }
+            answer = answer ^ S;
+        }
+
+        return answer;
+    }
+}
+```