uploaded at 2022. 12. 30. 오후 7:00:32

programmers/테이블 해시 함수/solution.java

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+// [문제 링크]: https://school.programmers.co.kr/learn/courses/30/lessons/147354
+
+import java.util.*;
+import java.util.stream.*;
+class Solution {
+    private int S_i(int[] a, int i) {return IntStream.of(a).mapToObj(b -> b%i).mapToInt(b->b).sum();}
+    public int solution(int[][] data, int col, int row_begin, int row_end) {
+        int answer = 0;
+        List<int[]> al = Arrays.asList(data);
+        al.sort((o1,o2) -> o2[0] - o1[0]);
+        al.sort((o1,o2) -> o1[col-1] - o2[col-1]);
+        for(int c = row_begin; c <= row_end; c++) answer ^= S_i(al.get(c-1),c);
+        return answer;
+    }
+}