problems(java): add “2352. Equal Row and Column Pairs”

Signed-off-by: Matej Focko <mfocko@redhat.com>

problems/java/equal-row-and-column-pairs.java

@@ -0,0 +1,27 @@
+class Solution {
+    public int equalPairs(int[][] grid) {
+        int count = 0, n = grid.length;
+
+        // Check each row r against each column c.
+        for (int r = 0; r < n; ++r) {
+            for (int c = 0; c < n; ++c) {
+                boolean match = true;
+
+                // Iterate over row r and column c.
+                for (int i = 0; i < n; ++i) {
+                    if (grid[r][i] != grid[i][c]) {
+                        match = false;
+                        break;
+                    }
+                }
+
+                // If row r equals column c, increment count by 1.
+                if (match) {
+                    count++;
+                }
+            }
+        }
+
+        return count;
+    }
+}