From e04f8415f86691c1e30e38ffb113c26c44c1fe68 Mon Sep 17 00:00:00 2001
From: Tetsuya Hasegawa <tetsuya.chicago@gmail.com>
Date: Wed, 29 May 2024 11:01:21 +0900
Subject: [PATCH] Create 1572-matrix-diagonal-sum.java

---
 java/1572-matrix-diagonal-sum.java | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 java/1572-matrix-diagonal-sum.java

diff --git a/java/1572-matrix-diagonal-sum.java b/java/1572-matrix-diagonal-sum.java
new file mode 100644
index 000000000..4157d083c
--- /dev/null
+++ b/java/1572-matrix-diagonal-sum.java
@@ -0,0 +1,13 @@
+class Solution {
+    public int diagonalSum(int[][] mat) {
+        int res = 0;
+        int n = mat.length;
+
+        for (int i = 0; i < n; i++) {
+            res += mat[i][i];
+            res += mat[i][n - 1 - i];
+        }
+
+        return res - (n % 2 == 1 ? mat[n / 2][n / 2] : 0);
+    }
+}