Create 1 June Count pairs Sum in matrices

1 June Count pairs Sum in matrices

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+class Solution {
+  public:
+    int countPairs(vector<vector<int>> &mat1, vector<vector<int>> &mat2, int x) {
+        int n = mat1.size();
+        int total = n * n;
+
+        int p1 = 0, p2 = total - 1; 
+        int cnt = 0;
+
+        while (p1 < total && p2 >= 0) {
+            int i1 = p1 / n, j1 = p1 % n;
+            int i2 = p2 / n, j2 = p2 % n;
+
+            int sum = mat1[i1][j1] + mat2[i2][j2];
+
+            if (sum == x) {
+                cnt++;
+                p1++;
+                p2--;
+            } else if (sum < x) {
+                p1++;
+            } else {
+                p2--;
+            }
+        }
+
+        return cnt;
+    }
+};