From cfe76225290e4a1f6f0e7ebf15f21436abd07eef Mon Sep 17 00:00:00 2001
From: chayan das <dasshuvo817@gmail.com>
Date: Thu, 21 Aug 2025 21:40:20 +0530
Subject: [PATCH] Create 1504. Count Submatrices With All Ones

---
 1504. Count Submatrices With All Ones | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 1504. Count Submatrices With All Ones

diff --git a/1504. Count Submatrices With All Ones b/1504. Count Submatrices With All Ones
new file mode 100644
index 0000000..141bed7
--- /dev/null
+++ b/1504. Count Submatrices With All Ones	
@@ -0,0 +1,21 @@
+class Solution {
+public:
+    int numSubmat(vector<vector<int>>& mat) {
+        int m = mat.size(), n = mat[0].size(), ans = 0;
+        vector<int> heights(n, 0);
+        for (int i = 0; i < m; i++) {
+            for (int j = 0; j < n; j++) {
+                if (mat[i][j] == 0) heights[j] = 0;
+                else heights[j] += 1;
+            }
+            for (int j = 0; j < n; j++) {
+                int minHeight = heights[j];
+                for (int k = j; k >= 0 && minHeight > 0; k--) {
+                    minHeight = min(minHeight, heights[k]);
+                    ans += minHeight;
+                }
+            }
+        }
+        return ans;
+    }
+};