diff --git a/src/main.rs b/src/main.rs
index 5dd736c..cebe5f7 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,22 +1,42 @@
+use crate::arr::make_matrix;
+
 mod arr;
 mod list;
 
 struct Solution {}
 impl Solution {
-    pub fn is_rectangle_overlap(rec1: Vec<i32>, rec2: Vec<i32>) -> bool {
-        // [1] -- [3], [1] -- [3]
-        let a = !(rec1[2] <= rec2[0] || rec2[2] <= rec1[0]);
-        let b = !(rec1[1] >= rec2[3] || rec2[1] >= rec1[3]);
-        if a && b {
-            return true;
+    fn check(img1: &Vec<Vec<i32>>, img2: &Vec<Vec<i32>>, dx: i32, dy: i32) -> i32 {
+        let (length, width) = (img2.len() as i32, img2[0].len() as i32);
+        let mut ans=  0;
+        for i in 0..length {
+            for j in 0..width {
+                let x = i + dx;
+                let y = j + dy;
+                if x < 0 || y < 0 || x >= length || y>= width {
+                    continue;
+                }
+                if img1[x as usize][y as usize] == 1 && img2[i as usize][j as usize] == 1 {
+                    ans += 1;
+                }
+            }
         }
-        false
+        ans
+    }
+    pub fn largest_overlap(img1: Vec<Vec<i32>>, img2: Vec<Vec<i32>>) -> i32 {
+        let (len, width) = (img1.len() as i32, img1[0].len() as i32);
+        let mut ans = 0;
+        for i in -len + 1..len {
+            for j in -width + 1..width {
+                ans = ans.max(Self::check(&img1, &img2, i, j));
+            }
+        }
+        ans
     }
 }
 
 fn main() {
     println!(
         "{:?}",
-        Solution::is_rectangle_overlap(vec![0, 0, 2, 2], vec![1, 1, 3, 3])
+        Solution::largest_overlap(make_matrix("[[1,1,0],[0,1,0],[0,1,0]]"), make_matrix("[[0,0,0],[1,0,1],[0,0,1]]"))
     );
 }