diff --git a/src/main.rs b/src/main.rs
index cebe5f7..1168c53 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,29 +5,53 @@ mod list;
 
 struct Solution {}
 impl Solution {
-    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 {
+    pub fn max_palindromes(s: String, k: i32) -> i32 {
+        let k = k as usize;
+        let mut mat = vec![vec![false; s.len()]; s.len() + 1];
+        let s = s.as_bytes();
+        let (mut af1, mut af2) = (false, true);
+        for i in 0..s.len() {
+            mat[0][i] = true;
+            mat[1][i] = i + 1 < s.len() && s[i] == s[i + 1];
+            af2 &= mat[1][i];
+        }
+        for i in 2..s.len() {
+            if i % 2 == 0 {
+                if af1 {
                     continue;
                 }
-                if img1[x as usize][y as usize] == 1 && img2[i as usize][j as usize] == 1 {
-                    ans += 1;
+            } else if af2 {
+                continue;
+            }
+            let mut local = false;
+            for j in 0..s.len() - i {
+                mat[i][j] = mat[i - 2][j + 1] && s[j] == s[j + i];
+                local |= mat[i][j];
+            }
+            if i%2 == 0 {
+                af1 = !local;
+            }else {
+                af2 = !local;
+            }
+        }
+        // for i in 0..s.len() {
+        //     println!("{:?} ", mat[i]);
+        // }
+        let mut events = Vec::new();
+        for i in k - 1 .. s.len() {
+            for j in 0..s.len() - i {
+                if mat[i][j] {
+                    events.push((j, j + i + 1));
                 }
             }
         }
-        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));
+        events.sort_unstable_by(|a,b| a.1.cmp(&b.1));
+        // println!("{:?}", events);
+        let (mut certain,mut ans) = (0,0);
+        for (a,b) in events {
+            if a >= certain {
+                certain = b;
+                ans += 1;
             }
         }
         ans
@@ -37,6 +61,6 @@ impl Solution {
 fn main() {
     println!(
         "{:?}",
-        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]]"))
+        Solution::max_palindromes("abaccdbbd".to_string(), 3)
     );
 }