diff --git a/src/main.rs b/src/main.rs
index 078e35b..5dd736c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,84 +1,22 @@
-use crate::arr::make_matrix;
-use std::cmp::Reverse;
-use std::collections::BTreeMap;
-
 mod arr;
 mod list;
-mod tree;
 
-struct MinStack {
-    heap: BTreeMap<Reverse<i32>, i32>,
-    stack: Vec<i32>,
-}
-
-/**
- * `&self` means the method takes an immutable reference.
- * If you need a mutable reference, change it to `&mut self` instead.
- */
-impl MinStack {
-    fn new() -> Self {
-        MinStack {
-            heap: BTreeMap::new(),
-            stack: Vec::new(),
+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 push(&mut self, value: i32) {
-        self.stack.push(value);
-        let entry = self.heap.entry(Reverse(value)).or_insert(0);
-        *entry += 1;
-    }
-
-    fn pop(&mut self) {
-        let ele = self.stack.pop();
-        let entry = self.heap.get_mut(&Reverse(ele.unwrap())).unwrap();
-        if *entry == 1 {
-            self.heap.remove_entry(&Reverse(ele.unwrap()));
-        } else {
-            *entry -= 1;
-        }
-    }
-
-    fn top(&self) -> i32 {
-        self.stack.last().cloned().unwrap()
-    }
-
-    fn get_min(&self) -> i32 {
-        self.heap.last_key_value().unwrap().0.0
+        false
     }
 }
 
-/**
- * Your MinStack object will be instantiated and called as such:
- * let obj = MinStack::new();
- * obj.push(value);
- * obj.pop();
- * let ret_3: i32 = obj.top();
- * let ret_4: i32 = obj.get_min();
- */
 fn main() {
-    let opers = [
-        "MinStack", "push", "push", "push", "getMin", "pop", "getMin", "pop", "getMin", "pop",
-        "push", "push", "push", "getMin", "pop", "top", "getMin", "pop", "getMin", "pop",
-    ];
-    let data =
-        make_matrix("[[],[0],[1],[0],[],[],[],[],[],[],[-2],[-1],[-2],[],[],[],[],[],[],[]]");
-    let mut st = MinStack::new();
-    for i in 1..opers.len() {
-        match opers[i] {
-            "push" => {
-                st.push(data[i][0]);
-            }
-            "pop" => {
-                st.pop();
-            }
-            "top" => {
-                println!("{:?}", st.top());
-            }
-            "getMin" => {
-                println!("{:?}", st.get_min());
-            }
-            _ => {}
-        }
-    }
+    println!(
+        "{:?}",
+        Solution::is_rectangle_overlap(vec![0, 0, 2, 2], vec![1, 1, 3, 3])
+    );
 }