Jump game ii

Cargo.toml

@@ -17,4 +17,6 @@ members = [
     "prefix_and_suffix_search",
     "non_decreasing_array",
     "jump_game_ii",
+    "convert_sorted_list_to_binary_search_tree",
+    "delete_operation_for_two_strings",
 ]

convert_sorted_list_to_binary_search_tree/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "convert_sorted_list_to_binary_search_tree"
+version = "0.1.0"
+authors = ["Ryan Li <conbas2019@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

convert_sorted_list_to_binary_search_tree/src/lib.rs

@@ -0,0 +1,72 @@
+use std::cell::RefCell;
+use std::rc::Rc;
+
+// Definition for singly-linked list.
+#[derive(PartialEq, Eq, Clone, Debug)]
+pub struct ListNode {
+    pub val: i32,
+    pub next: Option<Box<ListNode>>,
+}
+
+impl ListNode {
+    #[inline]
+    fn new(val: i32) -> Self {
+        ListNode { next: None, val }
+    }
+}
+
+// Definition for a binary tree node.
+#[derive(Debug, PartialEq, Eq)]
+pub struct TreeNode {
+    pub val: i32,
+    pub left: Option<Rc<RefCell<TreeNode>>>,
+    pub right: Option<Rc<RefCell<TreeNode>>>,
+}
+
+impl TreeNode {
+    #[inline]
+    pub fn new(val: i32) -> Self {
+        TreeNode {
+            val,
+            left: None,
+            right: None,
+        }
+    }
+}
+
+struct Solution {}
+
+impl Solution {
+    pub fn sorted_list_to_bst(head: Option<Box<ListNode>>) -> Option<Rc<RefCell<TreeNode>>> {
+        None
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn example_1() {
+        let head = vec![-10, -3, 0, 5, 9];
+        let expected = vec![Some(0), Some(-3), Some(9), Some(-10), None, Some(5)];
+    }
+
+    #[test]
+    fn example_2() {
+        let head: Vec<i32> = vec![];
+        let expected: Vec<i32> = vec![];
+    }
+
+    #[test]
+    fn example_3() {
+        let head = vec![0];
+        let expected = vec![0];
+    }
+
+    #[test]
+    fn example_4() {
+        let head = vec![1, 3];
+        let expected = vec![3, 1];
+    }
+}

delete_operation_for_two_strings/Cargo.toml

@@ -0,0 +1,9 @@
+[package]
+name = "delete_operation_for_two_strings"
+version = "0.1.0"
+authors = ["Ryan Li <conbas2019@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

delete_operation_for_two_strings/src/lib.rs

@@ -0,0 +1,65 @@
+/*
+ * https://leetcode.com/explore/challenge/card/may-leetcoding-challenge-2021/598/week-1-may-1st-may-7th/3734/
+ * https://leetcode.com/problems/delete-operation-for-two-strings/
+*/
+
+#[cfg(test)]
+mod tests {
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}
+pub struct Solution {}
+
+impl Solution {
+    pub fn min_distance(word1: String, word2: String) -> i32 {
+        let mut dp = vec![vec![None; word2.len() + 1]; word1.len() + 1];
+        let common_length = Self::lcs(&word1, &word2, word1.len(), word2.len(), &mut dp);
+        (word1.len() + word2.len() - 2 * common_length) as i32
+    }
+
+    fn lcs(s1: &str, s2: &str, m: usize, n: usize, dp: &mut Vec<Vec<Option<usize>>>) -> usize {
+        // comparing first m characters in s1 and first n characters in s2
+        if let Some(length) = dp[m][n] {
+            return length;
+        }
+        let length = if m == 0 || n == 0 {
+            0
+        } else if s1.chars().nth(m - 1) == s2.chars().nth(n - 1) {
+            1 + Self::lcs(s1, s2, m - 1, n - 1, dp)
+        } else {
+            Self::lcs(s1, s2, m - 1, n, dp).max(Self::lcs(s1, s2, m, n - 1, dp))
+        };
+        dp[m][n] = Some(length);
+        length
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn example_1_lcs() {
+        let word1 = "sea";
+        let word2 = "eat";
+        let expected = 2;
+        let mut dp = vec![vec![None; word2.len() + 1]; word1.len() + 1];
+        assert_eq!(
+            Solution::lcs(word1, word2, word1.len(), word2.len(), &mut dp),
+            expected
+        );
+    }
+
+    #[test]
+    fn example_1() {
+        let word1 = "sea";
+        let word2 = "eat";
+        let expected = 2;
+        assert_eq!(
+            Solution::min_distance(word1.to_string(), word2.to_string()),
+            expected
+        );
+    }
+}