72. 编辑距离

src/main.rs

@@ -1,43 +1,29 @@
-struct Solution;
 mod arr;
+struct Solution {}
 impl Solution {
-    fn is_same(mat: &Vec<Vec<i32>>, target: &Vec<Vec<i32>>) -> bool {
+    pub fn min_distance(word1: String, word2: String) -> i32 {
-        for i in 0..mat.len() {
+        let mut dp = vec![vec![0; word2.len() + 1]; word1.len() + 1];
-            for j in 0..mat[i].len() {
+        let word1 = word1.chars().collect::<Vec<char>>();
-                if mat[i][j] != target[i][j] {
+        let word2 = word2.chars().collect::<Vec<char>>();
-                    return false;
+        for i in 1..=word1.len() {
+            dp[i][0] = dp[i - 1][0] + 1;
+        }
+        for i in 1..=word2.len() {
+            dp[0][i] = dp[0][i - 1] + 1;
+        }
+        for i in 0..word1.len() {
+            for j in 0..word2.len() {
+                dp[i + 1][j + 1] = (dp[i][j] + if word1[i] != word2[j] { 1 } else { 0 })
+                    .min(dp[i][j + 1] + 1)
+                    .min(dp[i + 1][j] + 1);
             }
         }
-        }
+        dp[word1.len()][word2.len()]
-        true
-    }
-    pub fn find_rotation(mat: Vec<Vec<i32>>, target: Vec<Vec<i32>>) -> bool {
-        let mut v = vec![vec![0; mat[0].len()]; mat.len()];
-        if Solution::is_same(&mat, &target) {
-            return true;
-        }
-        for x in 1..4 {
-            for i in 0..mat.len() {
-                for j in 0..mat[i].len() {
-                    let (mut py, mut px) = (i, j);
-                    for _ in 0..x {
-                        (px, py) = (mat.len() - 1 - py, px)
-                    }
-                    v[py][px] = mat[i][j];
-                }
-            }
-            if Self::is_same(&v, &target) {
-                return true;
-            }
-        }
-        false
     }
 }
-
 fn main() {
-    let result = Solution::find_rotation(
+    println!(
-        arr::make_matrix(r#"[[1,0,0],[1,0,1],[0,0,1]]"#),
+        "{:?}",
-        arr::make_matrix(r#"[[0,1,1],[0,0,0],[1,1,0]]"#),
+        Solution::min_distance("intention".to_string(), "execution".to_string())
     );
-    println!("{:?}", result);
 }