1345. 跳跃游戏 IV

src/main.rs

@@ -1,22 +1,57 @@
 mod arr;
 
 struct Solution {}
+use std::collections::hash_map::Entry;
+use std::collections::{HashMap, VecDeque};
+
 impl Solution {
-    pub fn separate_digits(nums: Vec<i32>) -> Vec<i32> {
+    pub fn min_jumps(arr: Vec<i32>) -> i32 {
-        let mut ans = vec![];
+        let mut mp = HashMap::new();
-        for x in nums.iter() {
+        for i in 0..arr.len() {
-            let mut y = *x;
+            mp.entry(arr[i])
-            let mut local_ans = vec![];
+                .and_modify(|x: &mut Vec<usize>| x.push(i))
-            while y > 0 {
+                .or_insert(vec![i]);
-                local_ans.push(y % 10);
-                y /= 10;
-            }
-            local_ans.reverse();
-            ans.extend(local_ans.iter());
         }
-        ans
+        let mut depth = vec![arr.len() as i32 + 1; arr.len()];
+        depth[arr.len() - 1] = 0;
+        let mut queue = VecDeque::new();
+        let mut inserted = vec![false; arr.len()];
+        inserted[arr.len() - 1] = true;
+        queue.push_back(arr.len() - 1);
+        while let Some(x) = queue.pop_front() {
+            if x > 0 {
+                if !inserted[x - 1] {
+                    depth[x - 1] = depth[x] + 1;
+                    queue.push_back(x - 1);
+                    inserted[x - 1] = true;
+                }
+            }
+            if x + 1 < arr.len() {
+                if !inserted[x + 1] {
+                    depth[x + 1] = depth[x] + 1;
+                    queue.push_back(x + 1);
+                    inserted[x + 1] = true;
+                }
+            }
+            if let Entry::Occupied(arr) = mp.entry(arr[x]) {
+                for y in arr.get() {
+                    if !inserted[*y] {
+                        depth[*y] = depth[x] + 1;
+                        queue.push_back(*y);
+                        inserted[*y] = true;
+                    }
+                }
+            }
+            if inserted[0] {
+                return depth[0];
+            }
+        }
+        -1
     }
 }
 fn main() {
-    println!("{:?}", Solution::separate_digits(vec![13, 25, 83, 77]));
+    println!(
+        "{:?}",
+        Solution::min_jumps(vec![100, -23, -23, 404, 100, 23, 23, 23, 3, 404])
+    );
 }