Create 1345.跳跃游戏 IV.js

Author: yinxin630

1345.跳跃游戏 IV.js

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+/**
+ * @param {number[]} arr
+ * @return {number}
+ */
+var minJumps = function(arr) {
+    const dp = [];
+    dp[arr.length - 1] = 0;
+
+    const map = {};
+    for (let i = 0; i < arr.length; i++) {
+        map[arr[i]] = map[arr[i]] || [];
+        map[arr[i]].push(i);
+    }
+
+    const queue = [arr.length - 1];
+    while (queue.length) {
+        const i = queue.shift();
+        if (i === 0) {
+            return dp[0];
+        }
+
+        if (i + 1 < arr.length && dp[i + 1] === undefined) {
+            dp[i + 1] = dp[i] + 1;
+            queue.push(i + 1);
+        }
+        if (i - 1 >= 0 && dp[i - 1] === undefined) {
+            dp[i - 1] = dp[i] + 1;
+            queue.push(i - 1);
+        }
+        for (const n of map[arr[i]]) {
+            if (n !== i && dp[n] === undefined) {
+                dp[n] = dp[i] + 1;
+                queue.push(n);
+            }
+        }
+    }
+
+    return 0;
+};