feat: add js solution to lc problem: No.2029

Author: rain84

solution/2000-2099/2029.Stone Game IX/README.md

@@ -263,6 +263,34 @@ function stoneGameIX(stones: number[]): boolean {
 }
 ```
 
+#### JavaScript
+
+```js
+function stoneGameIX(stones) {
+    if (stones.length === 1) return false;
+
+    const cnt = Array(3).fill(0);
+    for (const x of stones) cnt[x % 3]++;
+
+    const check = (x, cnt) => {
+        let c = 1;
+        if (--cnt[x] < 0) return false;
+
+        while (cnt[1] || cnt[2]) {
+            if (cnt[x]) {
+                cnt[x]--;
+                x = x === 1 ? 2 : 1;
+            } else return (c + cnt[0]) % 2 === 1;
+            c++;
+        }
+
+        return false;
+    };
+
+    return check(1, [...cnt]) || check(2, [...cnt]);
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/2000-2099/2029.Stone Game IX/README_EN.md

@@ -256,6 +256,34 @@ function stoneGameIX(stones: number[]): boolean {
 }
 ```
 
+#### JavaScript
+
+```js
+function stoneGameIX(stones) {
+    if (stones.length === 1) return false;
+
+    const cnt = Array(3).fill(0);
+    for (const x of stones) cnt[x % 3]++;
+
+    const check = (x, cnt) => {
+        let c = 1;
+        if (--cnt[x] < 0) return false;
+
+        while (cnt[1] || cnt[2]) {
+            if (cnt[x]) {
+                cnt[x]--;
+                x = x === 1 ? 2 : 1;
+            } else return (c + cnt[0]) % 2 === 1;
+            c++;
+        }
+
+        return false;
+    };
+
+    return check(1, [...cnt]) || check(2, [...cnt]);
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

solution/2000-2099/2029.Stone Game IX/Solution2.js

@@ -0,0 +1,23 @@
+function stoneGameIX(stones) {
+    if (stones.length === 1) return false;
+
+    const cnt = Array(3).fill(0);
+    for (const x of stones) cnt[x % 3]++;
+
+    const check = (x, cnt) => {
+        let c = 1;
+        if (--cnt[x] < 0) return false;
+
+        while (cnt[1] || cnt[2]) {
+            if (cnt[x]) {
+                cnt[x]--;
+                x = x === 1 ? 2 : 1;
+            } else return (c + cnt[0]) % 2 === 1;
+            c++;
+        }
+
+        return false;
+    };
+
+    return check(1, [...cnt]) || check(2, [...cnt]);
+}