Create 1819-number-of-different-subsequences-gcds.js

Author: everthis

1819-number-of-different-subsequences-gcds.js

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+/**
+ * @param {number[]} nums
+ * @return {number}
+ */
+const countDifferentSubsequenceGCDs = function(nums) {
+    const MAX = 2e5 + 1;
+     const cnt = Array(MAX).fill(0)
+    for (let x of nums) cnt[x] = true;
+    let ret = 0;
+    for (let x=1; x<MAX; x++) {
+        let g = 0;
+        for (let y=x; y<MAX; y+=x) {
+            if (cnt[y]) g = gcd(g, y);
+        }
+        if (g == x) ret++;
+    }
+    return ret;
+};
+
+function gcd(x,y){
+    if(y === 0) return x
+    return gcd(y, x % y)
+}
+
+