Create 1202-smallest-string-with-swaps.js

Author: everthis

1202-smallest-string-with-swaps.js

@@ -0,0 +1,43 @@
+/**
+ * @param {string} s
+ * @param {number[][]} pairs
+ * @return {string}
+ */
+const smallestStringWithSwaps = function(s, pairs) {
+  let set = Array(s.length).fill(-1)
+  function union(a, b) {
+    let root1 = find(a)
+    let root2 = find(b)
+    if (root1 !== root2) {
+      set[root2] = root1
+    }
+  }
+  function find(a) {
+    if (set[a] < 0) {
+      return a
+    } else {
+      return (set[a] = find(set[a]))
+    }
+  }
+  for (let pair of pairs) {
+    union(pair[0], pair[1])
+  }
+  let groups = []
+  for (let i = 0; i < s.length; i++) {
+    groups[i] = []
+  }
+  for (let i = 0; i < s.length; i++) {
+    groups[find(i)].push(i)
+  }
+  let sArr = s.split('')
+  for (let i = 0; i < s.length; i++) {
+    if (groups[i].length > 1) {
+      let chars = groups[i].map(idx => s[idx])
+      chars.sort()
+      for (let k = 0; k < groups[i].length; k++) {
+        sArr[groups[i][k]] = chars[k]
+      }
+    }
+  }
+  return sArr.join('')
+}