1202\. Smallest String With Swaps

Medium

You are given a string `s`, and an array of pairs of indices in the string `pairs` where `pairs[i] = [a, b]` indicates 2 indices(0-indexed) of the string.

You can swap the characters at any pair of indices in the given `pairs` **any number of times**.

Return the lexicographically smallest string that `s` can be changed to after using the swaps.

**Example 1:**

**Input:** s = "dcab", pairs = [[0,3],[1,2]]

**Output:** "bacd" **Explaination:** 

Swap s[0] and s[3], s = "bcad" 

Swap s[1] and s[2], s = "bacd"

**Example 2:**

**Input:** s = "dcab", pairs = [[0,3],[1,2],[0,2]]

**Output:** "abcd" **Explaination:**  

Swap s[0] and s[3], s = "bcad" 

Swap s[0] and s[2], s = "acbd" 

Swap s[1] and s[2], s = "abcd"

**Example 3:**

**Input:** s = "cba", pairs = [[0,1],[1,2]]

**Output:** "abc" **Explaination:**  

Swap s[0] and s[1], s = "bca" 

Swap s[1] and s[2], s = "bac" 

Swap s[0] and s[1], s = "abc"

**Constraints:**

*   `1 <= s.length <= 10^5`
*   `0 <= pairs.length <= 10^5`
*   `0 <= pairs[i][0], pairs[i][1] < s.length`
*   `s` only contains lower case English letters.