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Given a string and an integer K, return the lexicographically minimum string that can be achieved by applying at most K swaps of adjacent letters.

A string S is given. In one move, any two adjacent letters can be swapped. For example, given a string "abcd", it's possible to create "__ba__cd", "a__cb__d" or "ab__dc__" in one such move. What is the lexicographically minimum string that can be achieved by at most K moves?

Write a function:

class Solution { public String solution(String S, int K); }

that, given a string S of length N and an integer K, returns the lexicographically minimum string that can be achieved by at most K swaps of any adjacent letters.

**Examples:**

1. Given S = "decade" and K = 4, your function should return "adcede". Swaps could be:

d

ecade → dceade,

dc

eade → dcaede,

d

caede → dacede,

dacede →adcede.

2. Given S = "bbbabbb" and K = 2, your function should return "babbbbb". The swaps are:

bb

babbb → bbabbbb,

b

babbbb → babbbbb.

3. Given S = "abracadabra" and K = 15, your function should return "aaaaabrcdbr".

Write an ** efficient** algorithm for the following assumptions:

- N is an integer within the range [1..100,000];
- string S consists only of lowercase letters ('a'-'z');
- K is an integer within the range [0..1,000,000,000].

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