java -贪心

 给定一个字符串，一个K 

可以交换相邻字符，最多K次。问可以得到的最大值

如 

String s = "01326";

int k = 7;

 

 

01326-->60132-->63012-->63102

import java.util.*;

public class Main {

    public static void main(String[] args) {
        String s = "01326";
        int k = 7;
        int l = s.length();
        int id = 0;
        while (id < l && k > 0) {
            int kk = Math.min(k, l - id);
            int num = s.charAt(id) - '0';
            System.out.println("kk " + kk + " num: " + num);
            int tmpk = kk;
            for (int i = id + 1; i < id + kk; i++) {
                System.out.println("i " + i);
                if (num < (s.charAt(i) - '0')) {
                    num = s.charAt(i) - '0';
                    tmpk = i - id;
                }
            }
            kk = tmpk;
            String s1 = s.substring(0, id);
            String s2 = s.substring(id, id + kk);
            String s3 = s.substring(id + kk + 1, l);
            s = s1 + s.charAt(id + kk) + s2 + s3;
            System.out.println("s " + s);
            k -= kk;
            id++;
        }
        System.out.println(s);
    }
}