Problem: 2050D - Digital string maximization
Language: java

Solution 1 (runtime: 234 ms):
import java.io.*;
import java.util.*;

public class D_Digital_string_maximization {
    public static void main(String[] args) throws IOException {
        FastIO io = new FastIO();
        int t = io.nextInt();
        while(t-- > 0) {
            String s = io.next();
            int n = s.length();
            int[] a = new int[n];
            for(int i = 0; i < n; i++) a[i] = (int)(s.charAt(i) - '0');
            for (int i = 0; i < n - 1; i++) {
                boolean curr = true;
                for (int j = 0; j < n - i - 1; j++) {
                    if (a[j]+1 < a[j + 1]) {
                        int temp = a[j];
                        a[j] = a[j + 1]-1;
                        a[j + 1] = temp;
                        curr = false;
                    }
                }
                if(curr) break;
            }
            StringBuilder res = new StringBuilder();
            for(int i: a) res.append(i);
            io.println(res);
        }
        io.close();
    }
    
    static class FastIO {
        BufferedReader br;
        PrintWriter pw;
        StringTokenizer st;

        public FastIO() {
            br = new BufferedReader(new InputStreamReader(System.in));
            pw = new PrintWriter(new BufferedOutputStream(System.out));
        }

        public FastIO(String inputFile, String outputFile) throws IOException {
            br = new BufferedReader(new FileReader(inputFile));
            pw = new PrintWriter(new BufferedWriter(new FileWriter(outputFile)));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }

        void print(Object obj) {
            pw.print(obj);
        }

        void println(Object obj) {
            pw.println(obj);
        }

        void close() {
            try {
                br.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            pw.close();
        }
    }
}


Solution 2 (runtime: 234 ms):
import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.StringTokenizer;



public class round991 {

static class Pair implements Comparable<Pair>{

int a;

long b;

String str;



Pair(int a,long b,String str){

this.a=a;

this.b=b;

this.str=str;

}



public int compareTo(Pair o) {

return Integer.compare(this.a, o.a); // Ascending order by a

}

//

//            public int compareTo(Pair o){

//                return Long.compare(this.b,o.b);

//            }

//

//            public int compareTo(Pair other) {

//                return this.str.compareTo(other.str); // Ascending order by str

//            }

//

}

static class FastReader {

BufferedReader br;

StringTokenizer st;



public FastReader() {

br = new BufferedReader(

new InputStreamReader(System.in));

}



String next() {

while (st == null || !st.hasMoreElements()) {

try {

st = new StringTokenizer(br.readLine());

} catch (IOException e) {

e.printStackTrace();

}

}

return st.nextToken();

}



int nextInt() {

return Integer.parseInt(next());

}



long nextLong() {

return Long.parseLong(next());

}



double nextDouble() {

return Double.parseDouble(next());

}



String nextLine() {

String str = "";

try {

if (st.hasMoreTokens()) {

str = st.nextToken("\n");

} else {

str = br.readLine();

}

} catch (IOException e) {

e.printStackTrace();

}

return str;

}

}

static ArrayList<Integer>[] gr;

public static void main(String[] args) {

FastReader sc = new FastReader();

PrintWriter out=new PrintWriter(System.out);

int t = sc.nextInt();

while (t != 0) {

t--;

String str=sc.next();

int[] arr=new int[str.length()];

for (int i = 0; i < arr.length; i++) {

arr[i]=str.charAt(i)-'0';

}

StringBuilder ans=new StringBuilder("");

for (int i = 0; i < arr.length; i++) {

int dig=arr[i];

int j=i-1;

while (j>=0 && arr[j]<dig-1){

arr[j+1]=arr[j];

--dig;

arr[j]=dig;

--j;

}

//                out.println(st);

}

//            out.println(Arrays.toString(arr));

for (int num:arr) {

ans.append(""+num);

}

out.println(ans);

}

out.flush();

}

}