Ruudukko

public class Q3 {
    
    static IO io = new IO();
    static int n;
    static char[][] table;
    static String[][] metaTable;
    static String ans = "";
    
    public static void main(String[] fuckingCopyRightBreaker){
        
        
        n = io.nextInt();
        
        table = new char[n][n];
        metaTable = new String[n][n];
        
        for(int i = 0; i < n; i++){
            table[i] = io.next().toCharArray();
        }
        
        io.print(goTo(0, 0));
        
        io.close();
    }
    
    
    private static String goTo(int x, int y){
        
        
        
        if(String.valueOf(metaTable[x][y]).equals("null")){
            if(x == n - 1 && y == n - 1){

                metaTable[x][y] = Character.toString(table[x][y]);

            }else if(x == n - 1){

                metaTable[x][y] = table[x][y] + goTo(x, y + 1);

            }else if(y == n - 1){

                metaTable[x][y] = table[x][y] + goTo(x + 1, y);

            }else{
                if((int)table[x + 1][y] == (int)table[x][y + 1]){

                    String s1 = goTo(x + 1, y);
                    String s2 = goTo(x, y + 1);

                    if(s1.compareTo(s2) <= 0){
                        metaTable[x][y] = table[x][y] + s1;
                    }else{
                        metaTable[x][y] = table[x][y] + s2;
                    }

                }else if((int)table[x + 1][y] < (int)table[x][y + 1]){

                    metaTable[x][y] = table[x][y] + goTo(x + 1, y);

                }else{

                    metaTable[x][y] = table[x][y] + goTo(x, y + 1);

                }
            }
        }
        return metaTable[x][y];
    }
    
    
    
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED