abc31d_full.java

import java.io.IOException;
import java.io.InputStream;
import java.util.*;
 
public class Main {
 
    private static final double EPS = 1e-10;
 
 
    public static void main(String args[]) {
        FastScanner sc = new FastScanner();
        int k = sc.nextInt();
        int n = sc.nextInt();
 
        int[] width = new int[k];
 
        String[] v = new String[n];
        String[] w = new String[n];
 
        for (int i = 0; i < n; i++) {
            v[i] = sc.next();
            w[i] = sc.next();
        }
 
 
        int comb = Utils.pow(3, k);
        for (int i = 0; i < comb; i++) {    //幅の全組み合わせについて
            //幅の組み合わせを生成
            StringBuilder widthStr = new StringBuilder();
            widthStr.append(Integer.toString(i, 3));
            int strlen = widthStr.length();
            for (int j = 0; j < (k - strlen); j++) {
                widthStr.insert(0, '0');
            }
            for (int j = 0; j < k; j++) {
                width[j] = widthStr.charAt(j) - '0' + 1;
            }
            widthStr.setLength(0);
 
            //prepare
            String[] checker = new String[k];
            for (int j = 0; j < k; j++) {
                checker[j] = "";
            }
 
            //check
            boolean flag = true;
            widthcheck:
            for (int j = 0; j < n; j++) {//各数字と幅1-3の組み合わせ．v[j],w[j]について
                int index = 0;
                for (int l = 0; l < v[j].length(); l++) {   //1つの入力をチェック
                    int num = v[j].charAt(l) - '1';         //num-1
 
                    if ((index + width[num]) > w[j].length()) { //文字幅を超えないか
                        flag = false;
                        break widthcheck;
                    }
 
                    if (Objects.equals(checker[num], "")) { //矛盾してるか
                        checker[num] = w[j].substring(index, index + width[num]);
                    } else if (!Objects.equals(checker[num], w[j].substring(index, index + width[num]))) {
                            flag = false;
                            break widthcheck;
                    }
                    index += width[num];    //次の文字へ
                }
                if (index != (w[j].length())) {
                    flag = false;
                    break;
                }
 
            }
            if (flag) {
                for (String str : checker) {
                    System.out.println(str);
                }
                break;
            }
 
 
        }
 
    }
}
 
class Utils {
    public static int pow(int b, int k) throws IllegalArgumentException {
        if (k < 0)
            throw new IllegalArgumentException();
 
        switch (b) {
            case 0:
                return (k == 0) ? 1 : 0;
            case 1:
                return 1;
            case (-1):
                return ((k & 1) == 0) ? 1 : -1;
            case 2:
                return (k < Integer.SIZE) ? (1 << k) : 0;
            case (-2):
                if (k < Integer.SIZE) {
                    return ((k & 1) == 0) ? (1 << k) : -(1 << k);
                } else {
                    return 0;
                }
            default:
        }
        for (int accum = 1; ; k >>= 1) {
            switch (k) {
                case 0:
                    return accum;
                case 1:
                    return b * accum;
                default:
                    accum *= ((k & 1) == 0) ? 1 : b;
                    b *= b;
            }
        }
    }
}
 
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
 
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
 
    private int readByte() {
        if (hasNextByte()) return buffer[ptr++];
        else return -1;
    }
 
    private boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }
 
    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;
    }
 
    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }
 
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
 
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
 
    public int nextInt() {
        if (!hasNext()) throw new NoSuchElementException();
        int n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
}