Problem:
Score: 400 points

Problem Statement

There is a cave.

The cave has N rooms and M passages. The rooms are numbered 1 to N, and the passages are numbered 1 to M. Passage i connects Room A_i and Room B_i bidirectionally. One can travel between any two rooms by traversing passages. Room 1 is a special room with an entrance from the outside.

It is dark in the cave, so we have decided to place a signpost in each room except Room 1. The signpost in each room will point to one of the rooms directly connected to that room with a passage.

Since it is dangerous in the cave, our objective is to satisfy the condition below for each room except Room 1.

If you start in that room and repeatedly move to the room indicated by the signpost in the room you are in, you will reach Room 1 after traversing the minimum number of passages possible.

Determine whether there is a way to place signposts satisfying our objective, and print one such way if it exists.

Constraints

All values in input are integers.

2 \leq N \leq 10^5

1 \leq M \leq 2 \times 10^5

1 \leq A_i, B_i \leq N\ (1 \leq i \leq M)

A_i \neq B_i\ (1 \leq i \leq M)

One can travel between any two rooms by traversing passages.

Input

Input is given from Standard Input in the following format:

N M
A_1 B_1
:
A_M B_M

Output

If there is no way to place signposts satisfying the objective, print No.

Otherwise, print N lines. The first line should contain Yes, and the i-th line (2 \leq i \leq N) should contain the integer representing the room indicated by the signpost in Room i.

Sample Input 1

4 4
1 2
2 3
3 4
4 2

Sample Output 1

Yes
1
2
2

If we place the signposts as described in the sample output, the following happens:

Starting in Room 2, you will reach Room 1 after traversing one passage: (2) \to 1. This is the minimum number of passages possible.

Starting in Room 3, you will reach Room 1 after traversing two passages: (3) \to 2 \to 1. This is the minimum number of passages possible.

Starting in Room 4, you will reach Room 1 after traversing two passages: (4) \to 2 \to 1. This is the minimum number of passages possible.

Thus, the objective is satisfied.

Sample Input 2

6 9
3 4
6 1
2 4
5 3
4 6
1 5
6 2
4 5
5 6

Sample Output 2

Yes
6
5
5
1
1

If there are multiple solutions, any of them will be accepted.

Solution in Java (OpenJDK 1.8.0) (judge verdict: Time Limit Exceeded)



import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.*;

public class Main {
    static boolean[] vis;
    static List<Integer> list=new ArrayList<>();
    static int min=Integer.MAX_VALUE;
    static boolean[] visited;
    static int[] ans;
    static void dfs(LinkedList<Integer>[] lin,int src){
        if(src==1){
            if(list.size()<min) {
                visited=new boolean[ans.length];

                List<Integer> lis=new ArrayList<>();
                for(int j=0;j<list.size();j++){
                    //visited[list.get(j)]=true;
                    lis.add(list.get(j));
                }
                for(int j=0;j<lis.size();j++){
                    visited[lis.get(j)]=true;
                }
                min=lis.size();
                for(int j=0;j<lis.size()-1;j++){
                    ans[lis.get(j)]=lis.get(j+1);
                }
                //System.out.println(lis.get(lis.size()-1));

                int ss=lis.get(lis.size()-1);
                ans[ss]=1;
            }
            return;
        }
        if(list.size()>=min){
            return;
        }

        vis[src]=true;
        list.add(src);
        if(lin[src].contains(1)){
            dfs(lin,1);
            list.remove(list.size()-1);
            vis[src]=false;
            return;
        }
        for(Integer i:lin[src]){
            if(!vis[i]){
                dfs(lin,i);
            }
        }
        list.remove(list.size()-1);
        vis[src]=false;
    }


    public static void main(String[] args) throws IOException {
        Reader scanner=new Reader();
        int n= scanner.nextInt();
        int m=scanner.nextInt();
        LinkedList<Integer>[] lin=new LinkedList[n+1];
        for(int j=1;j<=n;j++){
            lin[j]=new LinkedList<>();
        }
        vis=new boolean[n+1];
        ans=new int[n+1];
        visited=new boolean[n+1];
        for(int j=0;j<m;j++){
            int a=scanner.nextInt();
            int b=scanner.nextInt();
            lin[a].add(b);
            lin[b].add(a);

        }
        Arrays.fill(ans,-1);
        list=new ArrayList<>();
        for(int j=n;j>1;j--){
           if(!visited[j]){
                vis=new boolean[n+1];
                list=new ArrayList<>();
                min=Integer.MAX_VALUE;
                dfs(lin,j);
            }
        }
       // StringBuilder stringBuilder=new StringBuilder();
        int ff=0;
        for(int j=2;j<ans.length;j++){
            if(ans[j]==-1){
                ff=1;
                break;
            }

        }
        if(ff==1){
            System.out.println("No");
        }
        else{
            System.out.println("Yes");
            for(int j=2;j<ans.length;j++){
                System.out.println(ans[j]);
            }
        }


    }


    static class Reader
    {
        final private int BUFFER_SIZE = 1 << 16;
        private DataInputStream din;
        private byte[] buffer;
        private int bufferPointer, bytesRead;

        public Reader()
        {
            din = new DataInputStream(System.in);
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public Reader(String file_name) throws IOException
        {
            din = new DataInputStream(new FileInputStream(file_name));
            buffer = new byte[BUFFER_SIZE];
            bufferPointer = bytesRead = 0;
        }

        public String readLine() throws IOException
        {
            byte[] buf = new byte[64]; // line length
            int cnt = 0, c;
            while ((c = read()) != -1)
            {
                if (c == '\n')
                    break;
                buf[cnt++] = (byte) c;
            }
            return new String(buf, 0, cnt);
        }

        public int nextInt() throws IOException
        {
            int ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do
            {
                ret = ret * 10 + c - '0';
            }  while ((c = read()) >= '0' && c <= '9');

            if (neg)
                return -ret;
            return ret;
        }

        public long nextLong() throws IOException
        {
            long ret = 0;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();
            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');
            if (neg)
                return -ret;
            return ret;
        }

        public double nextDouble() throws IOException
        {
            double ret = 0, div = 1;
            byte c = read();
            while (c <= ' ')
                c = read();
            boolean neg = (c == '-');
            if (neg)
                c = read();

            do {
                ret = ret * 10 + c - '0';
            }
            while ((c = read()) >= '0' && c <= '9');

            if (c == '.')
            {
                while ((c = read()) >= '0' && c <= '9')
                {
                    ret += (c - '0') / (div *= 10);
                }
            }

            if (neg)
                return -ret;
            return ret;
        }

        private void fillBuffer() throws IOException
        {
            bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
            if (bytesRead == -1)
                buffer[0] = -1;
        }

        private byte read() throws IOException
        {
            if (bufferPointer == bytesRead)
                fillBuffer();
            return buffer[bufferPointer++];
        }

        public void close() throws IOException
        {
            if (din == null)
                return;
            din.close();
        }
    }

}