Problem:
Score : 500 points

Problem Statement

There is a rooted tree (see Notes) with N vertices numbered 1 to N.
Each of the vertices, except the root, has a directed edge coming from its parent.
Note that the root may not be Vertex 1.

Takahashi has added M new directed edges to this graph.
Each of these M edges, u \rightarrow v, extends from some vertex u to its descendant v.

You are given the directed graph with N vertices and N-1+M edges after Takahashi added edges.
More specifically, you are given N-1+M pairs of integers, (A_1, B_1), ..., (A_{N-1+M}, B_{N-1+M}), which represent that the i-th edge extends from Vertex A_i to Vertex B_i.

Restore the original rooted tree.

Notes

For "tree" and other related terms in graph theory, see the article in Wikipedia, for example.

Constraints

3 \leq N

1 \leq M

N + M \leq 10^5

1 \leq A_i, B_i \leq N

A_i \neq B_i

If i \neq j, (A_i, B_i) \neq (A_j, B_j).

The graph in input can be obtained by adding M edges satisfying the condition in the problem statement to a rooted tree with N vertices.

Input

Input is given from Standard Input in the following format:

N M
A_1 B_1
:
A_{N-1+M} B_{N-1+M}

Output

Print N lines.
In the i-th line, print 0 if Vertex i is the root of the original tree, and otherwise print the integer representing the parent of Vertex i in the original tree.

Note that it can be shown that the original tree is uniquely determined.

Sample Input 1

3 1
1 2
1 3
2 3

Sample Output 1

0
1
2

The graph in this input is shown below:

It can be seen that this graph is obtained by adding the edge 1 \rightarrow 3 to the rooted tree 1 \rightarrow 2 \rightarrow 3.

Sample Input 2

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

Sample Output 2

6
4
2
0
6
2

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class Program
    {
    static void Main(string[] args)
        {
        string[] temp=System.Console.ReadLine().Split(' ');
        int N_EdgeNum = int.Parse(temp[0]);
        int M_NewArcNum = int.Parse(temp[1]);
        int ArcNum = N_EdgeNum - 1 + M_NewArcNum;
        List<int>[] upper =Enumerable.Range(0, N_EdgeNum + 1).Select(_ => new List<int>()).ToArray();
        List<int>[] lower = Enumerable.Range(0, N_EdgeNum + 1).Select(_ => new List<int>()).ToArray();
        bool[] hasparent = new bool[N_EdgeNum + 1];
        for (int i = 0; i < ArcNum; i++)
        {
            temp = Console.ReadLine().Split(' ');
            var a = int.Parse(temp[0]);
            var b = int.Parse(temp[1]);
            upper[b].Add(a);
            lower[a].Add(b);
        }
        int root = Enumerable.Range(1, N_EdgeNum).First(x => upper[x].Count == 0);
        Queue<int> queue = new Queue<int>();
        queue.Enqueue(root);
        while (queue.Count > 0)
        {
            var p = queue.Dequeue();
            foreach (var child in lower[p])
            {
                if (upper[child].Count == 1)
                {
                    queue.Enqueue(child);
                }
                else
                {
                    upper[child].Remove(p);
                }
            }
        }
        upper[root].Add(0);
        var answer = string.Join(Environment.NewLine, upper.Skip(1).Select(u => u[0]));
        Console.WriteLine(answer);
    }
    }