using System; using System.Collections.Generic; using System.Linq; using System.IO; using System.Globalization; using System.Diagnostics; using static System.Console; using Pair = System.Collections.Generic.KeyValuePair; class Program { static void Main() { SetOut(new StreamWriter(OpenStandardOutput()) { AutoFlush = false }); new Program().Solve(); Out.Flush(); } Scanner cin = new Scanner(); readonly int[] dd = { 0, 1, 0, -1, 0 }; readonly int mod = 1000000007; readonly string alfa = "abcdefghijklmnopqrstuvwxyz"; void Solve() { int N = cin.Nextint; int M = cin.Nextint; var G = Enumerable.Range(0, N).Select(i => new List()).ToArray();//頂点と辺 var W = Enumerable.Range(0, N).Select(i => new List()).ToArray();//頂点と頂点 for (int i = 0; i < M; i++) { int a = cin.Nextint, b = cin.Nextint; G[a].Add(i); G[b].Add(i); W[a].Add(b); W[b].Add(a); } var A = new int[N];//購入した頂点は1 var B = new int[M];//購入した辺は1 var cnt = 0; //購入した辺の数 //最後の頂点はは買わないので int high = N - 1; while (cnt < M) { while (A[high] == 1) high--; foreach (var v in W[high])//買う頂点番号 { if (A[v] == 1) continue; A[v] = 1; foreach (var z in G[v])//買う辺番号 { if (B[z] == 1) continue; B[z] = 1; cnt++; } } high--; } bool fl = false; for (int i = N - 1; i >= 0; i--) { if (fl) { Write(A[i]); } else { if (A[i] == 1) { i++; fl = true; } } } WriteLine(); } } class Scanner { string[] s; int i; char[] cs = new char[] { ' ' }; public Scanner() { s = new string[0]; i = 0; } public string[] Scan { get { return ReadLine().Split(); } } public int[] Scanint { get { return Array.ConvertAll(Scan, int.Parse); } } public long[] Scanlong { get { return Array.ConvertAll(Scan, long.Parse); } } public double[] Scandouble { get { return Array.ConvertAll(Scan, double.Parse); } } public string Next { get { if (i < s.Length) return s[i++]; string st = ReadLine(); while (st == "") st = ReadLine(); s = st.Split(cs, StringSplitOptions.RemoveEmptyEntries); i = 0; return Next; } } public int Nextint { get { return int.Parse(Next); } } public long Nextlong { get { return long.Parse(Next); } } public double Nextdouble { get { return double.Parse(Next); } } }