using System; using System.Collections.Generic; using System.Collections; using System.Collections.Specialized; using System.Linq; using System.Text; using System.IO; using System.Reflection; using static System.Math; using System.Numerics; using System.Threading; using System.Runtime.CompilerServices; using System.Diagnostics; static class Program { const long inf = long.MaxValue>>1; const int mod = 998244353; static Sc sc = new Sc(); static void Main() { Pt pt = new Pt(Solve); pt.Sm(); } static void Solve(Pt pt) { var (n,q)=sc.Tp2(); var m = n-1; var li = new List[n+1]; for(int i = 1;i<=n;i++) { li[i]=new List(); } for(int i = 0;i>1)-1)]-da.cd[da.Rt(e[1],(di>>1)-1)]; } else if(da.de[e[0]]>da.de[e[1]]) { c=da.Rt(e[0],di>>1); ans=da.de[c]-da.cd[da.Rt(e[0],(di>>1)-1)]; } else { c=da.Rt(e[1],di>>1); ans=da.de[c]-da.cd[da.Rt(e[1],(di>>1)-1)]; } pt.Wl(ans); } else { pt.Wl(0); } } } } public class Dlca { private bool[] b; private int[][] h; public readonly int[] de; private int o; private List[] li; public readonly List pe; public readonly int[] pa; public readonly int[] cd; public Dlca(List[] li,int pe) { this.li=li; int n = li.Length; o=(int)Log(n-1,2)+1; de=new int[n]; de[0]=-1; h=new int[o][]; b=new bool[n]; h[0]=new int[n]; pa=new int[n]; cd=new int[n]; this.pe=new List(); if(pe!=-1) { Fd1(pe,0,pe); this.pe.Add(pe); } else { for(int i = 1;i[] li,bool bo) : this(li,bo ? 1 : -1) { } private void Fd1(int a,int f,int p) { b[a]=true; de[a]=f; pa[a]=p; cd[a]=1; for(int i = 0;ide[b]) { int c = a; a=b; b=c; } for(int i = o-1;de[a]!=de[b];i--) { if(de[h[i][b]]>=de[a]) { b=h[i][b]; } } if(a==b) { return a; } for(int i = o-1;i>=0;i--) { if(h[i][a]!=h[i][b]) { a=h[i][a]; b=h[i][b]; } } return h[0][a]; } public int Di(int a,int b) { int l = Lca(a,b); return l!=0 ? de[a]+de[b]-(de[l]<<1) : int.MinValue; } public int Rt(int a,int b) { if((b&~((1< f) { f(this); } public void W(int s) { sb.Append(s); } public void W(long s) { sb.Append(s); } public void W(double s) { sb.Append(s); } public void W(decimal s) { sb.Append(s); } public void W(char s) { sb.Append(s); } public void W(string s) { sb.Append(s); } public void W(object s) { sb.Append(s); } public void W(params object[] s) { sb.Append(string.Join(" ",s)); } public void Wl(int s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(long s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(double s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(decimal s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(char s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(string s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(object s) { sb.Append(s).Append(Environment.NewLine); } public void Wl(int[] s) { sb.Append(string.Join(" ",s)).Append(Environment.NewLine); } public void Wl(long[] s) { sb.Append(string.Join(" ",s)).Append(Environment.NewLine); } public void Wl(double[] s) { sb.Append(string.Join(" ",s)).Append(Environment.NewLine); } public void Wl(string[] s) { sb.Append(string.Join(" ",s)).Append(Environment.NewLine); } public void Wl(params object[] s) { sb.Append(string.Join(" ",s)).Append(Environment.NewLine); } public void Wl() { sb.Append(Environment.NewLine); } public void Sm() { Console.Write(sb); } public void Op(StreamWriter sw) { sw.Write(sb); sw.Close(); } public static bool operator ==(Pt a,Pt b) { return a.sb.ToString()==b.sb.ToString(); } public static bool operator !=(Pt a,Pt b) { return a.sb.ToString()!=b.sb.ToString(); } public override bool Equals(object obj) { return false; } public override int GetHashCode() { return 0; } } public class Sc { [MethodImpl(MethodImplOptions.AggressiveInlining)] protected virtual string Rl() { return Console.ReadLine(); } [MethodImpl(MethodImplOptions.AggressiveInlining)] protected virtual string[] Sp(string st) { return st.Split(); } [MethodImpl(MethodImplOptions.AggressiveInlining)] private T Ct(string s) { return (T)Convert.ChangeType(s,typeof(T)); } public virtual int I { get { return int.Parse(Rl()); } } public virtual long L { get { return long.Parse(Rl()); } } public virtual double D { get { return double.Parse(Rl()); } } public virtual string S { get { return Rl(); } } public int[] Ia { get { return Array.ConvertAll(Sp(Rl()),int.Parse); } } public long[] La { get { return Array.ConvertAll(Sp(Rl()),long.Parse); } } public double[] Da { get { return Array.ConvertAll(Sp(Rl()),double.Parse); } } public string[] Sa { get { return Sp(Rl()); } } public object[] Oa { get { return Sp(Rl()); } } public int[] Ia2 { get { return Array.ConvertAll(Sp("0 "+Rl()+" 0"),int.Parse); } } public int[] Ia3(string a,string b) { return Array.ConvertAll(Sp(a+Rl()+b),int.Parse); } public int[] Ia3(int a) { return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),int.Parse); } public long[] La2 { get { return Array.ConvertAll(Sp("0 "+Rl()+" 0"),long.Parse); } } public long[] La3(string a,string b) { return Array.ConvertAll(Sp(a+Rl()+b),long.Parse); } public long[] La3(int a) { return Array.ConvertAll(Sp(Rl()+" "+a.ToString()),long.Parse); } public double[] Da2 { get { return Array.ConvertAll(Sp("0 "+Rl()+" 0"),double.Parse); } } public double[] Da3(string a,string b) { return Array.ConvertAll(Sp(a+Rl()+b),double.Parse); } public T[] Arr(int n,Func f) { var a = new T[n]; for(int i = 0;i(int n,Func f) { var a = new T[n]; for(int i = 0;i(int n,Func f) { var a = new T[n]; for(int i = 0;i(int n,Func f) { var a = new T[n]; for(int i = 0;i() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T, T, T) Tp3() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1]), Ct(s[2])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T, T, T, T) Tp4() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1]), Ct(s[2]), Ct(s[3])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T, T, T, T, T) Tp5() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1]), Ct(s[2]), Ct(s[3]), Ct(s[4])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T, T, T, T, T, T) Tp6() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1]), Ct(s[2]), Ct(s[3]), Ct(s[4]), Ct(s[5])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T1, T2) Tp2() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1])); } [MethodImpl(MethodImplOptions.AggressiveInlining)] public (T1, T1, T2) Tp3() { var s = Sp(Rl()); return (Ct(s[0]), Ct(s[1]), Ct(s[2])); } } public class Scr:Sc { private List li = new List(); private int l = 0; private bool bo = false; [MethodImpl(MethodImplOptions.AggressiveInlining)] protected override string Rl() { if(bo) { return li[l++%li.Count]; } li.Add(Console.ReadLine()); return li[li.Count-1]; } public void Again() { bo=true; } } public class Sc2:Sc { private string[] sps = new string[] { " "," ","\t" }; [MethodImpl(MethodImplOptions.AggressiveInlining)] protected override string[] Sp(string st) { return st.Split(sps,StringSplitOptions.RemoveEmptyEntries); } public override int I { get { return int.Parse(Sp(Rl())[0]); } } public override long L { get { return long.Parse(Sp(Rl())[0]); } } public override double D { get { return double.Parse(Sp(Rl())[0]); } } public override string S { get { return Sp(Rl())[0]; } } } public class Sct:Sc { private List li = new List(); private int l = 0; public void Add(int s) { li.Add(s.ToString()); } public void Add(long s) { li.Add(s.ToString()); } public void Add(double s) { li.Add(s.ToString()); } public void Add(string s) { li.Add(s.ToString()); } public void Add(object s) { li.Add(s.ToString()); } public void Add(int[] s) { li.Add(string.Join(" ",s)); } public void Add(long[] s) { li.Add(string.Join(" ",s)); } public void Add(double[] s) { li.Add(string.Join(" ",s)); } public void Add(string[] s) { li.Add(string.Join(" ",s)); } public void Add(object[] s) { li.Add(string.Join(" ",s)); } protected override string Rl() { return li[l++]; } public void Clear() { li.Clear(); l=0; } public void Again() { l=0; } public void Pf() { Console.WriteLine(string.Join("\n",li)); } }