1 /**************************************************************
  2     Problem: 2049
  3     User: Tunix
  4     Language: C++
  5     Result: Accepted
  6     Time:1920 ms
  7     Memory:1480 kb
  8 ****************************************************************/
  9  
 10 //BZOJ 2049
 11 #include<cstdio>
 12 #include<cstring>
 13 #include<cstdlib>
 14 #include<iostream>
 15 #include<algorithm>
 16 #define rep(i,n) for(int i=0;i<n;++i)
 17 #define F(i,j,n) for(int i=j;i<=n;++i)
 18 #define D(i,j,n) for(int i=j;i>=n;--i)
 19 using namespace std;
 20 const int N=10086;
 21  
 22 int c[N][2],fa[N],n,m,st[N<<1],top=0;
 23 bool rev[N];
 24  
 25 void Push_down(int x){
 26     int l=c[x][0],r=c[x][1];
 27     if (rev[x]){
 28         rev[x]^=1; rev[l]^=1; rev[r]^=1;
 29         swap(c[x][0],c[x][1]);
 30     }
 31 }
 32  
 33 bool isroot(int x){
 34     return c[fa[x]][0]!=x && c[fa[x]][1]!=x;
 35 }
 36  
 37 void rotate(int x){
 38     int y=fa[x],z=fa[y],l=c[y][1]==x,r=l^1;
 39     if (!isroot(y)) c[z][c[z][1]==y]=x;
 40     fa[x]=z; fa[y]=x; fa[c[x][r]]=y;
 41     c[y][l]=c[x][r]; c[x][r]=y;
 42 }
 43  
 44 void splay(int x){
 45     top=0; st[top++]=x;
 46     for(int y=x;!isroot(y);y=fa[y])
 47         st[top++]=fa[y];
 48     while(top--) Push_down(st[top]);
 49      
 50     while(!isroot(x)){
 51         int y=fa[x],z=fa[y];
 52         if (!isroot(y)){
 53             if(c[y][0]==x^c[z][0]==y) rotate(x);
 54             else rotate(y);
 55         }
 56         rotate(x);
 57     }
 58 }
 59  
 60 void access(int x){
 61     for(int t=0;x;t=x,x=fa[x])
 62         splay(x),c[x][1]=t;
 63 }
 64  
 65 void makeroot(int x){
 66     access(x); splay(x); rev[x]^=1;
 67 }
 68  
 69 int find(int x){
 70     access(x); splay(x);
 71     while(c[x][0]) x=c[x][0];
 72     return x;
 73 }
 74  
 75 void cut(int x,int y){
 76     makeroot(x);
 77     access(y);
 78     splay(y);
 79     if (c[y][0]==x) c[y][0]=fa[x]=0;
 80 }
 81  
 82 void link(int x,int y){
 83     makeroot(x); fa[x]=y;
 84 }
 85 //LCT end  
 86 int main(){
 87 //  freopen("input.txt","r",stdin);
 88     scanf("%d%d",&n,&m);
 89     char cmd[10];
 90     int x,y;
 91     F(i,1,m){
 92         scanf("%s%d%d",cmd,&x,&y);
 93         if (cmd[0]==‘C‘) link(x,y);
 94         else if (cmd[0]==‘D‘){
 95             if (find(x)==find(y)) cut(x,y);
 96         }
 97         else if (cmd[0]==‘Q‘){
 98             if (find(x)==find(y)) printf("Yes\n");
 99             else printf("No\n");
100         }
101     }
102     return 0;
103 }