在记录的同时记录与的距离
初始化为01
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using namespace std;
const int N=30050;
int fa[N],d[N],sz[N];
inline int read()
{
register int x=0,t=1;
register char ch=getchar();
while (ch!='-'&&(ch<'0'||ch>'9')) ch=getchar();
if (ch=='-') t=-1,ch=getchar();
while (ch>='0'&&ch<='9') x=x*10+ch-48,ch=getchar();
return x*t;
}
inline char get()
{
register char ch=getchar();
while (ch!='M'&&ch!='C') ch=getchar();
return ch;
}
int find(int x)
{
if (fa[x]==x) return x;
find(fa[x]);
d[x]+=d[fa[x]];
return fa[x]=find(fa[x]);
}
void unite(int u,int v) //u>>v
{
u=find(u),v=find(v);
fa[u]=v;
d[u]=d[v]+sz[v];
sz[v]+=sz[u];
}
int ask(int u,int v)
{
if (find(u)!=find(v)) return -1;
return abs(d[u]-d[v])-1;
}
void init()
{
for(int i=1;i<N;i++)
fa[i]=i,d[i]=0,sz[i]=1;
}
int main()
{
init();
int T=read();
while (T--)
{
char opt=get();
int u=read(),v=read();
if (opt=='M') unite(u,v);
if (opt=='C') printf("%d\n",ask(u,v));
}
return 0;
}