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\u4ee3\u7801\u4ee5\u53ca\u4f8b\u9898<\/h2>\n

\u53ef\u80fd\u6709\u4e00\u4e9b\u6a21\u7248\u662f\u6ca1\u6709\u4f8b\u9898\u7684，\u6bd4\u5982\u53ef\u64a4\u9500\u5e76\u67e5\u96c6，\u56e0\u4e3a\u5b83\u4e3b\u8981\u7528\u4e8e\u7ebf\u6bb5\u6811\u5206\u6cbb，\u6211\u4e5f\u4e0d\u4f1a\u5199\u3002<\/p>\n

\u57fa\u7840\u5e76\u67e5\u96c6<\/p>\n

#include <bits\/stdc++.h>
\n#define int long long
\nusing namespace std;
\nconst int N=2e5+10;
\nint n,m,f[N],op,x,y,siz[N];
\nint fa(int x){
\nif(f[x]==x) return x;
\nelse return f[x]=fa(f[x]);
\n}
\nint read(){
\nchar c;int x=0,f=1;
\nwhile(c<'0'||c>'9'){c=getchar();if(c=='-') f=-1;}
\nwhile(c>='0'&&c<='9') x=x*10+c-'0',c=getchar();
\nreturn x*f;
\n}
\nsigned main(){
\nn=read(),m=read();
\nfor(int i=1;i<=n;i++) f[i]=i, siz[i]=1;
\nwhile(m–){
\nop=read(),x=read(),y=read();
\nif(op==1){
\nif(siz[fa(x)]<siz[fa(y)]) swap(x,y);
\nf[fa(y)]=fa(x),siz[x]+=siz[y];
\n}else{
\nif(fa(x)==fa(y)) printf("Y\\\\n");
\nelse printf("N\\\\n");
\n}
\n}
\nreturn 0;
\n} <\/p>\n

\u53ef\u64a4\u9500\u5e76\u67e5\u96c6（\u6ca1\u6709\u4f8b\u9898）<\/p>\n

#include <bits\/stdc++.h>
\n#define int long long
\nusing namespace std;
\nconst int N=1e5+10;
\nint n,f[N],siz[N],q,op,x,y;
\nstack<pair<int,int> >stk;
\nint fa(int x){
\nif(f[x]==x) return x;
\nelse return fa(f[x]);
\n}
\nsigned main(){
\ncin>>n>>q;
\nfor(int i=1;i<=n;i++) f[i]=i, siz[i]=1;
\nwhile(q–){
\ncin>>op;
\nif(op==1){
\ncin>>x>>y;
\nif(siz[fa(x)]<siz[fa(y)]) swap(x,y);
\nint X=fa(x),Y=fa(y);
\nstk.push({X,Y});
\nf[Y]=X, siz[X]+=siz[Y];
\n}else if(op==3){
\nx=stk.top().first, y=stk.top().second;
\nf[y]=y, siz[x]-=siz[y];
\n}else{
\ncin>>x>>y;
\nint X=fa(x),Y=fa(y);
\nif(X==Y) cout<<"Yes"<<'\\\\n';
\nelse cout<<"No"<<'\\\\n';
\n}
\n}
\nreturn 0;
\n} <\/p>\n

\u6269\u5c55\u57df\u5e76\u67e5\u96c6<\/p>\n

#include <bits\/stdc++.h>
\n#define int long long
\nusing namespace std;
\nconst int N=1e3+10;
\nint n,m,x,y,f[N],num[N],e[N],sl;
\nchar op;
\nint fa(int x){
\nif(f[x]==x) return x;
\nelse return f[x]=fa(f[x]);
\n}
\nsigned main(){
\ncin>>n>>m;
\nfor(int i=1;i<=n;i++) f[i]=i;
\nwhile(m–){
\ncin>>op>>x>>y;
\nif(op=='E'){
\nif(!e[x]) e[x]=y;
\nelse{
\nint a=fa(e[x]),b=fa(y);
\nif(num[a]<num[b]) swap(a,b);
\nf[b]=a,num[a]+=num[b];
\n}
\nif(!e[y]) e[y]=x;
\nelse{
\nint a=fa(e[y]),b=fa(x);
\nif(num[a]<num[b]) swap(a,b);
\nf[b]=a,num[a]+=num[b];
\n}
\n}else{
\nint a=fa(x),b=fa(y);
\nif(num[a]<num[b]) swap(a,b);
\nf[b]=a,num[a]+=num[b];
\n}
\n}
\nfor(int i=1;i<=n;i++) if(f[i]==i) sl++;
\ncout<<sl;
\nreturn 0;
\n}\/\/\u4ee3\u7801\u6bd4\u8f83\u6df7\u4e71，\u8fd9\u91cc\u7684e\u5c31\u662f\u7b2c\u4e8c\u500d\u7a7a\u95f4，\u8fd9\u79cd\u5199\u6cd5\u4e5f\u662f\u53ef\u4ee5\u7684，\u4f46\u5982\u679c\u6709\u5f88\u591a\u6761\u4ef6\u5c31\u5f88\u8d39\u52b2\u4e86 <\/p>\n

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