delete pics to save space

1.2024.cpp

@@ -0,0 +1,54 @@
+#include<cstdio>
+#include<cstring>
+#include<algorithm>
+using namespace std;
+const int maxn=50005;
+int n,m,fa[maxn*3];
+inline int ff(int u)
+{
+	int a=u,b;
+	while(u!=fa[u]) u=fa[u];
+	while(a!=u)
+	{
+		b=fa[a];
+		fa[a]=u;
+		a=b;
+	}
+	return u;
+}
+inline void merge(int x,int y)
+{
+	x=ff(x); y=ff(y);
+	if(x!=y) fa[x]=y;
+}
+int main()
+{
+#ifdef local
+	freopen("pro.in","r",stdin);
+#endif
+	scanf("%d%d",&n,&m);
+	int res=0;
+	for(int i=3;i<=n*3+2;i++) fa[i]=i;
+	while(m-->0)
+	{
+		int d,x,y; scanf("%d%d%d",&d,&x,&y);
+		int Xself=x*3,Xeat=x*3+1,Xenemy=x*3+2;
+		int Yself=y*3,Yeat=y*3+1,Yenemy=y*3+2;
+		if(x>n||y>n||(d==2&&x==y)) { res++; goto nxt; }
+		if(d==1)
+		{
+			if(ff(Xeat)==ff(Yself)) { res++; goto nxt; }
+			if(ff(Yeat)==ff(Xself)) { res++; goto nxt; }
+			merge(Xeat,Yeat); merge(Xself,Yself); merge(Xenemy,Yenemy);
+		}
+		else
+		{
+			if(ff(Xself)==ff(Yself)) { res++; goto nxt; }
+			if(ff(Xself)==ff(Yeat)) { res++; goto nxt; }
+			merge(Xeat,Yself); merge(Xself,Yenemy); merge(Xenemy,Yeat);
+		}
+		nxt:;
+	}
+	printf("%d\n",res);
+	return 0;
+}