#include<bits/stdc++.h> using namespace std; const int N=1e6+10; int ans; int boom,x,y; int total,totalju; int fa[N*3]; int find(int x) { if(x!=fa[x]) { fa[x]=find(fa[x]); } return fa[x]; }
void together(int x,int y) { x=find(x); y=find(y); if(x!=y) fa[y]=x; }
int main() { cin>>total>>totalju; //对于每种生物：设 x 为本身，x+total为猎物，x+2*total为天敌 if(totalju==0) { ans=0; cout<<ans; return 0; }
for(int i=1;i<=total*3;i++)
{
fa[i]=i;
}
for(int i=1;i<=totalju;i++)
{
int boom,x,y;
cin>>boom>>x>>y;
if(x>total || y>total)
{
ans++;
continue;
}
if(boom==1)
{
if(find(x+total)==find(y) || find(x+total*2)==find(y))
{
ans++;
continue;
}
together(x,y);
together(x+total,y+total);
together(x+total*2,y+total*2);
}
else if(boom==2)
{
if(find(x)==find(y) || find(x+total*2)==find(y))
{
ans++;
continue;
}
together(x,y+total*2);
together(x+total,y);
together(x+total*2,y+total);
}
}
cout<<ans;
}
共 1 条回复
建议添加上 return 0；