#include<bits/stdc++.h>
using namespace std;
using lll=__int128;
const int N=1e5+9;
int n,m,deg[N];
vector<int> G[N];
struct frac{
	lll x,y;
	frac(lll x,lll y):x(x),y(y){
		lll g=__gcd(x,y);
		x/=g,y/=g;
	}
	friend frac operator+(const frac &a,const frac &b){
		lll g=__gcd(a.y,b.y);
		lll y=a.y/g*b.y;
		return frac(y/a.y*a.x+y/b.y*b.x,y);
	}
	friend frac operator*(const frac &a,const frac &b){
		return frac(a.x*b.x,a.y*b.y);
	}
}f[N];
int main(){
#ifdef memset0
	freopen("A.in","r",stdin);
#endif
	cin.tie(0)->sync_with_stdio(0);
	cin>>n>>m;
	for(int k,i=1;i<=n;i++){
		cin>>k;
		a[i].resize(k);
		for(int &x:a[i]){
			cin>>x;
			deg[x]++;
		}
	}
	queue<int> q;
	for(int i=1;i<=n;i++)
		if(!deg[i]){
			q.push(i);
		}
	while(q.size()){
		int u=q.front();
		q.pop();
		frac t(f[u].x,f[u].y*G[u].size());
		for(int v:G[u]){
			--deg[v];
			f[v]+=t;
		}
	}
}

answer.code:21:5: error: no matching function for call to ‘frac::frac()’
   21 | }f[N];
      |     ^
answer.code:9:9: note: candidate: ‘frac::frac(lll, lll)’
    9 |         frac(lll x,lll y):x(x),y(y){
      |         ^~~~
answer.code:9:9: note:   candidate expects 2 arguments, 0 provided
answer.code:7:8: note: candidate: ‘constexpr frac::frac(const frac&)’
    7 | struct frac{
      |        ^~~~
answer.code:7:8: note:   candidate expects 1 argument, 0 provided
answer.code:7:8: note: candidate: ‘constexpr frac::frac(frac&&)’
answer.code:7:8: note:   candidate expects 1 argument, 0 provided
answer.code: In function ‘int main()’:
answer.code:30:17: error: ‘a’ was not declared in this scope
   30 |                 a[i].resize(k);
      |                 ^
answer.code:47:29: error: no match for ‘operator+=’ (operand types are ‘frac’ and ‘frac’)
   47 |                         f[v]+=t;
      |                         ~~~~^~~