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#include <iostream> #include <cstdio> #include <vector> #include <queue> #include <sstream> #include <string> #include <cstring> #include <cmath> using namespace std; int n,d,s; int BusStartAtStop[51]; int BusRunAtRoad[51]; int gr[31][31]; bool visit[51][51]; vector<int> vRoadstops[21]; vector<int> vBusRunAtRoad[21]; void init() { for(int i=0;i<51;i++) { BusStartAtStop[i]=0; BusRunAtRoad[i]=0; } for(int i=0;i<31;i++) for(int j=0;j<31;j++) gr[i][j]=0; for(int i=0;i<21;i++) { vRoadstops[i].clear(); vBusRunAtRoad[i].clear(); } } void floydwarshall() { for(int k=1;k<=d;k++) { for(int i=1;i<=d;i++) { for(int j=1;j<=d;j++) { gr[i][j] = gr[i][j] | (gr[i][k] & gr[k][j]); } } } } bool bfs(int bus1,int bus2) { int stop1,stop2; int nxtStop1,nxtStop2; int root1=BusRunAtRoad[bus1],root2=BusRunAtRoad[bus2]; queue<int> q; memset(visit,false,sizeof(visit)); q.push(BusStartAtStop[bus1]); q.push(BusStartAtStop[bus2]); visit[BusStartAtStop[bus1]][BusStartAtStop[bus2]]=1; while(!q.empty()) { stop1 = q.front();q.pop(); stop2 = q.front();q.pop(); if(stop1==stop2) return 1; for(int i=0;i<vRoadstops[root1].size();i++) { if(vRoadstops[root1][i]==stop1) { nxtStop1 = vRoadstops[root1][(i+1)%vRoadstops[root1].size()]; break; } } for(int i=0;i<vRoadstops[root2].size();i++) { if(vRoadstops[root2][i]==stop2) { nxtStop2 = vRoadstops[root2][(i+1)%vRoadstops[root2].size()]; break; } } if(!visit[nxtStop1][nxtStop2]) { visit[nxtStop1][nxtStop2]=1; q.push(nxtStop1); q.push(nxtStop2); } } return 0; } int main() { string st; int a,b; bool f; int val,start,bus,ret; stringstream ss; while(getline(cin,st)) { ss.clear(); ss<<st; ss>>n; ss>>d; ss>>s; if(n+d+s==0) break; init(); for(int i=1;i<=n;i++) { ss.clear(); getline(cin,st); ss<<st; while(ss>>val) { vRoadstops[i].push_back(val); } ss.clear(); getline(cin,st); ss<<st; while(ss>>start>>bus) { BusStartAtStop[bus]=start; BusRunAtRoad[bus]=i; vBusRunAtRoad[i].push_back(bus); } } for(int i=1;i<=d;i++) { for(int j=i+1;j<=d;j++) { if(bfs(i,j)==1) gr[i][j]=1,gr[j][i]=1; } gr[i][i]=1; } floydwarshall(); f =1; for(int i=1;i<=d;i++) { for(int j=1;j<=d;j++) { if(gr[i][j]==0) f=0; } if(f==0) break; } if(f) printf("Yes\n"); else printf("No\n"); } return 0; } |