http://poj.org/problem?id=1977 #include<iostream> #include"string.h" using namespace std; char m[30][100][100]; int n,t,v[100]; char name[100][100][100]; char nm[100][100]; int s[100]; char ans[100][100]; char temp[100][100]; void multiply(char a[100][100],char b[100][100],char c[100][100]) { int i,j,k; for(i=0;i<n;i++) for(j=0;j<n;j++) { c[i][j]=0; for(k=0;k<n;k++) c[i][j]+=a[i][k]*b[k][j]; c[i][j]%=2; } return; } void init() { int i,j,k; cin>>n>>t; for(i=0;i<n;i++) for(j=0;j<n;j++) m[0][i][j]=0; for(i=0;i<n;i++) m[0][i][i]++; for(i=0;i<n;i++) { cin>>nm[i]; cin>>v[i]; v[i]%=2; cin>>s[i]; for(j=0;j<s[i];j++) cin>>name[i][j]; } for(i=0;i<n;i++) for(j=0;j<s[i];j++) { for(k=0;k<n;k++) if(strcmp(nm[k],name[i][j])==0)break; m[0][i][k]++; m[0][i][k]%=2; } t--; for(i=1;(1<<i)<=t;i++) { multiply(m[i-1],m[i-1],m[i]); } for(i=0;i<n;i++) for(j=0;j<n;j++) ans[i][j]=0; for(i=0;i<n;i++) ans[i][i]=1; for(i=0;t;i++) { if(t%2) { multiply(ans,m[i],temp); for(j=0;j<n;j++) for(k=0;k<n;k++) ans[j][k]=temp[j][k]; } t/=2; } } int main() { int cas,i,j,an[100],answer; cin>>cas; while(cas--) { init(); for(i=0;i<n;i++) { an[i]=0; for(j=0;j<n;j++) an[i]+=v[j]*ans[j][i]; an[i]%=2; } answer=0; for(i=0;i<n;i++) answer+=an[i]; cout<<answer<<endl; } return 0; }
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