77 lines
2.2 KiB
C++
77 lines
2.2 KiB
C++
#include<iostream>
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#include<map>
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#include<string.h>
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using namespace std;
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#define N 35
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#define FF(i,n) for(int i=0;i<n;i++)
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int ans[N];
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int init[N][N];
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void matrixMul(int a[][N],int b[][N],int n,int mod){
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int i,j,k;
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int buf[N][N]={0};
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FF(i,n)FF(k,n) if(a[i][k])FF(j,n)if(b[k][j])
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buf[i][j]=(buf[i][j]+a[i][k]*b[k][j])%mod;
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FF(i,n)FF(j,n) a[i][j]=buf[i][j];
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}
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void matrixMul(int a[],int b[][N],int n,int mod){
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int i,j;
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int buf[N]={0};
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FF(i,n)FF(j,n)
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buf[i]=(buf[i]+a[j]*b[i][j])%mod;
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FF(i,n) a[i]=buf[i];
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}
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void matrixMul(int ans[],int init[][N],int n,int m,int mod){
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for(;m;m>>=1){
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if(m&1) matrixMul(ans,init,n,mod);
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matrixMul(init,init,n,mod);
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}
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}
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int main(void){
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int t;
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int i,j,k,n,mod;
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int Map[N][N];
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n=30;
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mod=2008;
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while(~scanf("%d",&t)){
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int a,b;
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int ind=0;
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map<int,int> M;
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memset(Map,0,sizeof(Map));
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while(t--){
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scanf("%d%d",&a,&b);
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if(M.find(a)==M.end())
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M[a]=ind++;
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if(M.find(b)==M.end())
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M[b]=ind++;
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Map[M[b]][M[a]]++;
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}
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scanf("%d",&t);
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while(t--){
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int v1,v2;
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int t1,t2;
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scanf("%d%d%d%d",&v1,&v2,&t1,&t2);
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if(M.find(v1)==M.end()||M.find(v2)==M.end()||(t1==0&&t2==0)){
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printf("0\n");
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continue;
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}
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memset(ans,0,sizeof(ans));
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ans[M[v1]]=1;
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int ret;
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if(t1==0)
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ret=0;
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else{
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FF(j,M.size())FF(k,M.size()) init[j][k]=Map[j][k];
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matrixMul(ans,init,M.size(),t1,mod);
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ret=ans[M[v2]]%mod;
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}
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t1++;
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for(;t1<=t2;t1++){
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FF(i,M.size())FF(j,M.size()) init[i][j]=Map[i][j];
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matrixMul(ans,init,M.size(),1,mod);
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ret=(ret+ans[M[v2]])%mod;
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}
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printf("%d\n",ret);
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}
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}
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}
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