mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
126 lines
3.6 KiB
C++
126 lines
3.6 KiB
C++
#include <map>
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#include <stack>
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#include <queue>
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#include <math.h>
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#include <vector>
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#include <string>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <iostream>
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#include <algorithm>
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#define N 405
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#define M 4005
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#define E
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#define inf 0x3f3f3f3f
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#define dinf 1e10
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#define linf (LL)1<<60
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#define LL long long
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#define clr(a,b) memset(a,b,sizeof(a))
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using namespace std;
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LL mod;
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struct Edge
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{
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int a,b,c;
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bool operator<(const Edge & t)const
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{
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return c<t.c;
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}
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}edge[M];
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int n,m;
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LL ans;
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int fa[N],ka[N],vis[N];
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LL gk[N][N],tmp[N][N];
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vector<int>gra[N];
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int findfa(int a,int b[]){return a==b[a]?a:b[a]=findfa(b[a],b);}
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LL det(LL a[][N],int n)
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{
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for(int i=0;i<n;i++)for(int j=0;j<n;j++)a[i][j]%=mod;
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long long ret=1;
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for(int i=1;i<n;i++)
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{
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for(int j=i+1;j<n;j++)
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while(a[j][i])
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{
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LL t=a[i][i]/a[j][i];
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for(int k=i;k<n;k++)
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a[i][k]=(a[i][k]-a[j][k]*t)%mod;
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for(int k=i;k<n;k++)
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swap(a[i][k],a[j][k]);
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ret=-ret;
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}
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if(a[i][i]==0)return 0;
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ret=ret*a[i][i]%mod;
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}
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return (ret+mod)%mod;
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}
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int main()
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{
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while(scanf("%d%d%I64d",&n,&m,&mod)==3)
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{
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if(n==0 && m==0 && mod==0)break;
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memset(gk,0,sizeof(gk));
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memset(tmp,0,sizeof(tmp));
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memset(fa,0,sizeof(fa));
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memset(ka,0,sizeof(ka));
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memset(tmp,0,sizeof(tmp));
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for(int i=0;i<N;i++)gra[i].clear();
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for(int i=0;i<m;i++)
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scanf("%d%d%d",&edge[i].a,&edge[i].b,&edge[i].c);
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sort(edge,edge+m);
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for(int i=1;i<=n;i++)fa[i]=i,vis[i]=0;
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int pre=-1;
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ans=1;
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for(int h=0;h<=m;h++)
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{
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if(edge[h].c!=pre||h==m)
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{
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for(int i=1;i<=n;i++)
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if(vis[i])
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{
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int u=findfa(i,ka);
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gra[u].push_back(i);
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vis[i]=0;
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}
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for(int i=1;i<=n;i++)
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if(gra[i].size()>1)
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{
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for(int a=1;a<=n;a++)
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for(int b=1;b<=n;b++)
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tmp[a][b]=0;
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int len=gra[i].size();
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for(int a=0;a<len;a++)
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for(int b=a+1;b<len;b++)
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{
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int la=gra[i][a],lb=gra[i][b];
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tmp[a][b]=(tmp[b][a]-=gk[la][lb]);
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tmp[a][a]+=gk[la][lb];tmp[b][b]+=gk[la][lb];
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}
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long long ret=(long long)det(tmp,len);
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ret%=mod;
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ans=(ans*ret%mod)%mod;
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for(int a=0;a<len;a++)fa[gra[i][a]]=i;
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}
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for(int i=1;i<=n;i++)
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{
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ka[i]=fa[i]=findfa(i,fa);
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gra[i].clear();
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}
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if(h==m)break;
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pre=edge[h].c;
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}
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int a=edge[h].a,b=edge[h].b;
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int pa=findfa(a,fa),pb=findfa(b,fa);
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if(pa==pb)continue;
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vis[pa]=vis[pb]=1;
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ka[findfa(pa,ka)]=findfa(pb,ka);
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gk[pa][pb]++;gk[pb][pa]++;
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}
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int flag=0;
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for(int i=2;i<=n&&!flag;i++)if(ka[i]!=ka[i-1])flag=1;
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ans%=mod;
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printf("%I64d\n",flag?0:ans);
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}
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return 0;
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}
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