mirror of
https://github.com/Kiritow/OJ-Problems-Source.git
synced 2024-03-22 13:11:29 +08:00
83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
#include <stdio.h>
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#include <string.h>
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#include <iostream>
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#include <algorithm>
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#include <vector>
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#include <queue>
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#include <set>
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#include <map>
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#include <string>
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#include <math.h>
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#include <stdlib.h>
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#include <time.h>
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#include <iomanip>
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using namespace std;
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typedef long long ll;
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const ll mod=998244353;
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bool a[1000][1000];
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int n,m,au[1000][9],p[1000][1000],ee,fa[900],num[900];
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ll two[1000];
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struct edge {
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int x,y,next;
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}e[8888888];
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void addedge(int x,int y,int u,int v) {
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if(x==y) return;
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if(x>y) {x=x^y;y=x^y;x=x^y;}
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e[ee].x=u;e[ee].y=v;e[ee].next=p[x][y];p[x][y]=ee++;
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}
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void init() {
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int i,j,k,x,y;
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queue<int> qx,qy;ee=0;
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for(i=1;i<=n;i++) {fa[i]=i;num[i]=1;}
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for(i=1;i<n;i++)
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for(j=i+1;j<=n;j++)
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for(k=1;k<=m;k++)
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addedge(au[i][k],au[j][k],i,j);
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for(i=1;i<=n;i++) {
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a[0][i]=true;qx.push(0);qy.push(i);
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}
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while (!qx.empty()) {
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i=qx.front();j=qy.front();qx.pop();qy.pop();
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k=p[i][j];
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while(k!=-1) {
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x=e[k].x;y=e[k].y;
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if(a[x][y]) {k=e[k].next;continue;}
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else {
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a[x][y]=true;
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qx.push(e[k].x);qy.push(e[k].y);
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}
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}
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}
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}
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int find_fa(int u) {
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if(u==fa[u]) return u;
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return fa[u]=find_fa(fa[u]);
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}
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ll cal () {
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int i,j;ll ans=two[n]-1;
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for(i=1;i<n;i++) for(j=i+1;j<=n;j++) {
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if(!a[i][j]&&find_fa(i)!=find_fa(j)) {
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num[find_fa(i)]+=num[find_fa(j)];
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fa[fa[j]]=fa[i];
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}
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}
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for(i=1;i<=n;i++) {
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if(i==fa[i]) {
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ans=(ans+mod-two[num[i]]+1)%mod;
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}
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}
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return ans;
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}
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int main ()
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{
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int i,j;
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two[0]=1;for(i=1;i<=900;i++) two[i]=2*two[i-1]%mod;
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while(~scanf("%d%d",&n,&m)) {
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for(i=1;i<=n;i++) for(j=1;j<=m;j++) scanf("%d",&au[i][j]);
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memset(a,false,sizeof(a));
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for(i=0;i<n;i++) for(j=i+1;j<=n;j++) p[i][j]=-1;
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init();
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printf("%I64d\n",cal());
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}
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}
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