QOJ.ac

QOJ

IDProblemSubmitterResultTimeMemoryLanguageFile sizeSubmit timeJudge time
#86632#5407. 基础图论练习题2805734199h0 0ms0kbC++143.6kb2023-03-10 14:33:362023-03-10 14:33:39

Judging History

This is the latest submission verdict.

  • [2023-08-10 23:21:45]
  • System Update: QOJ starts to keep a history of the judgings of all the submissions.
  • [2023-03-10 14:33:39]
  • Judged
  • Verdict: 0
  • Time: 0ms
  • Memory: 0kb
  • [2023-03-10 14:33:36]
  • Submitted

answer

#include <bits/stdc++.h>
#define N 5005
#define M 13000005
using namespace std;
const int mod=1e9+7;
int power(int x,int y) {
	int ans=1;
	while(y) {
		if(y&1) ans=1ll*ans*x%mod;
		x=1ll*x*x%mod,y>>=1;
	}
	return ans;
}
int n,ans,tot,first[N],nxt[M],ver[M],pw2[N],pw[N];
void add(int s,int e) {
	nxt[++tot]=first[s];
	first[s]=tot;
	ver[tot]=e;
}
int dfn[N],totd,low[N],s[N],top,totb,blo[N];
vector<int> b[N];
void tarjan(int now,int fa) {
	dfn[now]=low[now]=++totd;
	s[++top]=now;
	for(int i=first[now];i;i=nxt[i]) {
		int v=ver[i];
		if(v==fa||blo[v]) continue;
		if(dfn[v]) low[now]=min(low[now],dfn[v]);
		else {
			tarjan(v,now);
			low[now]=min(low[now],low[v]);
		}
	}
	if(low[now]>=dfn[now]) {
		blo[now]=++totb;
		b[totb].push_back(now);
		while(top&&s[top]!=now) {
			b[totb].push_back(s[top]);
			blo[s[top--]]=totb;
		}
		if(top) top--;
	}
}
int ind[N],oud[N],deg[N][N],wou[N],win[N];
vector<int> head[N],hb[N],hbin[N];
void build() {
	for(int i=1;i<=n;++i) for(int j=first[i];j;j=nxt[j]) {
		if(blo[i]==blo[ver[j]]) {
			hb[i].push_back(ver[j]);
			hbin[ver[j]].push_back(i);
		} else {
			head[blo[i]].push_back(blo[ver[j]]);
			deg[blo[i]][blo[ver[j]]]++;
			ind[blo[ver[j]]]++;
		}
	}
}
int dep[N],q[N+10],l,r;
void bfs() {
	l=1,r=0;
	for(int i=1;i<=totb;++i) {
		if(!ind[i]) q[++r]=i;
	}
	while(l<=r) {
		int u=q[l++],sz;
		sz=head[u].size();
		for(int i=0,v;i<sz;++i) {
			v=head[u][i];
			ind[v]--;
			if(!ind[v]) {
				dep[v]=dep[u]+1;
				q[++r]=v;
			}
		}
	}
}
bool vis[N];
string str;
int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	cin>>n;
	pw[0]=1;
	for(int i=1;i<=n;++i) {
		pw[i]=(pw[i-1]<<1)%mod;
		if(i>1) pw2[i]=power(2,(i-1)*(i-2)>>1);
	}
	for(int i=2,j,k,c,ed;i<=n;++i) {
		cin>>str;
		for(j=0;j<(i-1)/4+1;++j) {
			ed=i-1-(j<<2);
			c=isdigit(str[j])?str[j]-'0':str[j]-'A'+10;
			for(k=0;k<4&&k<ed;++k) {
				((c>>k)&1)?add(i,(j<<2)+k+1):add((j<<2)+k+1,i);
			}
		}
	}
	for(int i=1;i<=n;++i) {
		if(!blo[i]) tarjan(i,0);
	}
	build();
	bfs();
	for(int i=1;i<=n;++i) {
		oud[i]=hb[i].size();
		ind[i]=hbin[i].size();
	}
	for(int i=1;i<=n;++i) {
		if(oud[i]==1) {
			wou[i]=1;
			for(int j=0;j<ind[i];++j) {
				if(oud[hbin[i][j]]==1) wou[i]++;
			}
		}
		if(ind[i]==1) {
			win[i]=1;
			for(int j=0;j<oud[i];++j) {
				if(ind[hb[i][j]]==1) win[i]++;
			}
		}
	}
	for(int i=1,u,v,res;i<=n;++i) {
		u=blo[i];
		for(int j=first[i];j;j=nxt[j]) {
			v=ver[j];
			if(u!=blo[v]) {
				if(dep[u]<dep[blo[v]]-1||deg[u][blo[v]]>1) {
					res=totb-dep[blo[v]]+dep[u];
				} else res=totb;
			} else {
				int sz;
				if(oud[i]==1&&ind[v]==1) {
					res=2,l=1,r=0;
					vis[i]=vis[v]=1;
					q[++r]=i;q[++r]=v;
					while(l<=r) {
						int x=q[l++],y;
						sz=hb[x].size();
						for(int k=0;k<sz;++k) {
							y=hb[x][k];
							ind[y]--;
							if(!ind[y]&&!vis[y]) res++,vis[y]=1,q[++r]=y;
						}
						sz=hbin[x].size();
						for(int k=0;k<sz;++k) {
							y=hbin[x][k];
							oud[y]--;
							if(!oud[y]&&!vis[y]) res++,vis[y]=1,q[++r]=y;
						}
					}
					sz=b[u].size();
					for(int k=0;k<sz;++k) {
						vis[b[u][k]]=0;
						oud[b[u][k]]=hb[b[u][k]].size();
						ind[b[u][k]]=hbin[b[u][k]].size();
					}
					if(res<sz) res+=totb;
					else res+=totb-1;
				} else res=totb+wou[i]+win[v];
//				cout<<"totb = "<<totb<<" "<<"res = "<<res<<"woui = "<<wou[i]<<"winv = "<<win[v]<<"\n";
			}
//			printf("j = %d res = %d\n",j,res);
//			printf("i = %d v = %d woui = %d winv = %d res = %d\n",i,v,wou[i],win[v],res);
			ans=(ans+1ll*pw2[max(i,v)]*pw[min(i,v)-1]%mod*res)%mod;
		}
	}
	cout<<ans<<"\n";
	return 0;
}

Details

Tip: Click on the bar to expand more detailed information

Subtask #1:

score: 0
Runtime Error

Test #1:

score: 0
Runtime Error

input:

10000
100
1
2
2
8
C0
F0
27
78
AE1
C01
511
D87
EF20
3873
2742
73D0
DC9B0
FB2A3
9C011
9B4E0
95DC00
A7B980
F43531
6A6245
5347BE0
1A6C8A1
88E46D6
64CF3AE
D25F63C1
C894E4C3
1C0AFD73
EC1C3F9A
087CE17C0
22149A380
B28038AF1
B9CA21C7F
D78F5307C1
49045489A2
72C4DE6FD1
7713F40D05
EEE8878EEC1
310E62812B1
DA9D5B...

output:


result:


Subtask #2:

score: 0
Skipped

Dependency #1:

0%

Subtask #3:

score: 0
Skipped

Dependency #1:

0%

Subtask #4:

score: 0
Skipped

Dependency #1:

0%

Subtask #5:

score: 0
Skipped

Dependency #1:

0%