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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#182855 | #5407. 基础图论练习题 | FLY | 0 | 0ms | 0kb | C++14 | 4.4kb | 2023-09-18 17:19:34 | 2023-09-18 17:19:34 |
answer
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define For(i,a,b) for(int i=(a);i<=(b);i++)
#define dFor(i,a,b) for(int i=(a);i>=(b);i--)
#define abs_(x) max(x,-(x))
#define tomin(x,y) x=min(x,y)
#define tomax(x,y) x=max(x,y)
#define eq(x,y) (abs_((x)-(y))<=eps)
#define db double
#define pw(x) ((x)*(x))
#define y1 __
#define vci vector<int>
#define pb push_back
#define all(x) x.begin(),x.end()
constexpr int N=5e3+5,P=1e9+7;
int read()
{
int x=0,y=1;
char c=getchar();
for(;!isdigit(c);c=getchar()) if(c=='-') y=0;
for(;isdigit(c);c=getchar()) x=(x<<3)+(x<<1)+(c^48);
return y?x:-x;
}
char getc()
{
char c=getchar();
for(;!isdigit(c)&&!isalpha(c);c=getchar()) ;
return c;
}
int turn(char t)
{
if(isdigit(t)) return t-'0';
return t-'A'+10;
}
int n;
bool e[N][N];
vector<int> scc[N];
vector<int> e2[N];
int bel[N];
int stk[N],dfn[N],low[N],tot,ct,ct2;
bool vs[N];
int ans[N][N];
void tarjan(int u)
{
// cout<<"<<"<<u<<" "<<dfn[u]<<endl;
vs[u]=1;
dfn[u]=low[u]=++tot;
stk[++ct]=u;
For(v,1,n) if(e[u][v])
{
if(!dfn[v]) { tarjan(v); low[u]=min(low[u],low[v]); }
else if(vs[v]) low[u]=min(low[u],low[v]);
}
if(low[u]==dfn[u])
{
ct2++;
do
{
int v=stk[ct--];
vs[v]=0;
bel[v]=ct2;
scc[ct2].pb(v);
}while(stk[ct+1]!=u);
}
}
int cid[N];
int rd[N];
int q[N];
int Sum;
void tarjan2(int u)
{
vs[u]=1;
dfn[u]=low[u]=++tot;
stk[++ct]=u;
For(v,1,n) if(e[u][v])
{
if(!dfn[v]) { tarjan2(v); low[u]=min(low[u],low[v]); }
else if(vs[v]) low[u]=min(low[u],low[v]);
}
if(low[u]==dfn[u])
{
ct2++;
do
{
int v=stk[ct--];
vs[v]=0; Sum++;
}while(stk[ct+1]!=u);
}
}
void cls()
{
tot=ct=ct2=0;
memset(vs,0,n+2);
memset(dfn,0,n+2<<2);
}
void solve(vector<int> nw)
{
int sz=nw.size();
// cout<<" "<<sz<<endl;
// For(i,0,sz-1) cout<<nw[i]<<" "; puts("");
vector<int> h;
for(int u:nw)
{
if(h.empty()) { h.pb(u); continue; }
if(e[u][h[0]]) { h.insert(h.begin(),u); }
if(e[h.back()][u]) { h.pb(u); continue; }
for(int i=0;;i++)
{
if(e[h[i]][u]&&e[u][h[i+1]])
{
h.insert(h.begin()+i+1,u);
break;
}
}
}
// for(int u:h) cout<<u<<" "; puts("");
int t=0;
if(sz==1) goto ok;
for(int i=1;;i++)
{
if(e[h[i]][h[0]]) { t=i; break; }
}
for(int i=t+1;i<sz;i++)
{
For(j,0,t)
{
if(e[h[i]][h[j]])
{
vector<int> ls;
For(l,j,t) ls.pb(h[l]);
For(l,0,j-1) ls.pb(h[l]);
For(l,t+1,i) ls.pb(h[l]);
For(l,0,i) h[i]=ls[i];
t=i;
break;
}
}
}
// for(int i=0;i<sz;i++)
// {
// int u=h[i],v=h[(i+1)%sz];
// if(!e[u][v]) puts("FLY");
// }
ok: ;
return;
For(i,0,sz-1)
{
int u=h[i],v=h[(i+1)%sz];
e[u][v]=0,e[v][u]=1;
cls();
Sum=0;
For(u,1,n) if(!dfn[u]) tarjan2(u);
ans[u][v]=Sum;
e[u][v]=1,e[v][u]=0;
}
}
int pw2[N*N];
int work()
{
n=read();
For(i,1,n) For(j,1,n) e[i][j]=0;
For(i,1,n) scc[i].clear();
For(i,1,n-1)
{
int up=(i+3)>>2;
For(j,1,up)
{
int t=turn(getc());
For(k,0,3)
{
bool tt=t>>k&1;
int t1=i+1,t2=4*j+k-3;
if(t2<t1)
{
if(tt) e[t1][t2]=1;
else e[t2][t1]=1;
}
}
}
}
// For(i,1,n)
// {
// For(j,1,n) putchar(e[i][j]+'0'); puts("");
// }
cls();
For(i,1,n) if(!dfn[i]) tarjan(i);
// cout<<ct2<<endl;
memset(rd,0,n+2<<2);
For(u,1,n)
{
For(v,1,n) if(e[u][v])
{
e2[bel[u]].pb(bel[v]);
rd[bel[v]]++;
}
}
int l=1,r=0;
For(i,1,ct2) if(!rd[i]) q[++r]=i;
while(l<=r)
{
int u=q[l++];
cid[u]=l-1;
for(auto v:e2[u])
{
rd[v]--;
if(!rd[v]) q[++r]=v;
}
}
For(i,1,n) For(j,1,n) ans[i][j]=ct2;
// For(i,1,r) cout<<bel[q[i]]<<" "; puts("");
For(i,1,n) For(j,1,n) if(e[i][j])
{
if(bel[i]==bel[j]) continue;
int u=bel[i],v=bel[j];
ans[i][j]=ct2-(cid[v]-cid[u]);
if(cid[v]-cid[u]==1) ans[i][j]++;
// cout<<i<<" "<<j<<" "<<ans[i][j]<<endl;
}
int tct2=ct2;
For(i,1,tct2) solve(scc[i]);
int Ans=0;
For(i,1,n)
{
For(j,1,i-1)
{
int t=(e[i][j]?ans[i][j]:ans[j][i]);
Ans=(Ans+pw2[(i-2)*(i-1)/2+j-1]*1ll*t)%P;
}
}
return Ans;
// For(i,1,n)
// {
// For(j,1,n) putchar(e[i][j]+'0');
// puts("");
// }
}
int main()
{
pw2[0]=1;
For(i,1,N*N-5) pw2[i]=(pw2[i-1]+pw2[i-1])%P;
int T=read();
while(T--) printf("%d\n",work());
return 0;
}
/*
*/
Details
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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%