oj.uz

답안 #442739

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
442739 2021-07-08T19:59:04 Z leaked 관광지 (IZhO14_shymbulak) C++14
80 / 100
 184 ms 27184 KB 
#include <bits/stdc++.h>
//#pragma GCC optimize("unroll-loops")
//#pragma GCC optimize("Ofast")
//#pragma GCC optimize("-O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define vec vector
#define sz(x) ( int)x.size()
#define m_p make_pair
#define f first
#define s second
#define pb push_back
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define int long long
using namespace std;
typedef long long ll;
typedef pair<ll, int> pli;
typedef pair<int,ll> pil;
typedef pair<int,int> pii;
typedef unsigned long long ull;
auto rng=bind(uniform_int_distribution<int>(1,1000),mt19937(time(0)));
template<class T> bool umax(T &a,const T &b){return (a<b?a=b,1:0);}
template<class T> bool umin(T &a,const T &b){return (a>b?a=b,1:0);}
const int N=2e5+1;
vec<int> g[N];
int n;
int dst[N];
int used[N],pr[N];
vec<int>cyc;
//vec<int>g
void dfs(int v,int p){
    used[v]=1;
    for(auto &z : g[v]){
        if(z==p) continue;
        if(used[z]==1){
            int u=v;
            while(u!=z){
                cyc.pb(u);
                u=pr[u];
            }
            cyc.pb(u);
        }
        else if(!used[z]){
             pr[z]=v;
             dfs(z,v);
        }
    }
    used[v]=2;
}
pii ans=m_p(0,0);
pii dp[N];
void upd(pii &a,pii b){
    if(a.f<b.f) a=b;
    else if(a.f==b.f) a.s+=b.s;
}
void dfs2(int v,int p){
    vec<int>vc;
    dp[v]={0,1};
    for(auto &z : g[v]){
        if(used[z] || z==p) continue;
        dfs2(z,v);
        upd(dp[v],{dp[z].f+1,dp[z].s});
        vc.pb(z);
    }
    int m=sz(vc);
    vec<pii>pref(m),suf(m);
    pii me={0,0};
    for(int i=0;i<m;i++){
        int z=vc[i];
        pref[i]=me;
        upd(me,{dp[z].f+1,dp[z].s});
    }
    for(int i=0;i<m;i++){
        pii x=pref[i];
        if(x.f==0) x.s=1;
        upd(ans,m_p(dp[vc[i]].f+1+x.f,1ll*x.s*dp[vc[i]].s));
    }
}
struct myset{
    map<int,int>mp;
    int ad=0;
    void add(pii x){
        x.f-=ad;
        mp[x.f]+=x.s;
    }
    void del(pii x){
        x.f-=ad;
        assert(mp[x.f]>=x.s);
        mp[x.f]-=x.s;
        if(!mp[x.f]) mp.erase(x.f);
    }
    pii get(){
        pii x={-1e9,-1};
        if(sz(mp)){
            x=*mp.rbegin();
        }
        x.f+=ad;
        return x;
    }
}f,s;
signed main(){
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    cin>>n;
    for(int i=0;i<n;i++){
        int v,u;
        cin>>v>>u;--v;--u;
        g[v].pb(u);g[u].pb(v);
    }
    dfs(0,0);
    fill(used,used+n,0);
    for(auto &z : cyc) used[z]=1;
    for(auto &z : cyc){
        dfs2(z,z);
    }
    assert(sz(cyc));
//    cerr<<ans.f<<' '<<ans.s<<endl;
    int l=sz(cyc)/2;
//    cout<<l<<endl;
    for(int i=0;i<sz(cyc);i++){
        int v=cyc[i];
        if(i>l){
            s.add({dp[v].f+sz(cyc)-i,dp[v].s});
        }
        else{
            f.add({dp[v].f+i,dp[v].s});
        }
    }
    auto dst=[&](int i,int j){
        int x=(i-j+sz(cyc))%sz(cyc);
        return min(x,sz(cyc)-x);
    };
    for(int i=0;i<sz(cyc);i++){
        int v=cyc[i];
        f.del(dp[v]);
//        cerr<<<<' '<<dp[i].f<<' '<<f.get().f<<' '<<s.get().f<<endl;
        pii me=f.get();
        upd(ans,{me.f+dp[v].f,1ll*me.s*dp[v].s});
        if(sz(cyc)%2==0){
            int u=cyc[(i+l)%2];
            pii x={dp[u].f+dp[v].f,1ll*dp[u].s*dp[u].s};
            upd(ans,x);
        }
        int j=(i+l+1)%sz(cyc);
        int u=cyc[j];
        s.del({dp[u].f+dst(i,j),dp[u].s});
        s.add(dp[v]);
        s.ad++;
        f.ad--;
        f.add({dp[u].f+dst((i+1)%sz(cyc),j),dp[u].s});
    }
//    cout<<ans.f<<' '<<ans.s<<endl;
    cout<<ans.s;
    return 0;
}

/*
5
1 2
2 3
3 4
4 5
5 1
*/

Subtask #1
30.0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 4940 KB Output is correct
2 Correct 3 ms 4940 KB Output is correct
3 Correct 3 ms 4940 KB Output is correct
4 Correct 3 ms 4940 KB Output is correct
5 Correct 3 ms 4940 KB Output is correct
6 Correct 3 ms 4940 KB Output is correct
7 Correct 3 ms 4940 KB Output is correct
8 Correct 3 ms 4940 KB Output is correct
9 Correct 3 ms 4940 KB Output is correct
10 Correct 3 ms 4940 KB Output is correct
11 Correct 3 ms 4940 KB Output is correct
12 Correct 3 ms 4940 KB Output is correct
13 Correct 3 ms 4940 KB Output is correct
14 Correct 3 ms 5068 KB Output is correct
15 Correct 4 ms 5096 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 5196 KB Output is correct
2 Correct 3 ms 5068 KB Output is correct
3 Correct 4 ms 5068 KB Output is correct
4 Incorrect 4 ms 5068 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
50.0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 66 ms 11972 KB Output is correct
2 Correct 78 ms 12168 KB Output is correct
3 Correct 75 ms 19048 KB Output is correct
4 Correct 52 ms 11844 KB Output is correct
5 Correct 50 ms 11796 KB Output is correct
6 Correct 184 ms 18420 KB Output is correct
7 Correct 116 ms 15044 KB Output is correct
8 Correct 106 ms 18632 KB Output is correct
9 Correct 108 ms 18760 KB Output is correct
10 Correct 96 ms 19880 KB Output is correct
11 Correct 99 ms 25984 KB Output is correct
12 Correct 114 ms 27184 KB Output is correct