Submission #543348

#	Time	Username	Problem	Language	Result	Execution time	Memory
543348		PixelCat	Port Facility (JOI17_port_facility)	C++14	0 / 100	0 ms	212 KiB

port_facility

/* code by the cute ~~Dengdualang~~ PixelCat owo */
/*     as cute as nacho neko (aka. my wife)!     */

/*     Nhade stay for a night here               */
/*     183234 deng deng deng pixelcat oops       */
/*     (yang wang yesu)*2                        */
/*     ^ some weird stuff. nvm =w=               */

// #pragma GCC optimize("O4,unroll-loops,no-stack-protector")
// #pragma GCC target("avx,avx2,sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,fma")

#include <bits/stdc++.h>
#define int LL  //__int128
#define double long double
using namespace std;
using LL = long long;
using LLL = __int128_t;
using uLL = unsigned long long;
using pii = pair<int, int>;

#define For(i, a, b) for (int i = a; i <= b; i++)
#define Fors(i, a, b, s) for (int i = a; i <= b; i += s)
#define Forr(i, a, b) for (int i = a; i >= b; i--)
#define F first
#define S second
#define L(id) (id * 2 + 1)
#define R(id) (id * 2 + 2)
#define LO(x) (x & (-x))

#define eb emplace_back
#define all(x) x.begin(), x.end()
#define sz(x) ((int)x.size())
#define mkp make_pair

// #define MOD (int)(998244353)
#define MOD (int)((LL)1'000'000'007)
#define INF (int)(4e18)
// #define INF 1e9
#define EPS (1e-6)

#ifdef NYAOWO
#include "library/debug.hpp"
inline void USACO(const string &s) {
    cerr << "USACO: " << s << "\n";
}

#else
#define debug(...)
inline void timer() {}
inline void USACO(const string &s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

#endif

inline void NYA() {
    ios::sync_with_stdio(false);
    cin.tie(0);
}
inline int gcd(int a, int b) {
    return __gcd(a, b);
}
inline int lcm(int a, int b) {
    return a / gcd(a, b) * b;
}
int fpow(int b, int p, const int &mod) {
    int ans = 1;
    while (p) {
        if (p & 1) ans = ans * b % mod;
        p >>= 1;
        b = b * b % mod;
    }
    return ans;
}
int fpow(int b, int p) {
    return fpow(b, p, MOD);
}
template <typename T>
inline void chmin(T &_a, const T &_b) {
    if (_b < _a) _a = _b;
}
template <typename T>
inline void chmax(T &_a, const T &_b) {
    if (_b > _a) _a = _b;
}
// mt19937_64 rng(
//     chrono::steady_clock::now().time_since_epoch().count());

struct Node{
    Node *l,*r;
    int tag;
    vector<pair<Node*,int>> adj;
    Node():l(nullptr),r(nullptr),tag(0){}
    Node(const Node* nd){
        if(nd){
            l=nd->l; r=nd->r;
        }else{
            l=r=nullptr;
        }
        tag=0;
    }
};

Node* ptr[1000010];
Node* rt[1000010];

Node* update(Node *ori,int l,int r,int p,int x){
    Node* nd=new Node(ori);
    if(l==r){
        ptr[x]=nd;
        return nd;
    }
    int m=(l+r)/2;
    if(p<=m) nd->l=update(nd->l,l,m,p,x);
    else nd->r=update(nd->r,m+1,r,p,x);
    return nd;
}

void link(Node *seg,int l,int r,Node *nd,int L,int R){
    if(!seg) return;
    if(l>R || r<L) return;
    if(l>=L && r<=R){
        seg->adj.eb(nd,1);
        nd->adj.eb(seg,1);
        return;
    }
    int m=(l+r)/2;
    link(seg->l,l,m,nd,L,R);
    link(seg->r,m+1,r,nd,L,R);
}

void soft(Node *seg,bool owo){
    if(!seg || seg->tag==-1) return;
    seg->tag=-1;
    owo=owo || (sz(seg->adj)!=0);
    if(owo){
        if(seg->l){
            seg->adj.eb(seg->l,0);
            seg->l->adj.eb(seg,0);
        }
        if(seg->r){
            seg->adj.eb(seg->r,0);
            seg->r->adj.eb(seg,0);
        }
    }
    soft(seg->l,owo);
    soft(seg->r,owo);
}

bool dfs(Node* nd,int c){
    if(!nd) return true;
    if(nd->tag!=-1) return nd->tag==c;
    nd->tag=c;
    bool res=true;
    for(auto &i:nd->adj){
        res=res&&dfs(i.F,(i.S?1-c:c));
    }
    return res;
}

int32_t main() {
    NYA();
    // nyaacho >/////<
    // miku sama bless me >/////<
    int n; cin>>n;
    // assert(n<=2000);
    vector<pii> v(n);
    for(auto &i:v) cin>>i.F>>i.S;
    sort(all(v));
    rt[0]=nullptr;
    For(i,0,n-1){
        rt[i+1]=update(rt[i],1,n*2,v[i].S,i);
        link(rt[i+1],1,n*2,ptr[i],v[i].F+1,v[i].S-1);
    }
    Forr(i,n,1) soft(rt[i],false);
    int ans=1;
    For(i,0,n-1){
        if(ptr[i]->tag==-1){
            ans+=ans;
            if(ans>=MOD) ans-=MOD;
            if(!dfs(ptr[i],1)) ans=0;
        }
    }
    cout<<ans<<"\n";
    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 56
• Subtask 4: 0 / 22