Submission #1038263

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038263		_8_8_	Game (APIO22_game)	C++17	30 / 100	881 ms	262144 KiB

game

#include "game.h"

#include <bits/stdc++.h>
using namespace std;
 
const int N = 3e5 + 12;
vector<int> g[N],gr[N];
set<int> L[N * 3],R[N * 3];
int k;
int vall[N],valr[N];
void build(int v = 1,int tl = 0,int tr = k - 1) {
    int tm = (tl + tr) >> 1;
    for(int i = tl;i <= tr;i++) {
        valr[i] = max(valr[i],tm);
        vall[i] = min(vall[i],tm);
        if(i <= tm) {
            L[v].insert(i);
        }
        if(i >= tm) {
            R[v].insert(i);
        }
    }
    if(tl == tr) return;
    build(v + v,tl,tm);
    build(v + v + 1,tm + 1,tr);
}
void init(int n, int K) {
    k = K;
    for(int i = 0;i < n;++i) {
        vall[i] = 1e9;
    }
    for(int i = 0;i <= k - 2;i++) {
        g[i].push_back(i + 1);
        gr[i + 1].push_back(i);
    }
    build();
}
bool CYC = false;
bool check = false;
void add(int x,int y,int v = 1,int tl = 0,int tr = k - 1) {
    if(CYC) return;
    int tm = (tl + tr) >> 1;
    bool ok = false,ok1 = false;
    function<void(int)> dfs = [&](int u){
        R[v].insert(u);
        valr[u] = max(valr[u],tm);
        ok = 1;
        if(L[v].find(u) != L[v].end()) {
            CYC = 1;
            return;
        }
        for(int to:g[u]) {
            if(valr[to] > tm) continue;
            if(R[v].find(to) == R[v].end()) {
                dfs(to);
            }
            if(CYC) return;
        }
        if(CYC) return;
    };
    if(R[v].find(x) != R[v].end()) {
        if(L[v].find(y) != L[v].end()) {
            CYC = 1;
            return;
        }
        if(R[v].find(y) == R[v].end() && valr[y] <= tm) dfs(y);
        if(tl != tr) add(x,y,v + v + 1,tm + 1,tr);
    } else {
        if(tl != tr) add(x,y,v + v,tl,tm);
    }
}
void addl(int x,int y,int v = 1,int tl = 0,int tr = k - 1) {
    if(CYC) return;
    int tm = (tl + tr) >> 1;
    function<void(int)> dfs1 = [&](int u){
        if(R[v].find(u) != R[v].end()) {
            CYC = 1;
            return;
        }
        L[v].insert(u);
        vall[u] = min(vall[u],tm);
        // if(!check) cout << tm << ' ' << u << "x\n";
        for(int to:gr[u]) {
            if(vall[to] < tm) continue;
            if(L[v].find(to) == L[v].end()) {
                dfs1(to);
            }
            if(CYC) return;
        }
        if(CYC) return;
    };
    if(L[v].find(y) != L[v].end()) {
        if(R[v].find(x) != R[v].end()) {
            CYC = 1;
            return;
        }
        if(L[v].find(x) == L[v].end() && vall[x] >= tm) dfs1(x);
        if(tl != tr) addl(x,y,v + v,tl,tm);
    } else {
        if(tl != tr) addl(x,y,v+v+1,tm+1,tr);
    }
}
int add_teleporter(int u, int v) {
    // if(max(u,v) <= k - 1) {
    //     if(u >= v) {
    //         CYC = 1;
    //         return 1;
    //     }
    //     return 0;
    // }
    if(!check) {
        addl(13,14);  
        add(k-2,k-1);
        check = 1;
    }
    if(CYC) return 1;
    g[u].push_back(v);
    gr[v].push_back(u);
    add(u,v);
    addl(u,v);
    return CYC;
}  

Compilation message (stderr)

game.cpp: In function 'void add(int, int, int, int, int)':
game.cpp:43:21: warning: unused variable 'ok1' [-Wunused-variable]
   43 |     bool ok = false,ok1 = false;
      |                     ^~~

• Subtask 1: 2 / 2
• Subtask 2: 10 / 10
• Subtask 3: 18 / 18
• Subtask 4: 0 / 30
• Subtask 5: 0 / 40