Submission #602287

#	Time	Username	Problem	Language	Result	Execution time	Memory
602287		patrikpavic2	Game (APIO22_game)	C++17	30 / 100	4094 ms	28088 KiB

game

#include "game.h"
#include <vector>
#include <cstdio>
#define PB push_back
 
using namespace std;
 
const int N = 5e5 + 500;
const int BUK = 400;
 
int n, k, ans;
vector < int > v[N], r[N];
int L[N], R[N], bukL[N], bukR[N], rac[N], bio[N], cookie;
 
void init(int _n, int _k) {
	n = _n, k = _k;
	for(int i = 0;i < n;i++)
		L[i] = -1, R[i] = n, bukL[i] = -1, bukR[i] = k;
	for(int i = 0;i < k;i++)
		L[i] = i, R[i] = i, bukL[i] = i / BUK, bukR[i] = i / BUK, rac[i] = 1;
}
 
void buk_noviL(int x, int vr){
	bukL[x] = vr;
	for(int y : v[x]) 
		if(bukL[y] < vr) buk_noviL(y, vr);
}
 
void buk_noviR(int x, int vr){
	bukR[x] = vr;
	for(int y : r[x])
		if(bukR[y] > vr) buk_noviR(y, vr);
}
 
void noviL(int x, int vr){
	L[x] = vr;
	for(int y : v[x]) 
		if(L[y] < vr && bukR[y] <= vr / BUK) noviL(y, vr);
}
 
void stariL(int x){
	if(bio[x] == cookie) return;
	bio[x] = cookie;
	for(int y : r[x]){
		if(bukL[y] < bukL[x]) continue;
		stariL(y); L[x] = max(L[x], L[y]);
	}
}
 
void stariR(int x){
	if(bio[x] == cookie) return;
	bio[x] = cookie;
	for(int y : v[x]){
		if(bukR[y] > bukR[x]) continue;
		stariR(y); R[x] = min(R[x], R[y]);
	}
}
 
void noviR(int x, int vr){
	R[x] = vr;
	for(int y : r[x])
		if(R[y] > vr && bukL[y] >= vr / BUK) noviR(y, vr);
}
 
void update(int a){
	if(bukL[a] == bukR[a] && !rac[a]){
		cookie++; stariL(a); 
		cookie++; stariR(a); 
		//rac[a] = 1;
	}
}
 
int add_teleporter(int a, int b) {
	v[a].PB(b), r[b].PB(a);
	if(a == b && a < k) ans = 1;
	if(bukL[b] < bukL[a]) buk_noviL(b, bukL[a]);
	if(bukR[a] > bukR[b]) buk_noviR(a, bukR[b]);
		
	ans |= bukL[a] > bukR[a];
	ans |= bukL[b] > bukR[b];
	if(L[b] < L[a] && bukR[b] <= L[a] / BUK) noviL(b, L[a]);
	if(R[a] > R[b] && bukL[a] >= R[b] / BUK) noviR(a, R[b]);
	update(a); update(b);
	if(a >= k) ans |= L[a] == R[a];
	if(b >= k) ans |= L[b] == R[b];
	ans |= L[a] > R[a];
	ans |= L[b] > R[b];
	
	
	return ans;
}

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