Submission #1229948

#	Time	Username	Problem	Language	Result	Execution time	Memory
1229948		ansori	The Potion of Great Power (CEOI20_potion)	C++20	0 / 100	134 ms	327680 KiB

potion

#include<bits/stdc++.h>
using namespace std;
const int BL = 500 ,  NN = 2e5 + 2;
vector<int> a , b , h;
vector<int> g[NN / BL + 2][NN];
set<int> gg[NN];
int n , d;
void init(int N, int D, int H[]) {
	h = vector<int> (N , 0);
	n = N , d = D;
	for(int i = 0;i < n; ++ i) h[i] = H[i];
}

void curseChanges(int U, int A[], int B[]) {
	for(int i = 0;i < U; ++ i){
		if(A[i] > B[i]) swap(A[i] , B[i]);
		a.push_back(A[i]);
		b.push_back(B[i]);
		if(gg[a[i]].find(b[i]) == gg[a[i]].end()){
			gg[a[i]].insert(b[i]);
			gg[b[i]].insert(a[i]);
		}
		else{
			gg[a[i]].erase(b[i]);
			gg[b[i]].erase(a[i]);
		}
		if((i + 1) % BL == 0){
			for(int i = 0;i < n; ++ i){
				for(auto to : gg[i]){
					g[(i + 1) / BL][i].push_back(to);
				}
			}
		}
	}
}

int question(int x, int y, int v) {
	if(x > y) swap(x , y);
	v --;
	unordered_set<int> vx , vy;
	for(auto to : g[(v + 1) / BL][x]) vx.insert(to);
	for(auto to : g[(v + 1) / BL][x]) vy.insert(to);
	for(int i = (v + 1) / BL * BL;i <= v; ++ i){
		//cout << i << ' ';
		if(a[i] == x or b[i] == x){
			int f = a[i] + b[i] - x;
			if(! vx.count(f)) vx.insert(f);
			else vx.erase(f);
		}
		if(a[i] == y or b[i] == y){
			int f = a[i] + b[i] - y;
			if(! vy.count(f)) vy.insert(f);
			else vy.erase(f);
		}
	}
	vector<int> hx , hy;
	//cout << x << ' ' << y << ' ';
	for(auto to : vx){
		//cout << to << ' ';
		hx.push_back(h[to]);
	}
	for(auto to : vy){
		//cout << to << ' ';
		hy.push_back(h[to]);
	}
	if(hx.size() == 0 or hy.size() == 0) return 1000000000;
	sort(hx.begin() , hx.end());
	sort(hy.begin() , hy.end());
	int j = 0 , answ = 1e9;
	for(auto to : hx){
		while(j < hy.size() and hy[j] <= to) j ++;
		answ = min({answ , abs(to - hy[max(0 , j - 1)]) , abs(to - hy[min(n - 1 , j)])});
	}
    return answ;
}

• Subtask 1: 0 / 0
• Subtask 2: 0 / 17
• Subtask 3: 0 / 14
• Subtask 4: 0 / 18
• Subtask 5: 0 / 21
• Subtask 6: 0 / 30