Submission #1147225

#	Time	Username	Problem	Language	Result	Execution time	Memory
1147225		Dan4Life	The Potion of Great Power (CEOI20_potion)	C++20	0 / 100	726 ms	303464 KiB

potion

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) begin(a),end(a)
using ar2 = array<int,2>;
const int mxN = (int)1e5+10;
const int B = 1000;
const int totB = (int)5e4/B+2;
int n, m;
int a[mxN];
vector<ar2> v;
unordered_map<int,set<ar2>> S[totB];

void init(int N, int D, int H[]) {
	n = N;
	for(int i = 0; i < n; i++) a[i]=H[i];
}

void toggle(int x, int y, int t){
	if(S[t][x].count({a[y],y})) S[t][x].erase({a[y],y});
	else S[t][x].insert({a[y],y});
}

void curseChanges(int U, int A[], int _B[]) {
	m = U;
	for(int i = 0; i < m; i++){
		int x = A[i], y = _B[i]; v.pb({x,y});
		for(int j = i/B+1; j < totB; j++)
			toggle(x,y,j), toggle(y,x,j);
	}
}

int question(int x, int y, int t) {
	int ans = (int)1e9; if(!t) return ans;
	int origT = t; t/=B;
	for(int i = t*B; i <= origT; i++) 
		toggle(v[i][0],v[i][1],t),toggle(v[i][1],v[i][0],t); 
	if(!sz(S[t][x]) or !sz(S[t][y])){
		for(int i = t*B; i <= origT; i++) 
			toggle(v[i][0],v[i][1],t),toggle(v[i][1],v[i][0],t); 
		return ans;
	}
	auto itr = begin(S[t][y]);
	for(auto [u,v] : S[t][x]){
		while(itr!=end(S[t][y]) and (*itr)[0] < u) itr++;
		if(itr!=begin(S[t][y])) ans=min(ans, abs(u-(*prev(itr))[0]));
		if(itr!=end(S[t][y])) ans=min(ans, abs(u-(*itr)[0]));
	}
	for(int i = t*B; i <= origT; i++) 
		toggle(v[i][0],v[i][1],t),toggle(v[i][1],v[i][0],t); 
    return ans;
}

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