Submission #794743

#	Time	Username	Problem	Language	Result	Execution time	Memory
794743		bane	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1096 ms	5704 KiB

skyscraper

#include<bits/stdc++.h>
using namespace std;

#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")

void solve(){
	int n, m;
	cin >> n >> m;
	vector<pair<int,int>>monsters(m);
	vector<set<int>>pos(n);
	for (int i = 0; i < m; i++){
		int b, p;
		cin >> b >> p;
		pos[b].insert(p);
		monsters[i] = {b,p};
	}
	vector<long long>dp(n, (long long)1e18);
	dp[monsters[0].first] = 0;
	priority_queue<pair<long long,int>>pq;
	pq.push({0,monsters[0].first});
	while(!pq.empty()){
		long long dst = -pq.top().first;
		int b = pq.top().second;
		pq.pop();
		//node + pow * x = mn
		if (dp[b] != dst)continue;
		if (b == monsters[1].first){
			cout << dst << endl;
			return ;
		}
		if (pos[b].empty())continue;
		int pmin = *pos[b].begin();
		for (int i = 1; i <= n / pmin; i++){
			for (auto p : pos[b]){
				bool ok = 0;
				int right = b + i * p;
				int left = b - i * p;
				if (left >= 0){
					ok = 1;
					if (dp[left] > dst + i){
						dp[left] = dst + i;
						pq.push({-dst-i,left});
					}
				}  

				if (right <= n - 1){
					ok = 1;
					if (dp[right] > dst + i){
						dp[right] = dst + i;
						pq.push({-dst-i,right});
					}
				}
				if (!ok)break;
			}
		}
	}
	cout << - 1 << endl;
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	solve();
	return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 0 / 43