Submission #299442

#	Time	Username	Problem	Language	Result	Execution time	Memory
299442		FlashGamezzz	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1062 ms	5368 KiB

skyscraper

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <fstream>
#include <algorithm>
#include <string>
#include <utility>
#include <vector>
#include <unordered_set>
#include <unordered_map>

using namespace std;

bool done[30000] = {};
int n, m, d0, d1, ans = -1;
unordered_set<int> doges[30000];
unordered_map<int, int> dists;


int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> n >> m;
	for (int i = 0; i < m; i++){
		int a, b; cin >> a >> b;
		if (i == 0) d0 = a;
		if (i == 1) d1 = a;
		doges[a].insert(b);
	}
	for (int i = 0; i < n; i++){
		dists.insert(make_pair(i, 30001));
	}
	dists[d0] = 0;
	while (true){
		int i = -1, md = 30001;
		for (unordered_map<int, int>::iterator it = dists.begin(); it != dists.end(); it++){
			if (it->second < md){
				md = it->second; i = it->first;
			}
		}
		if (i == -1){
			break;
		}
		if (i == d1){
			ans = dists[i];
			break;
		}
		for (int p : doges[i]){
			for (long ni = i % p; ni < n; ni+=p){
				if (!done[ni] && dists[ni] > dists[i] + abs((i-ni)/p)){
					dists[ni] = dists[i] + abs((i-ni)/p);
				}
			}
		}
		dists.erase(i);
		done[i] = true;
	}
	cout << ans << endl;
}

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