Submission #299817

#	Time	Username	Problem	Language	Result	Execution time	Memory
299817		FlashGamezzz	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	950 ms	2968 KiB

skyscraper

#include <iostream>
#include <cstdlib>
#include <cstdio>
#include <fstream>
#include <algorithm>
#include <string>
#include <utility>
#include <vector>
#include <queue>
#include <cassert>
 
using namespace std;
 
bool done[30000] = {};
int n, m, d0, d1, dists[30000] = {}, ans = -1;
vector<int> doges[30000];
priority_queue<pair<int, int> > pq;
 
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].push_back(b);
	}
	for (int i = 0; i < n; i++){
		dists[i] = 30001;
	}
	pq.push(make_pair(0, d0));
	dists[d0] = 0;
	while (pq.size() > 0){
		int i = pq.top().second; pq.pop();
		if (done[i]){
			continue;
		}
		if (i == d1){
			ans = dists[i];
			break;
		}
		for (int p : doges[i]){
            for (int j=i+p, add = 1; j<n; j+= p, add++) {
              	assert(j >= 0);
              	if (dists[i]+add < dists[j]) {
                	dists[j] = dists[i]+add;
                	pq.push(make_pair(-dists[j], j));
                }
            }
            for (int j=i-p, add = 1; j>= 0; j-= p, add++) {
            	if (dists[i]+add < dists[j]) {
                	dists[j] = dists[i]+add;
                	pq.push(make_pair(-dists[j], j));
                }
            }
		}
		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