Submission #699854

#	Time	Username	Problem	Language	Result	Execution time	Memory
699854		happypotato	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1098 ms	86820 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
const int mxN = 3e4 + 1;
pair<int, int> doge[mxN];
queue<int> jump[mxN];
map<int, int> dist[mxN];
priority_queue<pair<int, pair<int, int>>, vector<pair<int, pair<int, int>>>, greater<pair<int, pair<int, int>>>> pq;
int n;
void AddElement(pair<int, pair<int, int>> &nxt) {
	if (!(0 <= nxt.second.first && nxt.second.first < n)) return;
	if (dist[nxt.second.first].find(nxt.second.second) == dist[nxt.second.first].end()) {
		pq.push(nxt);
		dist[nxt.second.first][nxt.second.second] = nxt.first;
	} else if (dist[nxt.second.first][nxt.second.second] > nxt.first) {
		pq.push(nxt);
		dist[nxt.second.first][nxt.second.second] = nxt.first;
	}
}
void solve() {
	int m;
	cin >> n >> m;
	for (int i = 0; i < m; i++) {
		cin >> doge[i].first >> doge[i].second;
		if (i != 0) jump[doge[i].first].push(doge[i].second);
	}
	pq.push({0, doge[0]});
	dist[doge[0].first][doge[0].second] = 0;
	while (!pq.empty()) {
		pair<int, pair<int, int>> cur = pq.top();
		pq.pop();
		if (dist[cur.second.first][cur.second.second] < cur.first) continue;
		if (cur.second.first == doge[1].first) {
			cout << cur.first << endl;
			return;
		}
		pair<int, pair<int, int>> nxt;
		while (!jump[cur.second.first].empty()) {
			int delta = jump[cur.second.first].front();
			jump[cur.second.first].pop();
			nxt = {cur.first, {cur.second.first, delta}};
			AddElement(nxt);
		}
		nxt = {cur.first + 1, {cur.second.first - cur.second.second, cur.second.second}};
		AddElement(nxt);
		nxt = {cur.first + 1, {cur.second.first + cur.second.second, cur.second.second}};
		AddElement(nxt);
	}
	cout << "-1\n";
}
int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	solve();
}

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