Submission #946191

#	Time	Username	Problem	Language	Result	Execution time	Memory
946191		stdfloat	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	348 KiB

skyscraper

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

using ll = long long;

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n, m;
	cin >> n >> m;

	vector<int> X(m), P(m);
	for (int i = 0; i < m; i++)
		cin >> X[i] >> P[i];

	int mn = INT_MAX;
	vector<int> dis(n, INT_MAX); dis[X[0]] = 0;
	priority_queue<pair<int, pair<int, int>>> q; q.push({0, {X[0], P[0]}});
	while (!q.empty()) {
		int d = q.top().first;
		auto [x, p] = q.top().second; q.pop();
	
		for (int i = x; i >= 0; i -= p) {
			for (int j = 0; j < m; j++) {
				if (!(abs(X[j] - i) % P[j]) && dis[x] + (x - i) / p + abs(X[j] - i) / P[j] < dis[i]) {
					dis[i] = dis[x] + (x - i) / p + abs(X[j] - i) / P[j];
					q.push({-dis[i], {i, P[j]}});
					
					if (j == 1) mn = min(mn, dis[i]);
				}
			}
		}
		for (int i = x; i < n; i += p) {
			for (int j = 0; j < m; j++) {
				if (!(abs(X[j] - i) % P[j]) && dis[x] + (i - x) / p + abs(X[j] - i) / P[j] < dis[i]) {
					dis[i] = dis[x] + (i - x) / p + abs(X[j] - i) / P[j];
					q.push({-dis[i], {i, P[j]}});
					
					if (j == 1) mn = min(mn, dis[i]);
				}
			}
		}
	}

	cout << (mn == INT_MAX ? -1 : mn);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:20:7: warning: unused variable 'd' [-Wunused-variable]
   20 |   int d = q.top().first;
      |       ^

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