Submission #417793

#	Time	Username	Problem	Language	Result	Execution time	Memory
417793		DEQK	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	1095 ms	3140 KiB

skyscraper

#include <bits/stdc++.h>

#define ll long long
using namespace std;
const int N = 3e4 + 10;
vector<vector<int>> g(N);
int main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int n, m; cin >> n >> m;
	int f, s;
	for(short i = 0; i < m; i++) {
		int x, y; cin >> x >> y;
		if(i == 0) f = x;
		if(i == 1) s = x;
		if(y == 0) continue;
		g[x].push_back(y);
	}
	priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> c;
	vector<int> d(n, 2e9);
	d[f] = 0;
	c.push({0, f});
	while(!c.empty()) {
		int u = c.top().second, w = c.top().first;
		c.pop();
		if(d[u] != w) continue;
		if(u == s) {
			cout << d[s];
			return 0;
		}
		for(int x : g[u]) {
			for(int j = u % x; j < n; j += x) {
				if(d[j] > d[u] + abs(j - u) / x) {
					d[j] = d[u] + abs(j - u) / x;
					c.push({d[j], j});
				} 
			}
		}
	}
	cout << -1;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:20:5: warning: 'f' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |  d[f] = 0;
      |     ^
skyscraper.cpp:26:3: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 |   if(u == s) {
      |   ^~

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