Submission #678267

#	Time	Username	Problem	Language	Result	Execution time	Memory
678267		penguin133	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	22 / 100	13 ms	2260 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define pi pair<int, int>
#define pii pair<int, pi>
#define fi first
#define se second
#ifdef _WIN32
#define getchar_unlocked _getchar_nolock
#endif
 
int n, m;
int S[30005], P[30005];
int dist[30005];
vector<pi> pos[30005];
void solve(){
	cin >> n >> m;
	for(int i=0;i<m;i++)cin >> S[i] >> P[i], pos[S[i]].push_back({P[i], i});
	for(int i=0;i<n;i++)sort(pos[i].begin(), pos[i].end(), greater<>());
	for(int i=0;i<m;i++)dist[i] = 1e9;
	dist[1] = 0;
	priority_queue<pi, vector<pi>, greater<pi> > pq;
	pq.push({0, 1});
	unordered_set<int> s;
	for(int i=0;i<m;i++)s.insert(i);
	while(!pq.empty()){
		int x = pq.top().fi, y = pq.top().se;
		pq.pop();
		//cout << x << " " << y << '\n';
		if(dist[y] < x)continue;
		s.erase(y);
		for(auto i : s){
			if(abs(S[i] - S[y]) % P[i])continue;
			if(dist[i] > dist[y] + abs(S[i] - S[y]) / P[i])dist[i] = dist[y] + abs(S[i] - S[y]) / P[i], pq.push({dist[i], i});
		}
	}
	if(dist[0] == 1e9){
		cout << -1;
      return;
    }
  	assert(dist[0] <= n * 5);
    cout << dist[0];
}
 
main(){
	ios::sync_with_stdio(0);cin.tie(0);
	int tc = 1;
	//cin >> tc;
	for(int tc1=1;tc1<=tc;tc1++){
		// cout << "Case #" << tc1 << ": ";
		solve();
	}
}

Compilation message (stderr)

skyscraper.cpp:46:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   46 | main(){
      | ^~~~

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