Submission #555976

#	Time	Username	Problem	Language	Result	Execution time	Memory
555976		MurotY	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	57 / 100	1096 ms	135276 KiB

skyscraper

// author : Murot_06
#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
#define ios ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define ff first
#define ll long long
#define ss second
using namespace std;
const int N=1e6+7, M=1e9+7;
ll a[N];
vector <pair <ll,ll>> g[N];
set <ll> v[N];
void solve()
{
	int n, m;
	cin >> n >> m;
	for (int i=1;i<=m;i++){
		ll x, y;
		cin >> x >> y;
		a[i]=x;
		v[x].insert(y);
	}
	for (int i=0;i<n;i++){
		for (auto l:v[i]){
			for (int j=i+l;j<n;j+=l){
				g[i].push_back({j, (j-i)/l});
			//	if (v[j].count(l)) break;
			}
			for (int j=i-l;j>=0;j-=l){
				g[i].push_back({j, (i-j)/l});
			//	if (v[j].count(l)) break;
			}
		}
	}
//	priority_queue<int, vector<int>, greater<int> >
	priority_queue <ll, vector <ll> , greater <ll>> q;
	vector <ll> d(n+10, 1e18);
	
	
	d[a[1]]=0;
	q.push(a[1]);
	while (!q.empty()){
		ll x=q.top();
		q.pop();
		for (auto l:g[x]){
			if (d[l.ff] > d[x]+l.ss){
				d[l.ff]=d[x]+l.ss;
				q.push(l.ff);
			}
		}
	}
	ll ans=d[a[2]];
	if (ans == 1e18) ans=-1;
	cout << ans;
	return ;
}
int main()
{
	ios;
	int t=1;
//	cin >> t;
	while (t--){
	     solve();
	}
	return 0;
}

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