Submission #250024

#	Time	Username	Problem	Language	Result	Execution time	Memory
250024		Evirir	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	349 ms	8436 KiB

skyscraper

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;

#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=(a);i<(b);i++)
#define fore(i,a,b) for(int i=(a);i<=(b);i++)
#define pb push_back
#define F first
#define S second
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef pair<ll,ii> iii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef long double ld;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
void amin(ll &a, ll b){ a=min(a,b); }
void amax(ll &a, ll b){ a=max(a,b); }
void YES(){cout<<"YES\n";} void NO(){cout<<"NO\n";}
void SD(int t=0){ cout<<"PASSED "<<t<<endl; }
const ll INF = ll(1e18);
const int MOD = 998244353;

const bool DEBUG = 0;
const int MAXN = 30005;
const int MAXP = 30005;
const int MAXM = 30005;
const int LIM = 2;

int n,m;
int a[MAXM],p[MAXM];
vi v[MAXN];
ll dist[MAXN][LIM];

priority_queue<iii,vector<iii>,greater<iii>> q;
void add(ll x, ll y, ll w, ll d)
{
	if(x<0 || x>=n) return;
	
	if(y>=LIM)
	{
		for(int i=x%y;i<n;i+=y){
			add(i, 0, abs(x-i)/y, d);
		}
	}
	else
	{
		if(dist[x][y]>d+w){
			dist[x][y]=d+w;
			q.push({dist[x][y],{x,y}});
		}
	}
}

void dijkstra(ii src)
{
	dist[src.F][src.S]=0;
	q.push({0,src});
	
	while(!q.empty())
	{
		ii u=q.top().S; q.pop();
		if(u.S)
		{
			add(u.F-u.S, u.S, 1, dist[u.F][u.S]);
			add(u.F+u.S, u.S, 1, dist[u.F][u.S]);
			add(u.F, 0, 0, dist[u.F][u.S]);
		}
		else
		{
			for(int P: v[u.F])
			{
				add(u.F, P, 0, dist[u.F][u.S]);
			}
		}
	}
}

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	
	cin>>n>>m;
	forn(i,0,m){
		cin>>a[i]>>p[i];
		v[a[i]].pb(p[i]);
	}
	
	forn(i,0,n) forn(j,0,LIM) dist[i][j]=INF;
	dijkstra({a[0],0});
	
	if(dist[a[1]][0]<INF) cout<<dist[a[1]][0]<<'\n';
	else cout<<-1<<'\n';
	
	return 0;
}

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