Submission #410101

#	Time	Username	Problem	Language	Result	Execution time	Memory
410101		jeqcho	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	36 / 100	352 ms	262148 KiB

skyscraper

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

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vpi;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define fi first
#define se second

int const M=3e4+3;
int b[M],p[M];
int const N=3e4+3;
vpi adj[N];
bitset<N> vis;
int d[N];
int const INF=1e9;

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	int n,m;
	cin>>n>>m;
	F0R(i,m)
	{
		cin>>b[i]>>p[i];
	}
	F0R(i,m)
	{
		int u = b[i];
		int v=b[i]+p[i];
		int cnt=1;
		while(v<n)
		{
			adj[u].pb({v,cnt});
			++cnt;
			v+=p[i]; 
		}
		v=b[i]-p[i];
		cnt=1;
		while(v>=0)
		{
			adj[u].pb({v,cnt});
			++cnt;
			v-=p[i]; 
		}
	}
	priority_queue<pii> q;
	q.push({0,b[0]});
	fill(d,d+n,INF);
	d[b[0]]=0;
	while(!q.empty() && (!vis[b[1]]))
	{
		int u=q.top().se;
		q.pop();
		if(vis[u])continue;
		vis[u]=1;
		trav(e,adj[u])
		{
			int cand = d[u]+e.se;
			if(cand<d[e.fi])
			{
				d[e.fi]=cand;
				q.push({-cand,e.fi});
			}
		}
	}
	if(d[b[1]]==INF)cout<<-1<<'\n';
	else cout<<d[b[1]]<<'\n';
	return 0;
}

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