Submission #410139

#	Time	Username	Problem	Language	Result	Execution time	Memory
410139		jeqcho	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	10 / 100	2 ms	2004 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;
bitset<N> vis;
int d[N];
int const INF=1e9;
unordered_set<int> doges[N];
unordered_set<int> visited;
int far[M];

// subtask 1,2,3,4

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];
		doges[b[i]].insert(i);
	}
	fill(d,d+n,INF);
	d[b[0]]=0;
	fill(far,far+n,0);
	visited.insert(b[0]);
	while(!visited.empty())
	{
		vi dead;
		vi nw;
		trav(place,visited)
		{
			++far[place];
			vi rem;
			trav(doge,doges[place])
			{
				int nxt = place + p[doge]*far[place];
				bool ok=0;
				if(nxt<n)
				{
					ok=1;
					if(!vis[nxt])
					{
						vis[nxt]=1;
						nw.pb(nxt);
						d[nxt]=d[place]+far[place];
					}
				}
				nxt = place - p[doge]*far[place];
				if(nxt>=0)
				{
					ok=1;
					if(!vis[nxt])
					{
						vis[nxt]=1;
						nw.pb(nxt);
						d[nxt]=d[place]+far[place];
					}
				}
				if(!ok)
				{
					rem.pb(doge);
				}
			}
			trav(doge,rem)
			{
				doges[place].erase(doge);
			}
			if(doges[place].empty())
			{
				dead.pb(place);
			}
		}
		trav(k,dead)
		{
			visited.erase(k);
		}
		trav(k,nw)
		{
			visited.insert(k);
		}
	}
	if(d[b[1]]==INF)cout<<-1<<'\n';
	else cout<<d[b[1]]<<'\n';
	return 0;
}

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