Submission #410194

#	Time	Username	Problem	Language	Result	Execution time	Memory
410194		jeqcho	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	57 / 100	405 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 N=3e4+3;
int const sN=174;
int const M=3e4+3;
int b[M];
int p[M];
int d[N][sN];
int const INF=1e9;
vector<pair<pii,int>>adj[N][sN];
bitset<sN> vis[N];

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];
		if(p[i]>=sN)
		{
			int nxt=b[i]+p[i];
			int cnt=1;
			while(nxt<n)
			{
				adj[b[i]][0].pb({{nxt,0},cnt});
				++cnt;
				nxt+=p[i];
			}
			nxt=b[i]-p[i];
			cnt=1;
			while(nxt>=0)
			{
				adj[b[i]][0].pb({{nxt,0},cnt});
				++cnt;
				nxt-=p[i];
			}
		}
		else
		{
			adj[b[i]][0].pb({{b[i],p[i]},0});
		}
	}
	F0R(i,n)
	{
		F0R(j,sN)
		{
			if(i+j>=n)break;
			adj[i][j].pb({{i+j,j},1});
			adj[i][j].pb({{i+j,0},1});
		}
		F0R(j,sN)
		{
			if(i-j<0)break;
			adj[i][j].pb({{i-j,j},1});
			adj[i][j].pb({{i-j,0},1});
		}
	}
	F0R(i,n)
	{
		fill(d[i],d[i]+sN,INF);
	}
	priority_queue<pair<int,pii>> q;
	d[b[0]][0]=0;
	q.push({0,{b[0],0}});
	while(!q.empty())
	{
		int pos = q.top().se.fi;
		int pw = q.top().se.se;
		q.pop();
		if(vis[pos][pw])continue;
		vis[pos][pw]=1;
		trav(e,adj[pos][pw])
		{
			int cand = d[pos][pw]+e.se;
			if(cand<d[e.fi.fi][e.fi.se])
			{
				d[e.fi.fi][e.fi.se]=cand;
				q.push({-cand,e.fi});
			}
		}
		adj[pos][pw].clear();
	}
	if(d[b[1]][0]==INF)cout<<-1<<'\n';
	else cout<<d[b[1]][0]<<'\n';
	return 0;
}

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