Submission #412616

#	Time	Username	Problem	Language	Result	Execution time	Memory
412616		jeqcho	Tropical Garden (IOI11_garden)	C++17	0 / 100	7 ms	10956 KiB

garden

#include "garden.h"
#include "gardenlib.h"


#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=15e4+3;
vpi adj[n];
int nxt[n][2];
vpi pre[n][2];
int d[n][2];
int P;

void dfs(int now,bool f,int w)
{
	if(d[now][f]>0)return;
	d[now][f]=w;
	trav(e,pre[now][f])
	{
		dfs(e.fi,!e.se,w+1);
	}
}

void count_routes(int N, int M, int p, int R[][2], int Q, int G[]){
	P=p;
	F0R(i,M)
	{
		int u = R[i][0];
		int v = R[i][1];
		adj[u].pb({M-i,v});
		adj[v].pb({M-i,u});
	}
	F0R(i,N)
	{
		sort(all(adj[i]));
		reverse(all(adj[i]));
		nxt[i][0]=adj[i][0].se;
		nxt[i][1]=adj[i][0].se;
		if(sz(adj[i])>1)
		{
			nxt[i][1]=adj[i][1].se;
		}
	}
	F0R(i,N)
	{
		if(nxt[nxt[i][0]][0]==i)
		{
			pre[nxt[i][0]][1].pb({i,0});
		}
		else
		{
			pre[nxt[i][0]][0].pb({i,0});
		}
		if(nxt[nxt[i][1]][0]==i)
		{
			pre[nxt[i][1]][1].pb({i,1});
		}
		else
		{
			pre[nxt[i][1]][0].pb({i,1});
		}
	}
	F0R(i,N)
	{
		d[i][0]=d[i][1]=-1;
	}
	dfs(P,0,0);
	dfs(P,1,0);
	F0R(j,Q)
	{
		int ans=0;
		F0R(i,N)
		{
			if(d[i][0]!=-1 && (G[j]%d[i][0]==0||G[j]%d[i][1]==0))
			{
				++ans;
			}
		}
		answer(ans);
	}
}

• Subtask 1: 0 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31