Submission #399007

#	Time	Username	Problem	Language	Result	Execution time	Memory
399007		Pichon5	Tropical Garden (IOI11_garden)	C++17	0 / 100	4 ms	5324 KiB

garden

#include <bits/stdc++.h>
#include "garden.h"
#include "gardenlib.h"
#define lcm(a,b) (a/__gcd(a,b))*b
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long int
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define F first
#define S second
#define mp make_pair
using namespace std;
const int tam=200000;
const int MA=29;
int up[tam][MA];
int up2[tam][MA];
int last[tam][MA];
int last2[tam][MA];
vector<pair<int,int> > G[tam];
void count_routes(int N, int M, int P, int R[][2], int Q, int g[])
{
    int n=N;
    for(int i=0;i<M;i++){
        int a=R[i][0],b=R[i][1];
        G[a].pb({b,i});
        G[b].pb({a,i});
    }
    for(int i=0;i<n;i++){
        if(G[i].size()<2)G[i].pb(G[i][0]);
        up[i][0]=G[i][0].F;
        last[i][0]=G[i][0].S;
        up2[i][0]=G[i][1].F;
        last2[i][0]=G[i][1].S;

    }
    for(int i=0;i<=29;i++){
        for(int nodo=0;nodo<n;nodo++){
            int u=up[nodo][i];
            up[nodo][i+1]=up[u][i];
            last[nodo][i+1]=last[u][i];
            if(up[u][0]==last[nodo][i]){
                up[nodo][i+1]=up2[u][i];
                last[nodo][i+1]=last2[u][i];
            }
            u=up2[nodo][i];
            up2[nodo][i+1]=up[u][i];
            last2[nodo][i+1]=last[u][i];
            if(last2[nodo][i]==up[u][0]){
                up2[nodo][i+1]=up2[u][i];
                last2[nodo][i+1]=last2[u][i];
            }
        }
    }
    int k=g[0];
    int res=0;
    for(int i=0;i<n;i++){
        int nodo=i;
        int ant=-1;
        for(int l=29;l>=0;l--){
            if((k>>l)&1){
                if(ant!=last[nodo][0]){
                    ant=last[nodo][l];
                    nodo=up[nodo][l];
                }else{
                    ant=last2[nodo][l];
                    nodo=up2[nodo][l];
                }
            }
        }
        if(nodo==P)res++;
    }
    answer(res);
}
/*
5 5 2
1 0
1 2
3 2
1 3
4 2
1
3 1
*/

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