Submission #40487

#	Time	Username	Problem	Language	Result	Execution time	Memory
40487		igzi	Tropical Garden (IOI11_garden)	C++14	49 / 100	62 ms	21292 KiB

garden

#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>
#define maxN 150005
#define INF LLONG_MAX
#define pll pair<long long,long long>

using namespace std;

vector <int> adj[maxN];
long long N,P,s,i,dis[2][maxN],k[2][maxN];
bool mar[maxN];
long long dfs(int n,int d){
long long y;
if(d>2*N) return INT_MAX;
if(adj[n].size()>0 && (adj[n][0]!=s || adj[n].size()==1)) {if(dis[0][n]!=INF) return dis[0][n];}
else {if(dis[1][n]!=INF) return dis[1][n];}
if(adj[n].size()>0 && (adj[n][0]!=s || adj[n].size()==1)) y=adj[n][0];
else y=adj[n][1];
if(adj[n][0]!=s || adj[n].size()==1) {
s=n;
dis[0][n]=dfs(y,d+1)+1;
if(n==adj[y][0]) k[0][n]=k[1][y];
else k[0][n]=k[0][y];
if(adj[n].size()==1){
    k[1][n]=k[0][n];
    dis[1][n]=dis[0][n];
}
return dis[0][n];}
else {
s=n;
dis[1][n]=dfs(y,d+1)+1;
if(n==adj[y][0]) k[1][n]=k[1][y];
else k[1][n]=k[0][y];
return dis[1][n];}
}
long long period(int x,int d){
if(d>3*N) return INF;
int y;
if(adj[x].size()>0 && (adj[x][0]!=s || adj[x].size()==1)) y=adj[x][0];
else y=adj[x][1];
if(y==P) return d+1;
s=x;
return period(y,d+1);
}

void count_routes(int n,int m,int p,int r[][2],int q,int g[]){
N=n;
P=p;
for(i=0;i<m;i++){
    adj[r[i][0]].push_back(r[i][1]);
    adj[r[i][1]].push_back(r[i][0]);
}
for(i=0;i<n;i++){
    dis[0][i]=dis[1][i]=INF;
}
dis[0][p]=0;
dis[1][p]=0;
k[0][p]=0;
k[1][p]=1;
for(i=0;i<n;i++){
s=-5;
dis[0][i]=dfs(i,0);
s=adj[i][0];
dis[1][i]=dfs(i,0);
}
long long t1,t2;
s=-5;
t1=period(p,0);
if(adj[p].size()>0) {
    s=adj[p][0];
    t2=period(p,0);
}
else t2=INF;
for(i=0;i<q;i++){
    long long ans=0;
    for(int j=0;j<n;j++){
        if(k[0][j]==0 && (dis[0][j]-g[i])%t1==0 && dis[0][j]<=g[i]) ans++;
        if(k[0][j]==1 && (dis[0][j]-g[i])%t2==0 && dis[0][j]<=g[i]) ans++;
    }
    answer(ans);
}
}

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