This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#include "prison.h"
using namespace std;
string convert_to_3(int val){
string ans="";
while(val){
ans+=(val%3)+'0';
val/=3;
}
while(ans.size()<13)ans+='0';
return ans;
}
std::vector<std::vector<int>> devise_strategy(int N) {
int n=N;
vector<vector<int>> ans(25,vector<int>(N+1));
ans[0][0]=0;
for(int i=1;i<=n;i++){
int next_index=7;
string s=convert_to_3(i);
ans[0][i]=next_index*3+(s[next_index]-'0'+1);
}
for(int i=1;i<=24;i++){
int current_index=(i-1)/3;
int current_value=(i-1)%3;
ans[i][0]=current_index%2;
for(int j=1;j<=n;j++){
string s =convert_to_3(j);
if(s[current_index]<current_value+'0'){
if(ans[i][0])ans[i][j]=-2;
else ans[i][j]=-1;
}
else if(s[current_index]>current_value+'0'){
if(ans[i][0])ans[i][j]=-1;
else ans[i][j]=-2;
}
else {
int next_index=current_index-1;
if(next_index>=0) ans[i][j]=next_index*3+(s[next_index]-'0'+1);
}
}
}
return ans;
}
// int simulate(vector<vector<int>> ans, int a, int b){
// int cur=0;
// while(cur>=0){
// // cout<<cur<<endl;
// if(!ans[cur][0])cur=ans[cur][a];
// else cur=ans[cur][b];
// }
// return cur;
// }
// int main(){
// int n;cin>>n;
// vector<vector<int>> ans=devise_strategy(abs(n));
// if(n>0){
// for(int i=1;i<=n;i++){
// for(int j=1;j<=n;j++){
// if(i==j)continue;
// if(simulate(ans,i,j)==-1 ^ i<j){
// cout<<"failed when "<<i<<" "<<j<<" "<<simulate(ans,i,j)<<endl;
// return 0;
// }
// }
// }
// }
// else {
// while(1){
// int a, b;
// cin>>a>>b;
// cout<<simulate(ans,a,b)<<endl;
// }
// }
// }
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