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13. Gray Code.cpp
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13. Gray Code.cpp
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#include "iostream"
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<string> vs;
typedef set<ll> sl;
typedef map<char, ll> mcl;
typedef pair<char, ll> pcl;
#define PB push_back
#define F first
#define S second
#define REP(i,a,b) for (ll i = a; i < b; i++)
#define REPR(i,a,b) for (ll i = a; i > b; i--)
#define REPJ(i,a,b,j) for (ll i = a; i < b; i+=j)
#define REPIT(it,o) for (auto it = o.begin(); it != o.end(); it++)
#define REPITR(it,o) for (auto it = o.rbegin(); it != o.rend(); it++)
vs rec(ll n){
if (n == 1) {
vs x {"0", "1"};
return x;
}
vs ans;
vs prev = rec(n-1);
ll l = prev.size();
REP(i,0,l){
ans.PB("0" + prev[i]);
}
REP(i,0,l){
ans.PB("1" + prev[l-1-i]);
}
return ans;
}
int main() {
ll n;
cin >> n;
vs v = rec(n);
REPIT(it, v){
cout << *it << "\n";
}
}