ID

input/code.cpp: In function 'std::string next(std::string)':
input/code.cpp:20:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0; i < 10 - s.size(); i++) s2 += '0';
                                  ^
input/code.cpp: In function 'int main()':
input/code.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(ids.size() < n){
                      ^
input/code.cpp:43:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(ids.size() == n) cout << current << endl;
                      ^

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <string>
#include <utility>
#include <algorithm>
#include <iomanip>
#include <set>

using namespace std;

typedef long long LL;

set<string> ids;

string next(string x){
  string s = to_string(stoi(x)+1);
  string s2;
  for(int i = 0; i < 10 - s.size(); i++) s2 += '0';
  return s2 + s;
}

bool compare(string a, string b){
  int dist = 0;
  for(int i = 0; i < 10; i++){
    if(a[i] != b[i]) dist++;
  }
  return dist > 1;
}

int main(){
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n; cin >> n;
  string current = "0000000000";
  while(ids.size() < n){
    bool good = true;
    for(auto s : ids){
      if(!compare(current,s)) good = false;
    }
    if(good) ids.insert(current);
    if(ids.size() == n) cout << current << endl;
    current = next(current);
  }
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED