Vuodet

input/code.cpp: In function 'int main()':
input/code.cpp:20:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     while (yi < y.size() && si < s.size()) {
      |            ~~~^~~~~~~~~~
input/code.cpp:20:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     while (yi < y.size() && si < s.size()) {
      |                             ~~~^~~~~~~~~~
input/code.cpp:26:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |     if (yi == y.size()) res.push_back(i);
      |         ~~~^~~~~~~~~~~

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  ll a, b;
  cin >> a >> b;

  vector<int> res;
  for (ll i = a; i <= b; ++i) {
    ll x = i * 1337;
    string s = to_string(x);
    string y = to_string(i);

    int si = 0;
    int yi = 0;
    while (yi < y.size() && si < s.size()) {
      if (s[si] == y[yi]) {
        ++si;
        ++yi;
      } else ++si;
    }
    if (yi == y.size()) res.push_back(i);
  }

  cout << res.size() << endl;
  for (int x : res) cout << x << endl;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED