Lista

input/code.cpp: In function 'int main()':
input/code.cpp:32:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (rivi[j] != '0' + num % 10) {

#include <iostream>
#include <sstream>

uint32_t mypow(uint32_t n, uint32_t p) {
  uint32_t res = 1;
  while (p--)
    res *= n;
  return res;
}

int main() {
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);

  uint32_t n;
  std::cin >> n;
  uint32_t ed = 0;
  std::stringstream tulokset;
  for (uint32_t i = 0; i < n; ++i) {
    std::string rivi;
    std::cin >> rivi;
    uint32_t l = mypow(10, rivi.size() - 1);
    bool outdone = false;
    for (uint32_t tst = std::max(ed + 1, l); tst < 10 * l; ++tst) {
      uint32_t num = tst;
      bool done = true;
      for (uint32_t j = rivi.size() - 1; j < rivi.size(); --j) {
        if (rivi[j] == '?') {
          num /= 10;
          continue;
        }
        if (rivi[j] != '0' + num % 10) {
          uint32_t newtst = num / 10 * mypow(10, rivi.size() - j) +
                            (rivi[j] - '0') * mypow(10, rivi.size() - j - 1) -
                            1;
          while (newtst < tst)
            newtst += mypow(10, rivi.size() - j);
          tst = newtst;
          done = false;
          break;
        }
        num /= 10;
      }
      if (done) {
        ed = tst;
        tulokset << tst << '\n';
        outdone = true;
        break;
      }
    }
    if (!outdone) {
      std::cout << "IMPOSSIBLE\n";
      return 0;
    }
  }
  std::cout << tulokset.str();
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 2, 3

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 3

Verdict: ACCEPTED

Test 9

Group: 3

Verdict: ACCEPTED

Test 10

Group: 3

Verdict: ACCEPTED