Lista

input/code.cpp: In function 'int main()':
input/code.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(s.length()<prevlen){
            ~~~~~~~~~~^~~~~~~~
input/code.cpp:33:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         else if(s.length()>prevlen){
                 ~~~~~~~~~~^~~~~~~~
input/code.cpp:36:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i = 0; i < s.length(); ++i){
                            ~~^~~~~~~~~~~~
input/code.cpp:65:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             for(int i = 0; i < s.length(); ++i){
                            ~~^~~~~~~~~~~~
input/code.cpp:113:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                     if(i==s.length()-1){
                        ~^~~~~~~~~~~~~~
input/code....

#include <bits/stdc++.h>

#define ll long long
#define mp make_pair
#define pb push_back
#define F first
#define S second

using namespace std;

const int N = (int)1e5;
const ll inf = (ll)1e18;
vector<string> ans;

int main()
{
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n; cin >> n;
    ll prev = 0, prevlen = 0;
    string prevstring = "";
    ll pows[10];
    pows[0] = 1;
    for(int i = 1; i < 10; ++i){
        pows[i] = 10 * pows[i-1];
    }

    while(n--){
        string s; cin >> s;
        if(s.length()<prevlen){
            cout << "IMPOSSIBLE\n";
            return 0;
        }
        else if(s.length()>prevlen){
            string new_s = "";
            ll new_prev = 0;
            for(int i = 0; i < s.length(); ++i){
                char c = s[i];
                if(c=='?'){
                    if(!i){
                        new_s+="1";
                        new_prev += pows[s.length()-i-1];
                    }
                    else{
                        new_s+="0";
                    }
                }
                else{
                    int x = c - '0';
                    new_s += string(1, c);
                    new_prev += pows[s.length()-i-1] * x;
                }

            }
            prev = new_prev;
            prevlen = new_s.length();
            prevstring = new_s;
            ans.pb(prevstring);
        }
        else{

            bool tight = 1;
            ll new_prev = 0;
            string new_s = "";

            for(int i = 0; i < s.length(); ++i){

                char c = s[i];

                if(c!='?'){

                    int prev_x = prevstring[i] - '0';
                    int x = c - '0';


                if(tight){

                    if(prev_x>x){
                        cout << "IMPOSSIBLE\n";
                        return 0;
                    }

                    else if(prev_x<x){
                        tight = 0;
                        new_s+=string(1, c);
                        new_prev += pows[s.length()-i-1] * x;
                    }
                    else{
                        new_s+=string(1, c);
                        new_prev += pows[s.length()-i-1] * x;
                    }
                }

                else if(!tight){
                    new_s += string(1, c);
                    new_prev += pows[s.length()-i-1] * x;
                }
            }

            else if(c=='?'){

                if(!tight){
                    if(i==0){
                        new_s+="1";
                        new_prev += pows[s.length()-1];
                    }
                    else{
                        new_s+="0";
                    }
                }

                else if(tight){

                    if(i==s.length()-1){
                        if(prevstring[i]=='9'){
                            cout << "IMPOSSIBLE\n";
                            return 0;
                        }
                        char new_c = prevstring[i];
                        int add = new_c - '0';
                        add++;
                        //cout << "newwccwew: " << new_c << " " << add << "\n";
                        new_s += to_string(add);
                        prev += pows[s.length()-i-1] * add;
                        continue;

                    }
                    //we want to check the next element whether it is fine
                    bool putequal = 1;
                    for(int k = i+1; k < s.length(); ++i){
                        if(s[k]=='?'&&prevstring[k]!='9')break;
                        else if(s[k]=='?'&&prevstring[k]=='9'&& k!= s.length()-1)continue;
                        else if(s[k]=='?'&&prevstring[k]=='9' && k == s.length()-1){
                            putequal=0;
                            break;
                        }
                        int cur = s[k] - '0';
                        int pr = prevstring[k] - '0';
                        if(cur>pr)break;
                        else if(cur==pr)continue;
                        putequal = 0;
                        break;

                    }
                    if(putequal){

                        char newc = prevstring[i];
                        int add = newc - '0';

                        new_s += string(1, newc);
                        new_prev += pows[s.length()-i-1] * add;

                    }
                    else{
                        tight = 0;
                        if(prevstring[i]=='9'){
                            cout << "IMPOSSIBLE\n";
                            return 0;
                        }
                        int newc = prevstring[i];
                        int add = newc - '0';
                        add++;
                        newc = char(add);

                        new_s += string(1, newc);
                        new_prev += pows[s.length()-i-1] * add;

                    }


                }


            }
        }
            prev = new_prev;
            prevstring = new_s;
            prevlen = new_s.length();
            ans.pb(prevstring);
        }
    }
    for(auto x : ans){
        cout << x << "\n";
    }

    return 0;
}

Test 1

Group: 1, 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 2

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 3

Verdict: WRONG ANSWER

Test 9

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 3

Verdict: TIME LIMIT EXCEEDED