Lista

input/code.cpp: In function 'int rec(int, int)':
input/code.cpp:11:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(a==p[i].size())return -1;
        ~^~~~~~~~~~~~~
input/code.cpp:14:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
             if(a==p[i].size()-1){
                ~^~~~~~~~~~~~~~~
input/code.cpp:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(;a<s[0].size();a++){
              ~^~~~~~~~~~~~

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

int n;
string s[1000];
string p[1000];

int rec(int i,int a){
    if(a==p[i].size())return -1;
    if(i==0){
        if(s[i][a]=='?'){
            if(a==p[i].size()-1){
                s[i][a]='1';
                return 0;
            }
            else s[i][a]='0';

            int r=rec(i,a+1);
            if(r==-1){
                if(p[i][a]=='9')return -1;
                p[i][a]++;
                return 0;
            }
            return 0;
        } else {
            int r=rec(i,a+1);
            if(r==-1){
                if(p[i][a]=='9')return -1;
                return 0;
            }
            return 0;
        }
    }
    if(s[i][a]=='?'){
        p[i][a]=p[i-1][a];
        int r=rec(i,a+1);
        if(r==-1){
            if(p[i][a]=='9')return -1;
            p[i][a]++;
            return 0;
        }
        return 0;
    } else if(s[i][a]==s[i-1][a]){
        int r=rec(i,a+1);
        if(r==-1){
            return -1;
        }
        return 0;
    } else if(s[i][a]>p[i-1][a]){
        a++;
        for(;a<s[0].size();a++){
            p[i][a]='0';
        }
        return 0;
    } else return -1;
}

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

    cin>>n;
    for(int i=0;i<n;i++)cin>>s[i];
    for(int i=0;i<n;i++){
        p[i]=s[i]=string(s[n-1].size()-s[i].size(),'0')+s[i];
        if(rec(i,0)==-1){
            cout<<"IMPOSSIBLE\n";
            return 0;
        }
    }
    for(int i=0;i<n;i++){
        cout<<p[i]<<"\n";
    }
}

Test 1

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 2

Group: 2, 3

Verdict: WRONG ANSWER

Test 3

Group: 3

Verdict: WRONG ANSWER

Test 4

Group: 1, 2, 3

Verdict: WRONG ANSWER

Test 5

Group: 1, 2, 3

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::length_error'
  what():  basic_string...

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 3

Verdict: WRONG ANSWER

Test 9

Group: 3

Verdict: WRONG ANSWER

Test 10

Group: 3

Verdict: WRONG ANSWER