Lista

input/code.cpp: In function 'int main()':
input/code.cpp:56:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=1;i<s.size();i++){
                     ~^~~~~~~~~

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

int n, a, b, potenssi;
bool possible;
string s;
vector<string> v;
vector<int> vas;

int main(){
    cin>>n;
    possible =true;
    for(int i=0;i<n;i++){
        cin>>s;
        v.push_back(s);
    }
    s=v.back();
    potenssi=1;
    
    for(int i=s.size()-1;i>=0;i--){
        if(s[i]=='?'){
            a+=potenssi*9;
        }else{
            a+=potenssi*(s[i]-'0');
        }
        potenssi *=10;
    }
    v.pop_back();
    vas.push_back(a);
    
    while(v.size()>0){
        b=a;
        potenssi=1;
        s=v.back();
        a=0;
        for(int i=s.size()-1;i>=0;i--){
            if(s[i]!='?'){
                a+= potenssi*(s[i]-'0');
            }
            potenssi *=10;
        }
        
        potenssi/=10;
        
        if(s[0]=='?'){
            a+= potenssi;
            for(int j=2;j<10;j++){
                if(a+potenssi<b){
                    a+=potenssi;
                }
            }
        }
        if(a>=b){
            possible = false;
        }
        for(int i=1;i<s.size();i++){
            potenssi /= 10;
            if(s[i]=='?'){
                for(int j=1;j<10;j++){
                    if(a+potenssi<b){
                        a+=potenssi;
                    }
                }
            }
        }
        v.pop_back();
        vas.push_back(a);
    }
    if(possible){
        for(int i=n-1;i>=0;i--){
            cout<<vas[i]<<"\n";
        }
    }else{
        cout<<"IMPOSSIBLE";
    }
    
}

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