Greater Integers

input/code.cpp: In function 'int main()':
input/code.cpp:41:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < V.size(); i++){
                     ~~^~~~~~~~~~

#include <iostream>
#include <vector>
 
using namespace std;
 
int main(){
  int t;
  long long n;
  cin >> t;
  long long mini = 9;
  
  for (int i = 0; i<t; i++){
    vector<int> V;
    mini = 9;
    cin >> n;
    while(n > 0){
      V.push_back(n%10);
      mini = min(mini, n%10);
      n /= 10;      
    }
 
    int a = V[V.size()-1];
    int ciffer = a;
    if (a == 9 && mini == 9){
      ciffer = 1;
      V.push_back(1);
    } else if (a == mini){
      ciffer++;
    } else {
 
      for(int i = V.size()-2; i>=0; i++){
	if (V[i] > a){
	  ciffer++;
	  break;
	} else if (V[i] < a){
	  break;
	}
      }
    }
       
    for (int i = 0; i < V.size(); i++){
      cout << ciffer;
    }
    cout << endl;
  }
 
  
 
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: WRONG ANSWER