Greater Integers

input/code.cpp: In function 'bool cmp(std::__cxx11::string, std::__cxx11::string)':
input/code.cpp:27:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i= 0;i<s1.length();i++){
               ~^~~~~~~~~~~~

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

#define pb push_back
#define fr first
#define sc second
#define clr(a, x) memset(a, x, sizeof(a))
#define dbg(x) cout<<"("<<#x<<"): "<<x<<endl;
#define printvector(arr) for (auto it = arr.begin(); it != arr.end(); ++it) cout<<*it<<" "; cout<<endl;
#define all(v) v.begin(), v.end()
#define lcm(a, b) (a * b)/__gcd(a, b)
#define int long long int
#define printvecpairs(vec) for(auto it: vec) cout<<it.fr<<' '<<it.sc<<endl;
#define endl '\n'
#define float long double

const int MOD = 1e9 + 7;
const int INF = 2e15;
const int MAXN = 1e5 + 5;

bool cmp(string s1, string s2){
	if(s1.length() > s2.length()){
		return true; 
	} else if(s1.length() < s2.length()){
		return false;
	}
	for(int i= 0;i<s1.length();i++){
		if(s1[i]-'0'> s2[i]-'0'){
			return true;
		} else if(s1[i]-'0'< s2[i]-'0'){
			return false;
		}
	}
	return false;
}

signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    #ifdef LOCAL
    freopen("input.txt", "r", stdin);
    #endif
    int t;
    cin>>t;
    while(t--){
    	string s;
    	cin>>s;
    	int n = s.length();
    	string s1 = "";
    	for(int i= 0;i<n;i++){
    		s1 += s[0];
    	}
    	if(cmp(s1, s)){
    		cout<<s1<<endl;
    		continue;
    	}
    	string s2 = to_string((s[0]-'0')+1);
    	if(s[0] == '9'){
    		s2 = "11";
    	}
    	for(int i= 0;i<n-1;i++){
    		s2 += s2[0];
    	}
    	cout<<s2<<endl;
    }
    return 0;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: ACCEPTED