Problem: 2050D - Digital string maximization
Language: C++23 (GCC 14-64, msys2)

Previous submission (verdict: Wrong answer on test 1):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cerr.rdbuf(cout.rdbuf());
#define f(i,a,b) for (ll (i)=(a); (i)<(b); (i)++)
#define rf(i,a,b) for (ll (i)=(a); (i)>=(b); (i)--)
#define vll vector<ll>
#define vvll vector<vll>
#define in(n) ll n; cin>>n;
#define sin(s) string (s); cin>>(s);
#define vin(v,n) vll (v)(n); f(i,0,n)cin>>(v)[i];
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define sort(v) sort(all(v));
#define rsort(v) sort(v) reverse(all(v));
#define pYES cout<<"YES\n";
#define pNO cout<<"NO\n";
const ll mod = 1000000007;

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x << " = "; _print(x); cerr << endl;
#else
#define debug(x)
#endif

template <typename T>
void _print(T x) { cerr << x; }
template <typename T, typename V>
void _print(pair<T, V> p) { cerr << "{"; _print(p.first); cerr << ", "; _print(p.second); cerr << "}"; }
template <typename T>
void _print(vector<T> v) { cerr << "[ "; for (T i : v) { _print(i); cerr << " "; } cerr << "]"; }
template <typename T>
void _print(set<T> s) { cerr << "{ "; for (T i : s) { _print(i); cerr << " "; } cerr << "}"; }
template <typename T, typename V>
void _print(map<T, V> m) { cerr << "{ "; for (auto i : m) { _print(i); cerr << " "; } cerr << "}"; }
/* *********************Template ends here************** */


void solve() {
    sin(s)
    ll n=s.length();
    // rf(k,n-1,1){
        rf(i,n-1,1){
            ll l=i-1;
            ll r=i;
            while(l>=0 && s[r]-s[l]>1){
                s[r]--;
                swap(s[l],s[r]);
                l--; r--;
            }
        }
    // }
    cout<<s<<endl;
}

int main() {
    fast;
    int t = 1;
    cin >> t;
    while(t--) solve();
}

Submission (verdict: Wrong answer on test 3):
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define fast ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);cerr.rdbuf(cout.rdbuf());
#define f(i,a,b) for (ll (i)=(a); (i)<(b); (i)++)
#define rf(i,a,b) for (ll (i)=(a); (i)>=(b); (i)--)
#define vll vector<ll>
#define vvll vector<vll>
#define in(n) ll n; cin>>n;
#define sin(s) string (s); cin>>(s);
#define vin(v,n) vll (v)(n); f(i,0,n)cin>>(v)[i];
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define sort(v) sort(all(v));
#define rsort(v) sort(v) reverse(all(v));
#define pYES cout<<"YES\n";
#define pNO cout<<"NO\n";
const ll mod = 1000000007;

#ifndef ONLINE_JUDGE
#define debug(x) cerr << #x << " = "; _print(x); cerr << endl;
#else
#define debug(x)
#endif

template <typename T>
void _print(T x) { cerr << x; }
template <typename T, typename V>
void _print(pair<T, V> p) { cerr << "{"; _print(p.first); cerr << ", "; _print(p.second); cerr << "}"; }
template <typename T>
void _print(vector<T> v) { cerr << "[ "; for (T i : v) { _print(i); cerr << " "; } cerr << "]"; }
template <typename T>
void _print(set<T> s) { cerr << "{ "; for (T i : s) { _print(i); cerr << " "; } cerr << "}"; }
template <typename T, typename V>
void _print(map<T, V> m) { cerr << "{ "; for (auto i : m) { _print(i); cerr << " "; } cerr << "}"; }
/* *********************Template ends here************** */


void solve() {
    sin(s)
    ll n=s.length();
    f(k,0,10){
        rf(i,n-1,1){
            ll l=i-1;
            ll r=i;
            while(l>=0 && s[r]-s[l]>1){
                s[r]--;
                swap(s[l],s[r]);
                l--; r--;
            }

        }
    }
    cout<<s<<endl;
}

int main() {
    fast;
    int t = 1;
    cin >> t;
    while(t--) solve();
}