Problem: 2050C - Uninteresting Number
Language: C++20 (GCC 13-64)

Previous submission (verdict: Wrong answer on test 1):
#include <bits/stdc++.h>

using namespace std;

#define fastio()                      \
	ios_base::sync_with_stdio(false); \
	cin.tie(NULL);                    \
	cout.tie(NULL)
#define MOD 1000000007
#define MOD1 998244353
#define INF 1e18
#define nline "\n"
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
// typedef tree<pair<int, int>, null_type, less<pair<int, int>>, rb_tree_tag, tree_order_statistics_node_update > pbds; // find_by_order, order_of_key

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

void _print(ll t) { cerr << t; }
void _print(int t) { cerr << t; }
void _print(string t) { cerr << t; }
void _print(char t) { cerr << t; }
void _print(lld t) { cerr << t; }
void _print(double t) { cerr << t; }
void _print(ull t) { cerr << t; }

template <class T, class V>
void _print(pair<T, V> p);
template <class T>
void _print(vector<T> v);
template <class T>
void _print(set<T> v);
template <class T, class V>
void _print(map<T, V> v);
template <class T>
void _print(multiset<T> v);
template <class T, class V>
void _print(pair<T, V> p)
{
	cerr << "{";
	_print(p.ff);
	cerr << ",";
	_print(p.ss);
	cerr << "}";
}
template <class T>
void _print(vector<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T>
void _print(set<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T>
void _print(multiset<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T, class V>
void _print(map<T, V> v)
{
	cerr << "[ ";
	for (auto i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}

int main()
{
#ifndef ONLINE_JUDGE
	freopen("Error.txt", "w", stderr);
#endif
	int t;
	cin >> t;
	while (t--)
	{
		ll n;
		cin >> n;
		bool ans = false;
		map<int, int> mp;
		ll sum = 0;
		while (n > 0)
		{
			sum += n % 10;
			if (n % 10 == 2 || n % 10 == 3)
			{
				mp[n % 10]++;
			}
			n /= 10;
		}
		if (sum % 9 == 0)
		{
			ans = true;
		}
		else
		{
			ll k = mp[2];
			ll m = mp[3];
			for (int i = 0; i <= k; i++)
			{
				for (int j = 0; j <= m; j++)
				{
					if ((sum += (2 * i + 6 * j)) % 9 == 0)
					{
						ans = true;
						break;
					}
				}
				if (ans)
				{
					break;
				}
			}
		}
		cout << (ans ? "YES" : "NO") << '\n';
	}
}


Submission (verdict: Wrong answer on test 3):
#include <bits/stdc++.h>

using namespace std;

#define fastio()                      \
	ios_base::sync_with_stdio(false); \
	cin.tie(NULL);                    \
	cout.tie(NULL)
#define MOD 1000000007
#define MOD1 998244353
#define INF 1e18
#define nline "\n"
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define PI 3.141592653589793238462
#define set_bits __builtin_popcountll
#define sz(x) ((int)(x).size())
#define all(x) (x).begin(), (x).end()

typedef long long ll;
typedef unsigned long long ull;
typedef long double lld;
// typedef tree<pair<int, int>, null_type, less<pair<int, int>>, rb_tree_tag, tree_order_statistics_node_update > pbds; // find_by_order, order_of_key

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

void _print(ll t) { cerr << t; }
void _print(int t) { cerr << t; }
void _print(string t) { cerr << t; }
void _print(char t) { cerr << t; }
void _print(lld t) { cerr << t; }
void _print(double t) { cerr << t; }
void _print(ull t) { cerr << t; }

template <class T, class V>
void _print(pair<T, V> p);
template <class T>
void _print(vector<T> v);
template <class T>
void _print(set<T> v);
template <class T, class V>
void _print(map<T, V> v);
template <class T>
void _print(multiset<T> v);
template <class T, class V>
void _print(pair<T, V> p)
{
	cerr << "{";
	_print(p.ff);
	cerr << ",";
	_print(p.ss);
	cerr << "}";
}
template <class T>
void _print(vector<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T>
void _print(set<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T>
void _print(multiset<T> v)
{
	cerr << "[ ";
	for (T i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}
template <class T, class V>
void _print(map<T, V> v)
{
	cerr << "[ ";
	for (auto i : v)
	{
		_print(i);
		cerr << " ";
	}
	cerr << "]";
}

int main()
{
#ifndef ONLINE_JUDGE
	freopen("Error.txt", "w", stderr);
#endif
	int t;
	cin >> t;
	while (t--)
	{
		ll n;
		cin >> n;
		bool ans = false;
		map<int, int> mp;
		ll sum = 0;
		while (n > 0)
		{
			sum += n % 10;
			if (n % 10 == 2 || n % 10 == 3)
			{
				mp[n % 10]++;
			}
			n /= 10;
		}
		if (sum % 9 == 0)
		{
			ans = true;
		}
		else
		{
			ll k = mp[2];
			ll m = mp[3];
			for (int i = 0; i <= k; i++)
			{
				for (int j = 0; j <= m; j++)
				{
					ll sum1 = sum + 2 * i + 6 * j;
					if (sum1 % 9 == 0)
					{
						ans = true;
						break;
					}
				}
				if (ans)
				{
					break;
				}
			}
		}
		cout << (ans ? "YES" : "NO") << '\n';
	}
}