Ositus

input/code.cpp: In function 'int main()':
input/code.cpp:25:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (ll i=0;i<s.size();i++)
               ~^~~~~~~~~

using namespace std;
#include <iostream>
#include <vector>
#include <set>
#include <queue>

#define ll long long

ll M = 1e9 + 7, x = 0;

int main()
{
	string s;
	cin >> s;
	ll n = s.size() - 1;
	for (ll b = 0; b < (1 << n); b++)
	{
		queue<ll> v;
		for (ll i = 0; i < n; i++)
		{
			if (b & (1 << i))v.push(i+1);
		}
		bool b1 = true;
		string t;
		for (ll i=0;i<s.size();i++)
		{
			t.push_back(s[i]);
			if (!v.empty())
			{
				if (v.front() == i + 1)
				{
					set<char> st(t.begin(), t.end()); v.pop();
					if (st.size() < t.size())
					{
						b1 = false; break;
					}
					t.clear();
				}
			}
		}
		if (b1)
		{
			set<char> st(t.begin(), t.end());
			if (st.size() < t.size())b1 = false;
		}
		if (b1)x++;
	}
	cout << x % M;
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 1, 2, 3

Verdict: ACCEPTED

Test 4

Group: 1, 2, 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: WRONG ANSWER

Test 6

Group: 3

Verdict: WRONG ANSWER

Test 7

Group: 3

Verdict: WRONG ANSWER