Ositus

#include <iostream>
#include <string>
#include <set>

using namespace std;

int find_ans(string str, unsigned long long int ind){
    set<char> chars;
    int ans = 0;
    if(ind == str.length() - 2){
        if(str[ind] == str[ind+1]) return 1;
        return 2;
    }
    if(ind > str.length() - 2)return 1;
    while(true){
        if(ind > str.length()-1 || chars.find(str[ind]) != chars.end())break;
        chars.insert(str[ind]);
        ++ind;
        ans += find_ans(str, ind);
    }
    return ans;
}

int main()
{
    string x; getline(cin, x);
    if(x.length() == 1)cout << 1;
    else{
    cout << find_ans(x, 0);}









    return 0;
}

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: TIME LIMIT EXCEEDED

Test 6

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 7

Group: 3

Verdict: RUNTIME ERROR