Ositus

input/code.cpp: In function 'uint64_t sana_maara(std::__cxx11::string, int)':
input/code.cpp:14:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i = s; i < t.length(); i++) {
                ~~^~~~~~~~~~~~
input/code.cpp:23:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(i == t.length()) {
        ~~^~~~~~~~~~~~~
input/code.cpp:33:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     while(i != t.length()) {
           ~~^~~~~~~~~~~~~

#include <iostream>
#include <string>

using namespace std;

const uint64_t AAAA = 1000000007;

uint64_t sana_maara(string t, int s)
{
    uint64_t maara = 0;
    char kirjaimet[26] = {0};
    int i;

    for(i = s; i < t.length(); i++) {
        char kirjain = t[i];
        if(kirjaimet[kirjain - 'a'] != 0) {
            break;
        }

        kirjaimet[kirjain - 'a'] = 1;
    }

    if(i == t.length()) {
        return 1 << (i - s - 1) % AAAA;
    }

    for(int j = 0; j < 26; j++) {
        kirjaimet[j] = 0;
    }
    kirjaimet[t[s] - 'a'] = 1;

    i = s + 1;
    while(i != t.length()) {
        maara += sana_maara(t, i);
        
        if(kirjaimet[t[i] - 'a'] != 0) {
            break;
        }
        kirjaimet[t[i] - 'a'] = 1;
        i++;
    }
    
    return maara % AAAA;
}

int main()
{
    string t;
    cin >> t;
    
    cout << sana_maara(t, 0) << endl;
}

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