Ositus

input/code.cpp: In function 'long long int partitioning(std::__cxx11::string, long long int)':
input/code.cpp:20:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (long long i = 0; i < s.length(); i++) {
                           ~~^~~~~~~~~~~~

/**
 * Datatähti 2022 alku
 * Ositus (Partitioning)
 * @author TRS
 */
#include <bits/stdc++.h>
using namespace std;
//Constants
#define infinity 0x3f3f3f3f
#define linfinity 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007
const int MX = 1000001;
int partitions[MX];
long long partitioning(string s, long long start) {
    if (s.length() <= 1) {
        return 1;
    }
    long long answer = 0;
    int found;
    for (long long i = 0; i < s.length(); i++) {
        found = 0;
        for (long long j = 0; j < i; j++) {
            if (s.at(i) == s.at(j)) {
                found = 1;
                break;
            }
        }
        if (found) {
            break;
        }
        if (partitions[start + i + 1] == 0) {
            answer += partitioning(s.substr(i + 1), start + i + 1);
        }
        else {
            answer += partitions[start + i + 1];
        }
    }
    answer %= MOD;
    partitions[start] = answer;
    return answer;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    string s;
    getline(cin, s);
    if (s.length() == 1) {
        cout<<1<<"\n";
        return 0;
    }
    cout<<partitioning(s, 0)<<"\n";
    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: ACCEPTED

Test 6

Group: 3

Verdict: ACCEPTED

Test 7

Group: 3

Verdict: RUNTIME ERROR