Kertoma

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef unsigned long long int ull;
 
using namespace std::chrono;
int main(){
    //  freopen("input.txt", "r", stdin);

    ll l[10];

    ll s = 0;

    for (int i = 0; i < 10; i++)
    {
        cin >> l[i];
        s += l[i];
    }

    ll a = 0;
    if(s < 4){
        //ratkaise nämä
        if(s==3){
            if(l[7] == 1){
                cout << 6;
                return 0;
            } 
            else{
                cout << 5;
                return 0;
            }
        }
        else if(s==2){
            cout << 4;
            return 0;
        }
        else{
            if(l[6] == 1) {
                cout << 3;
                return 0;
            }
            else {
                cout << 2;
                return 0;
            }
        }
    }
    else{
        ull k = 1;
        ll c;
        for (int j = 1; j < 25207; j++)
        {
            k *= j;
            // cout << k << " " << j << " " << a << " "<< int(log10(k))<< endl;
            if((a+int(log10(k))) >= (s-1)){
                c = j;
                break;
            }
            while(k>=1e15){
                k = ull(k/1e1);
                a += 1;
            }
            
        }
        a += int(log10(k));
        cout << c;
    }
}

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: 1, 2, 3

Verdict: ACCEPTED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 2, 3

Verdict: ACCEPTED

Test 8

Group: 2, 3

Verdict: ACCEPTED

Test 9

Group: 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: WRONG ANSWER

Test 14

Group: 3

Verdict: WRONG ANSWER

Test 15

Group: 3

Verdict: WRONG ANSWER

Test 16

Group: 3

Verdict: WRONG ANSWER