Kertoma

#include<vector>
#include <iostream>
#include <cmath>

using namespace std;

int main()
{
    vector<int> v;
    int p=0;
    for(int i=0; i<10; i++) {
        int a;
        cin >> a;
        v.push_back(a);
        p+=a;
    }
    
    if (p==1) {
        if (v[2]==1) {
            cout << 2;
            return 0;
        }
        cout << 3;
        return 0;
    }
    
    if(p==3) {
        if (v[1]==1) {
            cout << 5;
            return 0;
        }
        cout << 6;
        return 0;
    }
    double nu=2;
    int i=2;
    int ex=0;
    while(true) {
        if (nu>10) {
            /*double sa=0;
            modf(nu, &sa);
            string s=to_string(sa);
            int s= int(log10(nu) + 1);
            nu/=pow(10,s);
            ex+=s; */
            while (nu>=10) {
                nu/=10;
                ex++;
            }
        }
        if(ex+1==p) {
            cout << i;
            return 0;
        }
        
        i++;
        nu*=i;
    }
}

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: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED

Test 16

Group: 3

Verdict: ACCEPTED