Kertoma

#include <iostream>
#include <vector>
#include <algorithm>
#include <map>
#include <set>
#include <cmath>
#include <numeric>
#include <random>
#include <chrono>
#include <ctime>
#define int long long
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
using namespace std;
const int INF = 1e18;

int f(int n) {
    return (log10l(sqrtl(2 * 3.1415 * (long double)n)) + log10l((long double)n / 2.718) * (long double)n) + 1;
}

signed main() {
    //freopen("file.in", "r", stdin);
    //freopen("file.out", "w", stdout);
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.precision(20);
    cout.setf(ios::fixed);
    vector<int> x(10);
    int sum = 0;
    for (int i = 0; i < 10; ++i) {
        cin >> x[i];
        sum += x[i];
    }
    vector<int> ch3 = {0, 0, 0, 0, 0, 0, 1, 0, 0, 0};
    vector<int> ch2 = {0, 0, 1, 0, 0, 0, 0, 0, 0, 0};
    vector<int> ch4 = {0, 0, 1, 0, 1, 0, 0, 0, 0, 0};
    vector<int> ch5 = {1, 1, 1, 0, 0, 0, 0, 0, 0, 0};
    vector<int> ch6 = {1, 0, 1, 0, 0, 0, 0, 1, 0, 0};
    if (x == ch3) {
        cout << 3 << endl;
        return 0;
    }
    if (x == ch2) {
        cout << 2 << endl;
        return 0;
    }
    if (x == ch4) {
        cout << 4 << endl;
        return 0;
    }
    if (x == ch5) {
        cout << 5 << endl;
        return 0;
    }
    if (x == ch6) {
        cout << 6 << endl;
        return 0;
    }
    int l = 1, r = 300000;
    while (l + 1 < r) {
        int m = (l + r) / 2;
        if (f(m) >= sum) {
            r = m;
        } else {
            l = m;
        }
    }
    int fi = f(l), s = f(r);
    if (sum - fi < sum - s) {
        cout << l << endl;
        return 0;
    }
    cout << r << endl;
    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: 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: WRONG ANSWER

Test 16

Group: 3

Verdict: WRONG ANSWER