Lukujono

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

#define M 1000000007

map<int, ll> u;

ll ans(int n) {
    if (u[n] != 0) return u[n];
    ll s = 0;
    for (int j = 2; j <= n / 2; ++j) {
        ll val = n / j;
        /*ll lst = j;
        for (ll k = n; k >= 1; k /= 2) {
            while (val == n / (lst + k)) lst += k;
        }*/
        ll lst = n / val;
        s += ans(val) * (lst - j + 1);
        j = lst;
    }
    s += n - n / 2;
    u[n] = s;
    return s;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    ll n;
    cin >> n;

    u[0] = 0;
    u[1] = 1;

    cout << ans(n) << "\n"; 

    return 0;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 1

Verdict: ACCEPTED

Test 7

Group: 1

Verdict: ACCEPTED

Test 8

Group: 1

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED

Test 15

Group: 2

Verdict: ACCEPTED

Test 16

Group: 2

Verdict: ACCEPTED

Test 17

Group: 3

Verdict: ACCEPTED

Test 18

Group: 3

Verdict: ACCEPTED

Test 19

Group: 3

Verdict: ACCEPTED

Test 20

Group: 3

Verdict: ACCEPTED

Test 21

Group: 3

Verdict: ACCEPTED

Test 22

Group: 3

Verdict: ACCEPTED

Test 23

Group: 3

Verdict: ACCEPTED

Test 24

Group: 3

Verdict: ACCEPTED