Problem p02548 (C++) — buggy submission, verdict: Time Limit Exceeded

/*
                    author         : TAPAN SAVANI
                    codeforces     : savanitapan2001
                    codechef       : savanitapan17
*/

/*
------------------------------------------------------------------------

░██╗░░░░░░░██╗░█████╗░██████╗░██╗░░██╗  ██╗░░██╗░█████╗░██████╗░██████╗░
░██║░░██╗░░██║██╔══██╗██╔══██╗██║░██╔╝  ██║░░██║██╔══██╗██╔══██╗██╔══██╗
░╚██╗████╗██╔╝██║░░██║██████╔╝█████═╝░  ███████║███████║██████╔╝██║░░██║
░░████╔═████║░██║░░██║██╔══██╗██╔═██╗░  ██╔══██║██╔══██║██╔══██╗██║░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝██║░░██║██║░╚██╗  ██║░░██║██║░░██║██║░░██║██████╔╝
░░░╚═╝░░░╚═╝░░░╚════╝░╚═╝░░╚═╝╚═╝░░╚═╝  ╚═╝░░╚═╝╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░

------------------------------------------------------------------------
*/

#include <bits/stdc++.h>
using namespace std;

#define HAPPY_CODING                                                           \\
  ios_base::sync_with_stdio(0);                                                \\
  cin.tie(NULL);                                                               \\
  cout.tie(NULL);
#define pb push_back
#define mp make_pair
#define Debug(x) cout << #x " = " << (x) << endl
#define SORT(a) sort(a.begin(), a.end())
#define SORTR(a) sort(a.rbegin(), a.rend())
#define mod 1000000007
#define pi 3.141592653589793238
#define ll long long int
#define ull unsigned long long
#define be begin()
#define en end()
#define FOR(i, a, b) for (long long int i = a; i < b; i++)
#define FORI(i, a, b) for (int i = a; i >= b; i--)

typedef vector<int> VI;
typedef vector<ll> VL;
typedef pair<int, int> PI;
typedef pair<ll, ll> PL;
typedef vector<PI> VPI;

int main() {
  HAPPY_CODING;

  int n, ans = 0;
  cin >> n;

  FOR(i, 1, n)
  ans += (n - 1) / i;

  cout << ans << "\\n";

  return 0;
}


Error: TLE

Fixed submission:

/*
                    author         : TAPAN SAVANI
                    codeforces     : savanitapan2001
                    codechef       : savanitapan17
*/

/*
------------------------------------------------------------------------

░██╗░░░░░░░██╗░█████╗░██████╗░██╗░░██╗  ██╗░░██╗░█████╗░██████╗░██████╗░
░██║░░██╗░░██║██╔══██╗██╔══██╗██║░██╔╝  ██║░░██║██╔══██╗██╔══██╗██╔══██╗
░╚██╗████╗██╔╝██║░░██║██████╔╝█████═╝░  ███████║███████║██████╔╝██║░░██║
░░████╔═████║░██║░░██║██╔══██╗██╔═██╗░  ██╔══██║██╔══██║██╔══██╗██║░░██║
░░╚██╔╝░╚██╔╝░╚█████╔╝██║░░██║██║░╚██╗  ██║░░██║██║░░██║██║░░██║██████╔╝
░░░╚═╝░░░╚═╝░░░╚════╝░╚═╝░░╚═╝╚═╝░░╚═╝  ╚═╝░░╚═╝╚═╝░░╚═╝╚═╝░░╚═╝╚═════╝░

------------------------------------------------------------------------
*/

#include <bits/stdc++.h>
using namespace std;

#define HAPPY_CODING                                                           \\
  ios_base::sync_with_stdio(0);                                                \\
  cin.tie(NULL);                                                               \\
  cout.tie(NULL);
#define pb push_back
#define mp make_pair
#define Debug(x) cout << #x " = " << (x) << endl
#define SORT(a) sort(a.begin(), a.end())
#define SORTR(a) sort(a.rbegin(), a.rend())
#define mod 1000000007
#define pi 3.141592653589793238
#define ll long long int
#define ull unsigned long long
#define be begin()
#define en end()
#define FOR(i, a, b) for (long long int i = a; i < b; i++)
#define FORI(i, a, b) for (int i = a; i >= b; i--)

typedef vector<int> VI;
typedef vector<ll> VL;
typedef pair<int, int> PI;
typedef pair<ll, ll> PL;
typedef vector<PI> VPI;

long long int Count(long long int n) {
  long long int c = 0;
  for (long long int i = 1; i <= sqrt(n); i++) {
    if (i * i == n)
      c++;
    else if (n % i == 0)
      c += 2;
  }

  return c;
}

int main() {
  HAPPY_CODING;

  long long int total = 0, n;

  cin >> n;

  for (long long int i = 1; i < n - 1; i++) {
    total += Count(n - i);
  }

  cout << total + 1 << "\\n";

  return 0;
}