Problem p02696 (C++)

Buggy submission (status: Time Limit Exceeded):
/*
                    !!!!!!
                    !!!!!!!!!!
                     !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!
                      !!!!!!!!!!!!
                      !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!
                        !!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!                                  !!!!!
                  !!!!!!!!!!!!!!!!!!!                               !!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!                 !         !!!!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!              !!     !!!!!!!!!!!!
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!      !!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!
              !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  !!!!!!!!!!!!
       !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!!!!
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      !!!!!
          !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !
          !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!
                   !!!!!!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                          !!!!!!!!
                          !!!!!!
                           !!!!
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define MAXN 200005
#define mod 998244353
#define inf LLONG_MAX / 3
#define pb push_back
using namespace std;
/*
 *  author  :  vivekcrux
 */
typedef long long ll;
typedef pair<ll, ll> pll;

ll power(ll x, ll y, ll m = mod) {
  ll ans = 1;
  while (y > 0) {
    if (y & 1) {
      ans = (ans * x) % m;
    }
    x = (x * x) % m;
    y /= 2;
  }
  return ans % m;
}

ll modInverse(ll a, ll m = mod) {
  ll m0 = m;
  ll y = 0, x = 1;

  if (m == 1)
    return 0;

  while (a > 1) {
    // q is quotient
    ll q = a / m;
    ll t = m;

    // m is remainder now, process same as
    // Euclid's algo
    m = a % m, a = t;
    t = y;

    // Update y and x
    y = x - q * y;
    x = t;
  }

  // Make x positive
  if (x < 0)
    x += m0;

  return x;
}

int main() {
  /*#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
  #endif*/

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  ll T = 1;
  // cin>>T;
  while (T--) {
    ll n, k, i, j, ans = 0;
    ll a, b;
    cin >> a >> b >> n;
    for (i = 0; i <= min(n, b); i++) {
      ans = max(ans, ((a * i) / b) - (a * (i / b)));
    }
    cout << ans;
  }
  return 0;
}


Fixed submission:
/*
                    !!!!!!
                    !!!!!!!!!!
                     !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!
                      !!!!!!!!!!!!
                      !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!
                        !!!!!!!!!!
                       !!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!                                  !!!!!
                  !!!!!!!!!!!!!!!!!!!                               !!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!                 !         !!!!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!              !!     !!!!!!!!!!!!
           !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!      !!!!!!!!
            !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!
              !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!  !!!!!!!!!!!!
       !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!!!!
      !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!      !!!!!
          !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !!!
        !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!        !
          !!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
           !!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!!
                  !!!!!!!!!!!!!!!!!!!!!!!!!
                   !!!!!!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!!
                    !!!!!!!!!!!!!!!!!!!
                     !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!!
                      !!!!!!!!!!!!!!!
                       !!!!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                        !!!!!!!!!!!!
                          !!!!!!!!
                          !!!!!!
                           !!!!
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/trie_policy.hpp>

#define MAXN 200005
#define mod 998244353
#define inf LLONG_MAX / 3
#define pb push_back
using namespace std;
/*
 *  author  :  vivekcrux
 */
typedef long long ll;
typedef pair<ll, ll> pll;

ll power(ll x, ll y, ll m = mod) {
  ll ans = 1;
  while (y > 0) {
    if (y & 1) {
      ans = (ans * x) % m;
    }
    x = (x * x) % m;
    y /= 2;
  }
  return ans % m;
}

ll modInverse(ll a, ll m = mod) {
  ll m0 = m;
  ll y = 0, x = 1;

  if (m == 1)
    return 0;

  while (a > 1) {
    // q is quotient
    ll q = a / m;
    ll t = m;

    // m is remainder now, process same as
    // Euclid's algo
    m = a % m, a = t;
    t = y;

    // Update y and x
    y = x - q * y;
    x = t;
  }

  // Make x positive
  if (x < 0)
    x += m0;

  return x;
}

int main() {
  /*#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
  #endif*/

  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  ll T = 1;
  // cin>>T;
  while (T--) {
    ll n, k, i, j, ans = 0;
    ll a, b;
    cin >> a >> b >> n;
    i = min(b - 1, n);
    ans = max(ans, ((a * i) / b) - (a * (i / b)));
    // cout<<((a*i)/b)-(a*(i/b))<<" ";
    cout << ans;
  }
  return 0;
}