Problem p03497 (C++)

Buggy submission (status: Runtime Error):
// #pragma GCC target ("avx")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
// #define int long long
// #define endl '\n'

#pragma region TEMPLATE

/* TYPE */
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<string> vst;
typedef vector<bool> vb;
typedef vector<ld> vld;
typedef vector<vector<int>> vvi;
template <typename T, typename Cmp = less<>>
using prique = priority_queue<T, vector<T>, Cmp>;
template <typename T> using prique_r = prique<T, greater<>>;
/* CONSTANT */
#define ln '\n'
const int INF = 1 << 30;
const ll INFF = 1LL << 60;
const string ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const int MOD = 1e9 + 7;
const int MODD = 998244353;
const string alphabet = "abcdefghijklmnopqrstuvwxyz";
const double EPS = 1e-9;
const ld PI = 3.14159265358979323846264338327950288;
const int dx[] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
const int dy[] = {0, 1, 0, -1, -1, -1, 1, 1, 0};
/* CONTAINER */
#define PB emplace_back
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define SORT(v) sort(ALL(v))
#define RSORT(v) sort(RALL(v))
#define LESS(x, val) (lower_bound(x.begin(), x.end(), val) - x.begin())
#define LEQ(x, val) (upper_bound(x.begin(), x.end(), val) - x.begin())
#define GREATER(x, val) (int)(x).size() - LEQ((x), (val))
#define GEQ(x, val) (int)(x).size() - LESS((x), (val))
#define UNIQUE(v)                                                              \
  sort(ALL(v));                                                                \
  (v).erase(unique(ALL(v)), (v).end())
template <typename T> vector<T> make_v(size_t a) { return vector<T>(a); }
template <typename T, typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template <typename T, typename U, typename... V>
enable_if_t<is_same<T, U>::value != 0> fill_v(U &u, const V... v) {
  u = U(v...);
}
template <typename T, typename U, typename... V>
enable_if_t<is_same<T, U>::value == 0> fill_v(U &u, const V... v) {
  for (auto &e : u)
    fill_v<T>(e, v...);
}
/* LOOP */
#define _overload3(_1, _2, _3, name, ...) name
#define _REP(i, n) REPI(i, 0, n)
#define REPI(i, a, b) for (ll i = (ll)a; i < (ll)b; ++i)
#define REP(...) _overload3(__VA_ARGS__, REPI, _REP, )(__VA_ARGS__)
#define _RREP(i, n) RREPI(i, n, 0)
#define RREPI(i, a, b) for (ll i = (ll)a; i >= (ll)b; --i)
#define RREP(...) _overload3(__VA_ARGS__, RREPI, _RREP, )(__VA_ARGS__)
#define EACH(e, v) for (auto &e : v)
#define PERM(v)                                                                \
  sort(ALL(v));                                                                \
  for (bool c##p = true; c##p; c##p = next_permutation(ALL(v)))
/* INPUT */
template <typename T> void SSS(T &t) { cin >> t; }
template <typename Head, typename... Tail>
void SSS(Head &&head, Tail &&...tail) {
  cin >> head;
  SSS(tail...);
}
#define SS(T, ...)                                                             \
  T __VA_ARGS__;                                                               \
  SSS(__VA_ARGS__);
#define SV(T, v, n)                                                            \
  vector<T> v(n);                                                              \
  for (auto &i : v)                                                            \
    cin >> i;
#define SVV(T, v, n, m)                                                        \
  vector<vector<T>> v(n, vector<T>(m));                                        \
  for (auto &r : v)                                                            \
    for (auto &i : r)                                                          \
      cin >> i;
/* OUTPUT */
// PROTOTYPE DECLARATION
template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &j);
template <typename... T> ostream &operator<<(ostream &os, const tuple<T...> &t);
template <class C, enable_if_t<!is_same<C, string>::value,
                               decltype(declval<const C &>().begin(),
                                        nullptr)> = nullptr>
ostream &operator<<(ostream &os, const C &c);
template <typename T> ostream &operator<<(ostream &os, const stack<T> &j);
template <typename T> ostream &operator<<(ostream &os, const queue<T> &j);
template <typename T, typename C, typename Cmp>
ostream &operator<<(ostream &os, const priority_queue<T, C, Cmp> &j);
// IMPLEMENTATION
template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &j) {
  return os << '{' << j.first << ", " << j.second << '}';
}
template <size_t num = 0, typename... T>
enable_if_t<num == sizeof...(T)> PRINT_TUPLE(ostream &os,
                                             const tuple<T...> &t) {}
template <size_t num = 0, typename... T>
    enable_if_t <
    num<sizeof...(T)> PRINT_TUPLE(ostream &os, const tuple<T...> &t) {
  os << get<num>(t);
  if (num + 1 < sizeof...(T))
    os << ", ";
  PRINT_TUPLE<num + 1>(os, t);
}
template <typename... T>
ostream &operator<<(ostream &os, const tuple<T...> &t) {
  PRINT_TUPLE(os << '{', t);
  return os << '}';
}
template <class C, enable_if_t<!is_same<C, string>::value,
                               decltype(declval<const C &>().begin(), nullptr)>>
ostream &operator<<(ostream &os, const C &c) {
  os << '{';
  for (auto it = begin(c); it != end(c); it++) {
    if (begin(c) != it)
      os << ", ";
    os << *it;
  }
  return os << '}';
}
template <typename T> ostream &operator<<(ostream &os, const stack<T> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_front(c.top());
  return os << d;
}
template <typename T> ostream &operator<<(ostream &os, const queue<T> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_back(c.front());
  return os << d;
}
template <typename T, typename C, typename Cmp>
ostream &operator<<(ostream &os, const priority_queue<T, C, Cmp> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_front(c.top());
  return os << d;
}
// OUTPUT FUNCTION
template <typename T> int PV(T &v) {
  int sz = v.size();
  for (int i = 0; i < sz; ++i)
    cout << v[i] << " \n"[i == sz - 1];
  return 0;
}
inline int print() {
  cout << endl;
  return 0;
}
template <typename Head> int print(Head &&head) {
  cout << head;
  return print();
}
template <typename Head, typename... Tail>
int print(Head &&head, Tail &&...tail) {
  cout << head << " ";
  return print(forward<Tail>(tail)...);
}
#ifdef LOCAL
inline void dump() { cerr << endl; }
template <typename Head> void dump(Head &&head) {
  cerr << head;
  dump();
}
template <typename Head, typename... Tail>
void dump(Head &&head, Tail &&...tail) {
  cerr << head << ", ";
  dump(forward<Tail>(tail)...);
}
#define debug(...)                                                             \
  do {                                                                         \
    cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = ";                        \
    dump(__VA_ARGS__);                                                         \
  } while (false)
#else
#define dump(...)
#define debug(...)
#endif
/* OTHER */
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define tmax(x, y, z) max((x), max((y), (z)))
#define tmin(x, y, z) min((x), min((y), (z)))
template <typename T, typename A, typename B>
inline bool between(T x, A a, B b) {
  return ((a <= x) && (x < b));
}
template <typename A, typename B> inline bool chmax(A &a, const B &b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <typename A, typename B> inline bool chmin(A &a, const B &b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
inline ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
inline ll POW(ll a, ll b) {
  ll r = 1;
  do {
    if (b & 1)
      r *= a;
    a *= a;
  } while (b >>= 1);
  return r;
}
inline ll MOP(ll a, ll b, const ll &m = MOD) {
  ll r = 1;
  do {
    if (b & 1)
      (r *= a) %= m;
    (a *= a) %= m;
  } while (b >>= 1);
  return r;
}
struct abracadabra {
  abracadabra() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    cerr << fixed << setprecision(5);
  };
} ABRACADABRA;

#pragma endregion

template <typename T> vector<pair<T, int>> groupby(const vector<T> &vec) {
  vector<pair<T, int>> ret;
  int piv = -1;
  for (auto &e : vec) {
    if (piv == -1 or ret[piv].first != e)
      ++piv, ret.emplace_back(make_pair(e, 1));
    else
      ++(ret[piv].second);
  }
  return ret;
}

/*
・ランレングス圧縮
[備考] stringについて用いる場合は, vector<char>に以下のようにして一旦移し替える.
      string str;
      vector<char> vec(str.begin(), str.end());
[使用例]
vector<int> vec = {1, 5, 5, 7, 7, 7, 7};
auto gb = groupby(vec);     // {{1, 1}, {5, 2}, {7, 4}}
[蛇足] 命名はPythonに準拠
*/

signed main() {

  SS(int, N, K);
  SV(int, A, N);
  SORT(A);
  auto gb = groupby(A);
  vi B;
  EACH(e, gb) { B.emplace_back(e.se); }
  RSORT(B);
  ll res = 0;
  EACH(e, B) res += e;
  REP(i, K) res -= B[i];
  print(res);
}


Fixed submission:
// #pragma GCC target ("avx")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#include <bits/stdc++.h>
using namespace std;
// #define int long long
// #define endl '\n'

#pragma region TEMPLATE

/* TYPE */
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<string> vst;
typedef vector<bool> vb;
typedef vector<ld> vld;
typedef vector<vector<int>> vvi;
template <typename T, typename Cmp = less<>>
using prique = priority_queue<T, vector<T>, Cmp>;
template <typename T> using prique_r = prique<T, greater<>>;
/* CONSTANT */
#define ln '\n'
const int INF = 1 << 30;
const ll INFF = 1LL << 60;
const string ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
const int MOD = 1e9 + 7;
const int MODD = 998244353;
const string alphabet = "abcdefghijklmnopqrstuvwxyz";
const double EPS = 1e-9;
const ld PI = 3.14159265358979323846264338327950288;
const int dx[] = {1, 0, -1, 0, 1, -1, -1, 1, 0};
const int dy[] = {0, 1, 0, -1, -1, -1, 1, 1, 0};
/* CONTAINER */
#define PB emplace_back
#define ALL(v) (v).begin(), (v).end()
#define RALL(v) (v).rbegin(), (v).rend()
#define SORT(v) sort(ALL(v))
#define RSORT(v) sort(RALL(v))
#define LESS(x, val) (lower_bound(x.begin(), x.end(), val) - x.begin())
#define LEQ(x, val) (upper_bound(x.begin(), x.end(), val) - x.begin())
#define GREATER(x, val) (int)(x).size() - LEQ((x), (val))
#define GEQ(x, val) (int)(x).size() - LESS((x), (val))
#define UNIQUE(v)                                                              \
  sort(ALL(v));                                                                \
  (v).erase(unique(ALL(v)), (v).end())
template <typename T> vector<T> make_v(size_t a) { return vector<T>(a); }
template <typename T, typename... Ts> auto make_v(size_t a, Ts... ts) {
  return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}
template <typename T, typename U, typename... V>
enable_if_t<is_same<T, U>::value != 0> fill_v(U &u, const V... v) {
  u = U(v...);
}
template <typename T, typename U, typename... V>
enable_if_t<is_same<T, U>::value == 0> fill_v(U &u, const V... v) {
  for (auto &e : u)
    fill_v<T>(e, v...);
}
/* LOOP */
#define _overload3(_1, _2, _3, name, ...) name
#define _REP(i, n) REPI(i, 0, n)
#define REPI(i, a, b) for (ll i = (ll)a; i < (ll)b; ++i)
#define REP(...) _overload3(__VA_ARGS__, REPI, _REP, )(__VA_ARGS__)
#define _RREP(i, n) RREPI(i, n, 0)
#define RREPI(i, a, b) for (ll i = (ll)a; i >= (ll)b; --i)
#define RREP(...) _overload3(__VA_ARGS__, RREPI, _RREP, )(__VA_ARGS__)
#define EACH(e, v) for (auto &e : v)
#define PERM(v)                                                                \
  sort(ALL(v));                                                                \
  for (bool c##p = true; c##p; c##p = next_permutation(ALL(v)))
/* INPUT */
template <typename T> void SSS(T &t) { cin >> t; }
template <typename Head, typename... Tail>
void SSS(Head &&head, Tail &&...tail) {
  cin >> head;
  SSS(tail...);
}
#define SS(T, ...)                                                             \
  T __VA_ARGS__;                                                               \
  SSS(__VA_ARGS__);
#define SV(T, v, n)                                                            \
  vector<T> v(n);                                                              \
  for (auto &i : v)                                                            \
    cin >> i;
#define SVV(T, v, n, m)                                                        \
  vector<vector<T>> v(n, vector<T>(m));                                        \
  for (auto &r : v)                                                            \
    for (auto &i : r)                                                          \
      cin >> i;
/* OUTPUT */
// PROTOTYPE DECLARATION
template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &j);
template <typename... T> ostream &operator<<(ostream &os, const tuple<T...> &t);
template <class C, enable_if_t<!is_same<C, string>::value,
                               decltype(declval<const C &>().begin(),
                                        nullptr)> = nullptr>
ostream &operator<<(ostream &os, const C &c);
template <typename T> ostream &operator<<(ostream &os, const stack<T> &j);
template <typename T> ostream &operator<<(ostream &os, const queue<T> &j);
template <typename T, typename C, typename Cmp>
ostream &operator<<(ostream &os, const priority_queue<T, C, Cmp> &j);
// IMPLEMENTATION
template <typename T, typename U>
ostream &operator<<(ostream &os, const pair<T, U> &j) {
  return os << '{' << j.first << ", " << j.second << '}';
}
template <size_t num = 0, typename... T>
enable_if_t<num == sizeof...(T)> PRINT_TUPLE(ostream &os,
                                             const tuple<T...> &t) {}
template <size_t num = 0, typename... T>
    enable_if_t <
    num<sizeof...(T)> PRINT_TUPLE(ostream &os, const tuple<T...> &t) {
  os << get<num>(t);
  if (num + 1 < sizeof...(T))
    os << ", ";
  PRINT_TUPLE<num + 1>(os, t);
}
template <typename... T>
ostream &operator<<(ostream &os, const tuple<T...> &t) {
  PRINT_TUPLE(os << '{', t);
  return os << '}';
}
template <class C, enable_if_t<!is_same<C, string>::value,
                               decltype(declval<const C &>().begin(), nullptr)>>
ostream &operator<<(ostream &os, const C &c) {
  os << '{';
  for (auto it = begin(c); it != end(c); it++) {
    if (begin(c) != it)
      os << ", ";
    os << *it;
  }
  return os << '}';
}
template <typename T> ostream &operator<<(ostream &os, const stack<T> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_front(c.top());
  return os << d;
}
template <typename T> ostream &operator<<(ostream &os, const queue<T> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_back(c.front());
  return os << d;
}
template <typename T, typename C, typename Cmp>
ostream &operator<<(ostream &os, const priority_queue<T, C, Cmp> &j) {
  deque<T> d;
  for (auto c = j; !c.empty(); c.pop())
    d.push_front(c.top());
  return os << d;
}
// OUTPUT FUNCTION
template <typename T> int PV(T &v) {
  int sz = v.size();
  for (int i = 0; i < sz; ++i)
    cout << v[i] << " \n"[i == sz - 1];
  return 0;
}
inline int print() {
  cout << endl;
  return 0;
}
template <typename Head> int print(Head &&head) {
  cout << head;
  return print();
}
template <typename Head, typename... Tail>
int print(Head &&head, Tail &&...tail) {
  cout << head << " ";
  return print(forward<Tail>(tail)...);
}
#ifdef LOCAL
inline void dump() { cerr << endl; }
template <typename Head> void dump(Head &&head) {
  cerr << head;
  dump();
}
template <typename Head, typename... Tail>
void dump(Head &&head, Tail &&...tail) {
  cerr << head << ", ";
  dump(forward<Tail>(tail)...);
}
#define debug(...)                                                             \
  do {                                                                         \
    cerr << __LINE__ << ":\t" << #__VA_ARGS__ << " = ";                        \
    dump(__VA_ARGS__);                                                         \
  } while (false)
#else
#define dump(...)
#define debug(...)
#endif
/* OTHER */
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define tmax(x, y, z) max((x), max((y), (z)))
#define tmin(x, y, z) min((x), min((y), (z)))
template <typename T, typename A, typename B>
inline bool between(T x, A a, B b) {
  return ((a <= x) && (x < b));
}
template <typename A, typename B> inline bool chmax(A &a, const B &b) {
  if (a < b) {
    a = b;
    return true;
  }
  return false;
}
template <typename A, typename B> inline bool chmin(A &a, const B &b) {
  if (a > b) {
    a = b;
    return true;
  }
  return false;
}
inline ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b) * b; }
inline ll POW(ll a, ll b) {
  ll r = 1;
  do {
    if (b & 1)
      r *= a;
    a *= a;
  } while (b >>= 1);
  return r;
}
inline ll MOP(ll a, ll b, const ll &m = MOD) {
  ll r = 1;
  do {
    if (b & 1)
      (r *= a) %= m;
    (a *= a) %= m;
  } while (b >>= 1);
  return r;
}
struct abracadabra {
  abracadabra() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(20);
    cerr << fixed << setprecision(5);
  };
} ABRACADABRA;

#pragma endregion

template <typename T> vector<pair<T, int>> groupby(const vector<T> &vec) {
  vector<pair<T, int>> ret;
  int piv = -1;
  for (auto &e : vec) {
    if (piv == -1 or ret[piv].first != e)
      ++piv, ret.emplace_back(make_pair(e, 1));
    else
      ++(ret[piv].second);
  }
  return ret;
}

/*
・ランレングス圧縮
[備考] stringについて用いる場合は, vector<char>に以下のようにして一旦移し替える.
      string str;
      vector<char> vec(str.begin(), str.end());
[使用例]
vector<int> vec = {1, 5, 5, 7, 7, 7, 7};
auto gb = groupby(vec);     // {{1, 1}, {5, 2}, {7, 4}}
[蛇足] 命名はPythonに準拠
*/

signed main() {

  SS(int, N, K);
  SV(int, A, N);
  SORT(A);
  auto gb = groupby(A);
  if (gb.size() <= K)
    return print(0);
  vi B;
  EACH(e, gb) { B.emplace_back(e.se); }
  RSORT(B);
  ll res = 0;
  EACH(e, B) res += e;
  REP(i, K) res -= B[i];
  print(res);
}