Submission #736112

#	Time	Username	Problem	Language	Result	Execution time	Memory
736112		marvinthang	Swap (BOI16_swap)	C++17	100 / 100	822 ms	3640 KiB

swap

/*************************************
*    author: marvinthang             *
*    created: 05.05.2023 08:42:59    *
*************************************/

#include <bits/stdc++.h>

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i--; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class U, class V> scan_op(pair <U, V>)  { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }

// end of template

const int MAX = 2e5 + 5;

int N, P[MAX];

void init(void) {
	cin >> N;
	FORE(i, 1, N) cin >> P[i];
}

int get_pos(int i, int a) {
	if (i * 2 > N) return i;
	int b = P[i * 2], c = i * 2 == N ? N + 1 : P[i * 2 + 1];
	if (a < min(b, c)) return i;
	if (b < c) return get_pos(i * 2, a);
	if (a < b) return min(get_pos(i * 2, a), get_pos(i * 2 + 1, a));
	return get_pos(i * 2, b) > get_pos(i * 2 + 1, b) ? get_pos(i * 2, a) : get_pos(i * 2 + 1, a);
}

void process(void) {
	FORE(i, 1, N / 2) {
		int a = P[i], b = P[i * 2], c = i * 2 == N ? N + 1 : P[i * 2 + 1];
		if (a < min(b, c)) continue;
		if (b < c) {
			swap(P[i], P[i * 2]);
			continue;
		}
		P[i] = c;
		if (a > b) swap(a, b);
		if (get_pos(i * 2, a) > get_pos(i * 2 + 1, a)) swap(a, b);
		P[i * 2] = a; P[i * 2 + 1] = b;
	}
	FORE(i, 1, N) cout << P[i] << ' ';
}

int main(void) {
	ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
	file("A");
	init();
	process();
	cerr << "Time elapsed: " << TIME << " s.\n";
	return (0^0);
}

Compilation message (stderr)

swap.cpp: In function 'int main()':
swap.cpp:30:61: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
swap.cpp:81:2: note: in expansion of macro 'file'
   81 |  file("A");
      |  ^~~~
swap.cpp:30:94: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |     #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
swap.cpp:81:2: note: in expansion of macro 'file'
   81 |  file("A");
      |  ^~~~

• Subtask 1: 10 / 10
• Subtask 2: 11 / 11
• Subtask 3: 27 / 27
• Subtask 4: 20 / 20
• Subtask 5: 32 / 32