Submission #870842

#	Time	Username	Problem	Language	Result	Execution time	Memory
870842		marvinthang	Fun Tour (APIO20_fun)	C++17	100 / 100	183 ms	21704 KiB

fun

/*************************************
*    author: marvinthang             *
*    created: 09.11.2023 14:50:12    *
*************************************/

#include "fun.h"
#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-- > 0; )
#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

vector <int> createFunTour(int n, int q) {
	int min_sz = n, cen = 0;
	FOR(u, 1, n) {
		int sz_u = attractionsBehind(0, u);
		if (sz_u > n / 2 && sz_u < min_sz) min_sz = sz_u, cen = u;
	}
	vector <int> dist(n), child;
	REP(i, n) if (i != cen) {
		dist[i] = hoursRequired(cen, i);
		if (dist[i] == 1) child.push_back(i);
	}
	vector <int> comps(n, child.size() - 1);
	REP(i, child.size() - 1) {
		comps[child[i]] = i;
		REP(u, n) if (u != cen && comps[u] == child.size() - 1 && hoursRequired(u, child[i]) + 1 == dist[u]) comps[u] = i;
	}
	vector <int> sz(3);
	REP(i, n) if (i != cen) ++sz[comps[i]];
	int mi = min_element(ALL(sz)) - sz.begin();
	comps[cen] = mi;
	++sz[mi];
	vector <vector <int>> List(3);
	REP(i, n) List[comps[i]].push_back(i);
	REP(i, 3) sort(ALL(List[i]), [&] (int u, int v) { return dist[u] < dist[v]; });
	int last = -1;
	vector <int> res;
	FORDE(sum, n, 1) {
		bool ok = false;
		REP(i, 3) if (sz[i] + sz[i] == sum) {
			vector <int> new_list;
			int f = 1;
			if (last >= 0 && last != i) {
				int k = 3 - i - last;
				if (dist[List[last].back()] >= dist[List[3 - i - last].back()]) f = 0;
			}
			REP(j, 3) if (j != i) new_list.insert(new_list.end(), ALL(List[j]));
			sort(ALL(new_list), [&] (int u, int v) { return dist[u] < dist[v]; });
			REPD(t, sz[i]) {
				if (f) {
					res.push_back(new_list[t]);
					res.push_back(List[i][t]);
				} else {
					res.push_back(List[i][t]);
					res.push_back(new_list[t]);
				}
			}
			ok = true;
			break;
		}
		if (ok) break;
		int ma = -1;
		REP(i, 3) if (i != last && !List[i].empty() && (ma < 0 || dist[List[ma].back()] < dist[List[i].back()])) ma = i;
		res.push_back(List[ma].back());
		List[ma].pop_back();
		last = ma;
		--sz[ma];
	}
	return res;
}

Compilation message (stderr)

fun.cpp: In function 'std::vector<int> createFunTour(int, int)':
fun.cpp:60:38: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |   REP(u, n) if (u != cen && comps[u] == child.size() - 1 && hoursRequired(u, child[i]) + 1 == dist[u]) comps[u] = i;
fun.cpp:78:9: warning: unused variable 'k' [-Wunused-variable]
   78 |     int k = 3 - i - last;
      |         ^

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 21 / 21
• Subtask 4: 19 / 19
• Subtask 5: 34 / 34