Submission #947122

#	Time	Username	Problem	Language	Result	Execution time	Memory
947122		marvinthang	Fireworks (APIO16_fireworks)	C++17	100 / 100	138 ms	43920 KiB

fireworks

/*************************************
*    author: marvinthang             *
*    created: 15.03.2024 20:26:27    *
*************************************/

#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

void process(void) {
	int n, m; cin >> n >> m;
	vector <int> par(n + m), lengths(n + m);
	FOR(i, 1, n + m) {
		cin >> par[i] >> lengths[i];
		--par[i];
	}
	vector <int> slope(n + m);
	vector <long long> dp(n + m);
	vector <priority_queue <long long>> pq(n + m);
	REPD(i, n + m) {
		if (i >= n) {
			slope[i] = 1;
			pq[i].push(lengths[i]);
			pq[i].push(lengths[i]);
		} else {
			while (slope[i] > 1) {
				long long cur = pq[i].top(); pq[i].pop();
				dp[i] -= --slope[i] * (cur - pq[i].top());
			}
			long long x = pq[i].top() + lengths[i]; pq[i].pop();
			long long y = pq[i].top() + lengths[i]; pq[i].pop();
			pq[i].push(x);
			pq[i].push(y);
		}
		if (!i) return void(cout << dp[i] << '\n');
		if (pq[par[i]].size() < pq[i].size()) {
			pq[par[i]].swap(pq[i]);
			swap(slope[par[i]], slope[i]);
			swap(dp[par[i]], dp[i]);
		}
		if (pq[i].empty()) continue;
		dp[par[i]] += dp[i] + (pq[par[i]].top() > pq[i].top() ? slope[i] * (pq[par[i]].top() - pq[i].top()) : slope[par[i]] * (pq[i].top() - pq[par[i]].top()));
		slope[par[i]] += slope[i];
		while (!pq[i].empty()) {
			pq[par[i]].push(pq[i].top());
			pq[i].pop();
		}
	}
}

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

Compilation message (stderr)

fireworks.cpp: In function 'int main()':
fireworks.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); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fireworks.cpp:88:2: note: in expansion of macro 'file'
   88 |  file("fireworks");
      |  ^~~~
fireworks.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); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
fireworks.cpp:88:2: note: in expansion of macro 'file'
   88 |  file("fireworks");
      |  ^~~~

• Subtask 1: 7 / 7
• Subtask 2: 19 / 19
• Subtask 3: 29 / 29
• Subtask 4: 45 / 45