Submission #801861

#	Time	Username	Problem	Language	Result	Execution time	Memory
801861		marvinthang	Travelling Merchant (CCO21_day2problem1)	C++17	25 / 25	230 ms	31612 KiB

Main

/*************************************
*    author: marvinthang             *
*    created: 02.08.2023 14:55:13    *
*************************************/

#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 << '}'; }

struct Edge {
	int u, v, r, p;
	Edge(int u = 0, int v = 0, int r = 0, int p = 0): u(u), v(v), r(r), p(p) {}
};

// end of template

const int MAX = 2e5 + 5;

int N, M;
Edge edges[MAX];
vector <int> adj[MAX], r_adj[MAX];

void init(void) {
	cin >> N >> M;
	REP(i, M) {
		int u, v, r, p; cin >> u >> v >> r >> p;
		edges[i] = Edge(u, v, r, p);
		adj[u].push_back(i);
		r_adj[v].push_back(i);
	}
}

int deg[MAX], res[MAX];
bool used[MAX];

void process(void) {
	queue <int> q;
	FORE(i, 1, N) {
		deg[i] = adj[i].size();
		if (!deg[i]) q.push(i);		
	}
	while (!q.empty()) {
		int u = q.front(); q.pop();
		res[u] = -1;
		for (int id: r_adj[u]) {
			int v = edges[id].u;
			used[id] = true;
			if (!--deg[v]) q.push(v);
		}
	}
	priority_queue <pair <int, int>> pq;
	REP(i, M) if (!used[i]) pq.emplace(edges[i].r, i);
	while (!pq.empty()) {
		auto [ru, i] = pq.top(); pq.pop();
		if (used[i]) continue;
		used[i] = true;
		int u = edges[i].u;
		if (!--deg[u]) {
			res[u] = ru;
			for (int i: r_adj[u]) if (!used[i] && edges[i].r < ru - edges[i].p) pq.emplace(ru - edges[i].p, i);
		}
	}
	FORE(i, 1, N) cout << res[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)

Main.cpp: In function 'int main()':
Main.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); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:101:2: note: in expansion of macro 'file'
  101 |  file("A");
      |  ^~~~
Main.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); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:101:2: note: in expansion of macro 'file'
  101 |  file("A");
      |  ^~~~

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 16 / 16