Submission #876725

#TimeUsernameProblemLanguageResultExecution timeMemory
876725marvinthangTravelling Merchant (APIO17_merchant)C++17
100 / 100
148 ms3616 KiB
/************************************* * author: marvinthang * * created: 22.11.2023 15:37:37 * *************************************/ #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 << '}'; } // copied from https://codeforces.com/blog/entry/76149 template<int D, typename T> struct Vec: public vector <Vec <D - 1, T>> { static_assert(D >= 1, "Vector dimension must be greater than zero!"); template <typename... Args> Vec(int n = 0, Args... args): vector <Vec <D - 1, T>>(n, Vec <D - 1, T>(args...)) {} }; template<typename T> struct Vec <1, T>: public vector <T> { Vec(int n = 0, const T& val = T()): vector <T>(n, val) {} }; template <class A, class B> bool minimize(A &a, B b) { if (a > b) { a = b; return true; } return false; } template <class A, class B> bool maximize(A &a, B b) { if (a < b) { a = b; return true; } return false; } // end of template const long long INF = 1e18; void process(void) { int n, m, k; cin >> n >> m >> k; Vec <2, int> B(n, k), S(n, k), max_add(n, n); REP(i, n) REP(j, k) cin >> B[i][j] >> S[i][j]; REP(i, n) REP(j, n) REP(t, k) if (S[j][t] >= 0 && B[i][t] >= 0) maximize(max_add[i][j], S[j][t] - B[i][t]); Vec <2, long long> dist(n, n, INF), tdist(n, n); while (m--) { int u, v, w; cin >> u >> v >> w; dist[u - 1][v - 1] = w; } REP(k, n) REP(i, n) REP(j, n) minimize(dist[i][j], dist[i][k] + dist[k][j]); long long l = 1, r = INF; auto check = [&] (long long val) { long long v = INF / val; REP(i, n) REP(j, n) tdist[i][j] = max_add[i][j] - (v < dist[i][j] ? INF : dist[i][j] * val); REP(k, n) REP(i, n) REP(j, n) maximize(tdist[i][j], tdist[i][k] + tdist[k][j]); REP(i, n) if (tdist[i][i] >= 0) return true; return false; }; while (l <= r) { long long m = (l + r) >> 1; if (check(m)) l = m + 1; else r = m - 1; } cout << r << '\n'; } int main(void) { ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr); file("merchant"); // int t; cin >> t; while (t--) process(); // cerr << "Time elapsed: " << TIME << " s.\n"; return (0^0); }

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.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); }
      |                                                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:89:2: note: in expansion of macro 'file'
   89 |  file("merchant");
      |  ^~~~
merchant.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); }
      |                                                                                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:89:2: note: in expansion of macro 'file'
   89 |  file("merchant");
      |  ^~~~
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