Submission #706182

#	Time	Username	Problem	Language	Result	Execution time	Memory
706182		marvinthang	Boxes with souvenirs (IOI15_boxes)	C++17	100 / 100	484 ms	196048 KiB

boxes

/*************************************
*    author: marvinthang             *
*    created: 06.03.2023 10:42:04    *
*************************************/

#include "boxes.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--; )
#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 T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> scan_op(pair <U, V>)  { return in >> u.fi >> u.se; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
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 << '}'; }
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 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;

long long delivery(int N, int K, int L, int p[]) {
    long long res = INF;
    vector <long long> pref(N + 1), suff(N + 1);
    REP(s, N) {
        pref[s + 1] = (s < K ? 0 : pref[s + 1 - K]) + p[s] * 2;
        suff[s + 1] = (s < K ? 0 : suff[s + 1 - K]) + (L - p[N - s - 1]) * 2;
    }
    int m = N / K;
    REP(s, N + 1) {
        int l = 1, r = (N - s) / K;
        auto cost = [&] (int m) {
            return 1LL * m * L + pref[s] + suff[N - s - m * K];
        };
        m = min(m, (N - s) / K);
        while (m > 0 && cost(m) > cost(m - 1)) --m;
        minimize(res, cost(m));
    }
    return res;
}

Compilation message (stderr)

boxes.cpp: In lambda function:
boxes.cpp:60:30: warning: declaration of 'm' shadows a previous local [-Wshadow]
   60 |         auto cost = [&] (int m) {
      |                          ~~~~^
boxes.cpp:57:9: note: shadowed declaration is here
   57 |     int m = N / K;
      |         ^
boxes.cpp: In function 'long long int delivery(int, int, int, int*)':
boxes.cpp:59:13: warning: unused variable 'l' [-Wunused-variable]
   59 |         int l = 1, r = (N - s) / K;
      |             ^
boxes.cpp:59:20: warning: unused variable 'r' [-Wunused-variable]
   59 |         int l = 1, r = (N - s) / K;
      |                    ^

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 15 / 15
• Subtask 5: 20 / 20
• Subtask 6: 30 / 30