Submission #1091636

#	Time	Username	Problem	Language	Result	Execution time	Memory
1091636		marvinthang	Ski 2 (JOI24_ski2)	C++17	100 / 100	186 ms	2128 KiB

Main

/*************************************
*    author: marvinthang             *
*    created: 21.03.2024 17:10:36    *
*************************************/

#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 << '}'; }
template <class A, class B> bool minimize(A &a, B b)  { return a > b ? a = b, true : false; }
template <class A, class B> bool maximize(A &a, B b)  { return a < b ? a = b, true : false; }

// end of template

const int MAX_H = 2e9 + 7;
const long long INF = 1e18;

void process(void) {
    int N, K; cin >> N >> K;
    vector <pair <int, int>> points(N); cin >> points;
    if (N == 1) return void(cout << "0\n");
    sort(ALL(points));
    long long add = 0;
    FOR(i, 1, N) {
        if (points[i].fi == points[0].fi) {
            ++points[i].fi;
            add += K;
        }
    }
    sort(ALL(points), [&] (pair <int, int> x, pair <int, int> y) { return pair{x.fi, y.se} < pair{y.fi, x.se}; });
    points.emplace_back(MAX_H - 2, 0);
    ++N;
    int last = 0;
    vector dp(N, vector<long long>(N, INF));
    dp[1][0] = 0;
    map <int, int> cnt;
    vector <long long> min_pref(N, INF);
    FOR(p, 1, N) if ((p == N - 1 || points[p].fi != points[p + 1].fi) && points[p].se < points[last].se) {
        vector nxt_dp(N, vector<long long>(N, INF));
        REP(f, max(last + 1, 2)) {
            FORE(c, 1, max(p, 1)) min_pref[c] = min(min_pref[c - 1], dp[c][f] - 1LL * c * points[last].se);
            cnt.clear();
            FORE(i, last + 1, p) cnt[points[i].fi]++;
            cnt[points[last].fi + 1] += f;
            long long cur = 0;
            FORDE(c, max(p, 1), 1) {
                for (auto &[h, x]: cnt) {
                	if (h > points[p].fi) break;
                    if (x > c) {
                        cnt[h + 1] += x - c;
                        cur += 1LL * (x - c) * K;
                        x = c;
                    }
                }
                minimize(nxt_dp[c][cnt[points[p].fi + 1]], 1LL * c * points[last].se + cur + min_pref[c]);
            }
        }
        last = p;
        dp.swap(nxt_dp);
    }
    long long res = INF;
    REP(i, N) REP(j, N) minimize(res, dp[i][j]);
    cout << res + add << '\n';
}

int main(void) {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); // cout.tie(nullptr);
    file("ski2");
    // int t; cin >> t; while (t--)
    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:100:5: note: in expansion of macro 'file'
  100 |     file("ski2");
      |     ^~~~
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:100:5: note: in expansion of macro 'file'
  100 |     file("ski2");
      |     ^~~~

• Subtask 1: 5 / 5
• Subtask 2: 12 / 12
• Subtask 3: 9 / 9
• Subtask 4: 33 / 33
• Subtask 5: 27 / 27
• Subtask 6: 14 / 14