Submission #910240

#	Time	Username	Problem	Language	Result	Execution time	Memory
910240		marvinthang	Closing Time (IOI23_closing)	C++17	83 / 100	1089 ms	2097152 KiB

closing

/*************************************
*    author: marvinthang             *
*    created: 18.01.2024 09:24:21    *
*************************************/

#include "closing.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-- > 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

int max_score(int N, int X, int Y, long long K, vector <int> U, vector <int> V, vector <int> W) {
    vector <long long> dx(N), dy(N);
    vector <int> par(N);
    vector <vector <pair <int, int>>> adj(N);
    REP(i, N - 1) {
        adj[U[i]].emplace_back(W[i], V[i]);
        adj[V[i]].emplace_back(W[i], U[i]);
    } 
    function<void(int, vector <long long> &)> dfs = [&] (int u, vector <long long> &dist) {
        for (auto [w, v]: adj[u]) if (v != par[u]) {
            par[v] = u;
            dist[v] = dist[u] + w;
            dfs(v, dist);
        }
    };
    par[X] = -1; dfs(X, dx);
    par[Y] = -1; dfs(Y, dy);

    vector <long long> values(ALL(dx));
    values.insert(values.end(), ALL(dy));
    sort(ALL(values));
    int res = 0;
    long long cur = K;
    for (long long c: values) {
        cur -= c;
        if (cur < 0) break;
        ++res;
    }

    if (dx[Y] > K + K) return res;

    vector <bool> on_path(N);
    for (; X != Y; X = par[X]) on_path[X] = true;
    on_path[X] = true;

    vector dp(N + 1, vector(N + N + 1, K + 1));
    dp[0][0] = 0;
    REP(i, N) REP(j, i + i + 1) if (dp[i][j] <= K) {
        minimize(dp[i + 1][j + 1], dp[i][j] + min(dx[i], dy[i]));
        minimize(dp[i + 1][j + 2], dp[i][j] + max(dx[i], dy[i]));
        if (!on_path[i]) minimize(dp[i + 1][j], dp[i][j]);
    }
    REPD(j, N + N + 1) if (dp[N][j] <= K) {
        maximize(res, j);
        break;
    }
    return res;
}

• Subtask 0: 0 / 0
• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 12 / 12
• Subtask 4: 14 / 14
• Subtask 5: 9 / 9
• Subtask 6: 11 / 11
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 0 / 17