Submission #911643

#	Time	Username	Problem	Language	Result	Execution time	Memory
911643		marvinthang	Overtaking (IOI23_overtaking)	C++17	100 / 100	1084 ms	94572 KiB

overtaking

/*************************************
*    author: marvinthang             *
*    created: 19.01.2024 10:11:16    *
*************************************/

#include "overtaking.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 n;
vector <long long> cx, st;
long long add;

void init(int L, int N, vector <long long> T, vector <int> W, int X, int M, vector <int> S) {
    add = 1LL * X * L;
    vector <pair <long long, int>> buses;
    REP(i, N) buses.emplace_back(T[i], W[i]);
    vector <vector <pair <long long, long long>>> lines(M - 1);
    REP(t, M - 1) {
        sort(ALL(buses));
        int dist = S[t + 1] - S[t];
        REP(i, N) {
            long long nxt = buses[i].fi + 1LL * buses[i].se * dist;
            if (i && nxt <= buses[i - 1].fi) nxt = buses[i - 1].fi;
            else {
                long long tl = buses[i].fi - 1LL * X * S[t] + 1;
                long long tr = nxt - 1LL * X * S[t + 1];
                if (tl >= 0 && tl < tr) {
                    lines[t].emplace_back(tl, tr);
                    cx.push_back(tl);
                    cx.push_back(tr);
                }
            }
            buses[i].fi = nxt;
        }
    }
    sort(ALL(cx));
    cx.erase(unique(ALL(cx)), cx.end());
    n = cx.size();
    st.resize(2 * n);
    REP(i, n) st[i + n] = cx[i];
    REPD(t, M - 1) {
        for (auto &[l, r]: lines[t]) {
            int tl = lower_bound(ALL(cx), l) - cx.begin();
            int tr = lower_bound(ALL(cx), r) - cx.begin();
            if (tl < tr) {
                long long val = 0;
                for (int i = tr + n; i; i >>= 1) maximize(val, st[i]);
                for (tl += n, tr += n; tl < tr; tl >>= 1, tr >>= 1) {
                    if (tl & 1) maximize(st[tl++], val);
                    if (tr & 1) maximize(st[--tr], val);
                }
            }
        }
    }
    FOR(i, 1, n) if (st[i]) {
        maximize(st[i << 1], st[i]);
        maximize(st[i << 1 | 1], st[i]);
    }
}

long long arrival_time(long long Y) {
    if (cx.empty() || Y < cx[0]) return Y + add;
    return add + max(Y, st[upper_bound(ALL(cx), Y) - cx.begin() - 1 + n]);
    return 0;
}

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 26 / 26
• Subtask 5: 35 / 35