제출 #482827

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
482827		jalsol	쌀 창고 (IOI11_ricehub)	C++17	68 / 100	14 ms	2892 KiB

ricehub

#ifdef LOCAL
#include "local.h"
#else
#include <bits/stdc++.h>
#define debug(...)
#define DB(...)
#endif

using namespace std;

const bool __initialization = []() {
    cin.tie(nullptr)->sync_with_stdio(false);
    cout << setprecision(12) << fixed;
    return true;
}();

using ll = long long;
using ld = long double;

#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()

#define For(i, l, r) for (int i = (l); i <= (r); ++i)
#define Ford(i, r, l) for (int i = (r); i >= (l); --i)
#define Rep(i, n) For (i, 0, (n) - 1)
#define Repd(i, n) Ford (i, (n) - 1, 0)
#define Fe(...) for (auto __VA_ARGS__)

template <class C> inline int isz(const C& c) { return static_cast<int>(c.size()); }
template <class T> inline bool chmin(T& a, const T& b) { return (a > b) ? a = b, true : false; }
template <class T> inline bool chmax(T& a, const T& b) { return (a < b) ? a = b, true : false; }

constexpr ld eps = 1e-9;
constexpr int inf = 1e9;
constexpr ll linf = 1e18;

// =============================================================================

constexpr int maxn = 1e5 + 5;

#include "ricehub.h"

int n, len;
ll budget;
int a[maxn];
ll pref[maxn];

int check(int L, int R) {
    int M = (L + R) / 2;

    ll left = 1LL * a[M] * (M - L) - (pref[M - 1] - pref[L - 1]);
    ll right = (pref[R] - pref[M]) - 1LL * a[M] * (R - M);

    return left + right;
}

int besthub(int _R, int _L, int _X[], ll _B) {
// globalization
    n = _R; len = _L; budget = _B;
    For (i, 1, n) a[i] = _X[i - 1];
// end of globalization

    For (i, 1, n) {
        pref[i] = pref[i - 1] + a[i];
    }

    int ans = 0;
    int R = 1;

    For (L, 1, n) {
        while (R < n && check(L, R + 1) <= budget) {
            ++R;
        }

        chmax(ans, R - L + 1);
    }

    assert(ans != -1);
    return ans;
}
// wait this could still get TLE...
// and I'm not even sure if this will be correct...
// iirc this IOI was offline

// bro wtf lmaooooooo
// it worked
// but many people in the actual contest got this correct as well...

// maybe sliding window?

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 0 / 32