Submission #884697

#	Time	Username	Problem	Language	Result	Execution time	Memory
884697		thieunguyenhuy	Holiday (IOI14_holiday)	C++17	0 / 100	5101 ms	2260 KiB

holiday

#include "holiday.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>

using namespace __gnu_pbds;
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
typedef pair<long long, int> pli;
typedef pair<int, long long> pil;
typedef vector<pair<int, int>> vii;
typedef vector<pair<long long, long long>> vll;
typedef vector<pair<long long, int>> vli;
typedef vector<pair<int, long long>> vil;

#define bitcnt(n) __builtin_popcountll((n))
#define BIT(n, i) (((n) >> (i)) & 1ll)
#define FLIP(n, i) ((n) ^ (1ll << (i)))
#define MASK(i) (1ll << (i))
#define ON(n, i) ((n) | MASK(i))
#define OFF(n, i) ((n) & ~MASK(i))

#define Int __int128
#define gcd(a, b) __gcd(a, b)
#define lcm(a, b) a / gcd(a, b) * b
#define fi first
#define se second

template <class T>
using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;

template <class T1, class T2> 
bool maximize(T1 &x, T2 y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <class T1, class T2>
bool minimize(T1 &x, T2 y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}

const int N = 1e6 + 5;
const int MOD = 1e9 + 7;
const int inf = 1e9;
const ll INF = 1e18;

int n, st, d;
int a[N];
ll ans = 0;
vector<int> cmp;

int get_cmp(int x) {
    return lower_bound(cmp.begin(), cmp.end(), x) - cmp.begin();
}

struct SegmentTree {
    vli node;
    int n;

    SegmentTree() {}

    void resize(int _n) {
        n = _n; node.assign(4 * n + 5, make_pair(0, 0));
    }

    pli merge(const pli A, const pli B) {
        return make_pair(A.fi + B.fi, A.se + B.se);
    }

    void update(int id, int l, int r, int p, int val) {
        if (l > p || r < p) return;
        if (l == r) {
            node[id] = merge(node[id], make_pair(1ll * cmp[l] * val, val));
            return;
        }
        int mid = l + r >> 1;
        update(id << 1, l, mid, p, val);
        update(id << 1 | 1, mid + 1, r, p, val);
        node[id] = merge(node[id << 1], node[id << 1 | 1]);
    }

    void update(int p, int val) {
        update(1, 0, n, p, val);
    }

    pli walk(int id, int l, int r, int can_get) {
        if (can_get <= 0) return make_pair(0, 0);
        if (can_get >= node[id].se) return node[id];
        if (l == r) return make_pair(1ll * cmp[l] * can_get, can_get);
        int mid = l + r >> 1;
        pli ri = walk(id << 1 | 1, mid + 1, r, can_get);
        pli le = walk(id << 1, l, mid, can_get - ri.se);
        return merge(le, ri);
    }

    pli walk(int can_get) {
        return walk(1, 0, n, can_get);
    }
} seg;

int min_dist(int x, int y) /*min dist to move from st to (x or y) to (y or x)*/ {
    // cout << x << ' ' << y << ' ' << abs(x - y) + min(abs(x - st), abs(y - st)) << '\n';
    // return abs(x - y) + min(abs(x - st), abs(y - st));
    if (x >= st) return y - st;
    if (y <= st) return st - x;
    return y - x + min(y - st, st - x);
}

ll max_attraction(int can_get) /*chọn tối đa can_get vị trí i trong đoạn [l, r] có tổng lớn nhất*/ {
    return seg.walk(can_get).fi;
}

void solve(int l, int r, int optL, int optR) {
    if (l > r) return;
    int mid = l + r >> 1;
    pli best(-INF, -1);
    for (int i = optL; i <= mid; ++i)
        seg.update(get_cmp(a[i]), 1);
    for (int i = optL; i <= min(mid, optR); ++i) {
        maximize(best, make_pair(max_attraction(d - min_dist(i, mid)), i));
        seg.update(get_cmp(a[i]), -1);
    }
    for (int i = min(mid, optR) + 1; i <= mid; ++i)
        seg.update(get_cmp(a[i]), -1);
    maximize(ans, best.fi);
    solve(l, mid - 1, optL, best.se);
    solve(mid + 1, r, best.se, optR);
}

ll findMaxAttraction(int _n, int _st, int _d, int a[]) {
    n = _n, st = _st, d = _d;
    for (int i = 0; i < n; ++i) cmp.emplace_back(a[i]);
    sort (cmp.begin(), cmp.end());
    cmp.resize(unique(cmp.begin(), cmp.end()) - cmp.begin());

    seg.resize(cmp.size() + 5); solve(0, n - 1, 0, n - 1);
    return ans;
}

Compilation message (stderr)

holiday.cpp: In member function 'void SegmentTree::update(int, int, int, int, int)':
holiday.cpp:87:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   87 |         int mid = l + r >> 1;
      |                   ~~^~~
holiday.cpp: In member function 'pli SegmentTree::walk(int, int, int, int)':
holiday.cpp:101:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  101 |         int mid = l + r >> 1;
      |                   ~~^~~
holiday.cpp: In function 'void solve(int, int, int, int)':
holiday.cpp:126:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  126 |     int mid = l + r >> 1;
      |               ~~^~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 23
• Subtask 3: 0 / 17
• Subtask 4: 0 / 53