제출 #537887

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
537887		MrKustic	Bulldozer (JOI17_bulldozer)	C++98	25 / 100	2085 ms	188152 KiB

bulldozer

#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define pb emplace_back
#define x first
#define y second

using namespace std;
//using namespace __gnu_pbds;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pt;
typedef pair<ll, ll> ptll;
//typedef tree<int, null_type, less<>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
//typedef gp_hash_table<int, int> table;

void fastio(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
}


//#pragma GCC optimize("Ofast")


//-------------------------------------------

struct Point {
    ll x, y, w;
    int id;

    bool top() const{
        return (y > 0) || (y == 0 && x >= 0);
    };

    ll distq(Point other = {0, 0}) const{
        return (other.x - x) * (other.x - x) + (other.y - y) * (other.y - y);
    }

    ld dist(Point other = {0, 0}) const{
        return sqrt(distq(other));
    }

    void rev(){
        x = -x, y = -y;
    }

    ll operator % (Point other) const{
        return x * other.y - y * other.x;
    }

    ll operator * (Point other) const{
        return x * other.x + y * other.y;
    }

    Point operator +(Point other) const{
        return {x + other.x, y + other.y};
    }

    Point operator -(Point other) const{
        return {x - other.x, y - other.y};
    }

    friend istream& operator >> (istream& in, Point &p){
        in >> p.x >> p.y >> p.w;
        return in;
    }

    friend ostream& operator << (ostream& out, Point &p){
        out << p.x << " " << p.y;
        return out;
    }
};

struct Vector {
    ll x, y;
    int id1, id2;

    bool top() const{
        return (y > 0) || (y == 0 && x >= 0);
    };

    ll distq(Vector other = {0, 0}) const{
        return (other.x - x) * (other.x - x) + (other.y - y) * (other.y - y);
    }

    ld dist(Vector other = {0, 0}) const{
        return sqrt(distq(other));
    }

    ld cock;

    void rev(){
        x = -x, y = -y;
    }

    ll operator % (Vector other) const{
        return x * other.y - y * other.x;
    }

    ll operator * (Vector other) const{
        return x * other.x + y * other.y;
    }

    ll operator * (Point other) const{
        return x * other.x + y * other.y;
    }

    Vector operator +(Vector other) const{
        return {x + other.x, y + other.y};
    }

    Vector operator -(Vector other) const{
        return {x - other.x, y - other.y};
    }

    friend istream& operator >> (istream& in, Vector &p){
        in >> p.x >> p.y;
        return in;
    }

    friend ostream& operator << (ostream& out, Vector &p){
        out << p.x << " " << p.y << " " << p.id1 << " " << p.id2 << "  " << p.cock;
        return out;
    }
};

const int MAXN = 2003;

Point a[MAXN];
Vector vs[MAXN * MAXN];

int ids[MAXN];
int pos[MAXN];

ll pref[MAXN];

int n;

ptll tree[2 * MAXN];

void upd(int i, ll val){
    i += MAXN;
    for (tree[i] = ptll{val, val}; i > 1; i >>= 1){
        tree[i >> 1].x = min(tree[i].x, tree[i ^ 1].x);
        tree[i >> 1].y = max(tree[i].y, tree[i ^ 1].y);
    }
}

ll getmin(int l, int r){
    l += MAXN, r += MAXN;
    ll res = 1e18;
    while (l < r){
        if (l & 1)
            res = min(res, tree[l++].x);
        if (r & 1)
            res = min(res, tree[--r].x);
        l >>= 1, r >>= 1;
    }
    return res;
}

ll getmax(int l, int r){
    l += MAXN, r += MAXN;
    ll res = -1e18;
    while (l < r){
        if (l & 1)
            res = max(res, tree[l++].y);
        if (r & 1)
            res = max(res, tree[--r].y);
        l >>= 1, r >>= 1;
    }
    return res;
}

pt upds[MAXN * 2];

ll calc(int ln){
    ll res = 0;
    for (int j = 0; j < ln; j++){
        for (int i = upds[j].x; i <= upds[j].y; i++){
            ll mn = getmin(1, i + 1);
            ll mx = getmax(i + 1, n + 2);
            res = max(res, max(pref[i] - mn, mx - pref[i]));
        }
    }
    return res;
}

void run(){
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    if (n == 1){
        cout << max(0ll, a[0].w);
        return;
    }
    int m = 0;
    for (int i = 0; i < n; i++){
        for (int j = 0; j < n; j++){
            if (i == j)
                continue;
            vs[m++] = {-(a[j] - a[i]).y, (a[j] - a[i]).x, i, j, (ld)(a[i] % a[j]) / (a[i].y != a[j].y ? a[i].y - a[j].y : (a[j].x - a[i].x))};
        }
    }
    sort(vs, vs + m, [&](Vector p, Vector q){
        bool ta = p.top(), tb = q.top();
        if (ta != tb)
            return ta;
        ll cp = p % q;
        return (cp > 0 || (cp == 0 && p.cock < q.cock));
    });
    iota(ids, ids + n, 0);
    Vector start = {(int)2e9 + 110, -1};
    sort(ids, ids + n, [&](int i, int j){
        return start * a[i] < start * a[j];
    });
    for (int i = 1; i <= n; i++){
        pref[i] = pref[i - 1] + a[ids[i - 1]].w;
        upd(i + 1, pref[i]);
    }
    for (int i = 0; i < n; i++)
        pos[ids[i]] = i;
    ll ans = 0;
    for (int i = 0; i < m; i++){
        Vector curr = vs[i];
        int j = i;
        int head;
        int t = 0;
        for (; j < m && curr % vs[j] == 0 && curr * vs[j] >= 0; j++){
            head = j;
            for (; j + 1 < m && curr % vs[j + 1] == 0 && curr * vs[j + 1] >= 0 && abs(vs[head].cock - vs[j + 1].cock) < 1e-9; j++);
            int l = 1e9, r = -1;
            for (int k = head; k <= j; k++){
                l = min(l, pos[vs[k].id1]);
                l = min(l, pos[vs[k].id2]);
                r = max(r, pos[vs[k].id1]);
                r = max(r, pos[vs[k].id2]);
            }
            for (int k = l; k <= (l + r) / 2; k++){
                swap(ids[k], ids[r - k + l]);
                swap(pos[ids[k]], pos[ids[r - k + l]]);
            }
            for (int k = l; k <= r; k++){
                pref[k + 1] = pref[k] + a[ids[k]].w;
                upd(k + 2, pref[k + 1]);
            }
            upds[t++] = {l + 1, r + 1};
        }
        j--;
        ans = max(ans, calc(t));
        i = j;
    }
    cout << ans;
}

int main(){
#ifdef LOCAL
    freopen("input.txt", "r", stdin);
#else
    fastio();
    //freopen("", "r", stdin);
    //freopen("", "w", stdout);
#endif
    auto start = chrono::high_resolution_clock::now();
    run();
    auto stop = chrono::high_resolution_clock::now();
#ifdef LOCAL
    cerr << "Program finished in " << (ld)chrono::duration_cast<chrono::milliseconds>(stop - start).count() / 1e3 << " sec";
#endif
    return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

bulldozer.cpp: In function 'int main()':
bulldozer.cpp:268:10: warning: variable 'start' set but not used [-Wunused-but-set-variable]
  268 |     auto start = chrono::high_resolution_clock::now();
      |          ^~~~~
bulldozer.cpp:270:10: warning: variable 'stop' set but not used [-Wunused-but-set-variable]
  270 |     auto stop = chrono::high_resolution_clock::now();
      |          ^~~~

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