제출 #688577

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
688577		ksjsjsjsjsjsjs	Discharging (NOI20_discharging)	C++17	100 / 100	518 ms	291124 KiB

Discharging

#include <bits/stdc++.h>
using namespace std;
#define st first
#define nd second
#define pb push_back
#define pf push_front
#define _pb pop_back
#define _pf pop_front
#define lb lower_bound
#define ub upper_bound
#define bg begin
#define ed end
#define ins insert
#define ers erase
#define mtp make_tuple
#define sz(x) (int)(x).size()
#define all(x) (x).bg(), (x).ed
#define ft front
#define bk back
#define ll long long
#define ull unsigned long long
#define db double
#define ldb long double
#define str string
#define pi pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>
#define vpi vector<pi>
#define vpll vector<pll>
#define FOR(i, l, r) for (int i = (l); i <= (r); ++i)
#define FOS(i, r, l) for (int i = (r); i >= (l); --i)
#define FRN(i, n) for (int i = 0; i < (n); ++i)
#define FSN(i, n) for (int i = (n) - 1; i >= 0; --i)
#define EACH(i, x) for (auto &i : (x))
#define WHILE while
template<typename T> T gcd(T a, T b) { WHILE(b) { a %= b; swap(a, b); } return a; }
template<typename T> T lcm(T a, T b) { return a / gcd(a, b) * b; }
#define file "TEST"
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
ll rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }
struct Save {
    int i;
    pll v;
    Save() {}
    Save(int i, pll v) : i(i), v(v) {}
};
const int oo = 1e9 + 5;
const int T = 4e6 + 5;
const int N = 1e6 + 5;
const pll df = {0, 1e18};
int n, t[N], cnt[N];
ll d[N], d1[N];
ll cost(int i, pll d) { return 1LL * d.st * i + d.nd; }
pll tr[T];
vector<Save> s;
void upd(int i, int l, int r, pll v) {
    int mid = l + (r - l) / 2;
    if (cost(mid, v) < cost(mid, tr[i])) {
        s.pb(Save(i, tr[i]));
        swap(tr[i], v);
    }
    if (l == r) return;
    if (cost(l, tr[i]) > cost(l, v)) upd(i * 2, l, mid, v);
    else upd(i * 2 + 1, mid + 1, r, v);
}
ll get(int i, int l, int r, int q) {
    ll rs = cost(q, tr[i]);
    int mid = l + (r - l) / 2;
    if (l == r) return rs;
    if (q <= mid) rs = min(rs, get(i * 2, l, mid, q));
    else rs = min(rs, get(i * 2 + 1, mid + 1, r, q));
    return rs;
}
void roll(int cnt) {
    FRN(i, cnt) {
        tr[s.bk().i] = s.bk().v;
        s._pb();
    }
}
signed main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
//    freopen(file".inp", "r", stdin);
//    freopen(file".out", "w", stdout);
//    s.resize(2e7);
//    s.clear();
    cin >> n;
    FOR(i, 1, n) cin >> t[i];
    int pos = 0;
    FOR(i, 1, n << 2) tr[i] = df;
    deque<int> d2;
    FOS(i, n, 1) {
        WHILE(!d2.empty() && t[d2.bk()] <= t[i]) {
            roll(cnt[d2.bk()]);
            d2._pb();
        }
        d1[i] = 1LL * (n - i + 1) * t[i] + (d2.empty()? 0 : d[d2.bk()]);
        d2.pb(i);
        int pre = sz(s);
        upd(1, 1, n, {-t[i], d1[i] + 1LL * i * t[i]});
        cnt[i] = sz(s) - pre;
        d[i] = get(1, 1, n, i);
    }
    cout << d[1];
//    cerr << "\nTime: " << setprecision(5) << fixed << (ldb)clock() / CLOCKS_PER_SEC << "ms\n";
    return 0;
}
/*
*/

컴파일 시 표준 에러 (stderr) 메시지

Discharging.cpp: In function 'int main()':
Discharging.cpp:89:9: warning: unused variable 'pos' [-Wunused-variable]
   89 |     int pos = 0;
      |         ^~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 25 / 25
• Subtask 4: 11 / 11
• Subtask 5: 14 / 14
• Subtask 6: 28 / 28