Submission #1123730

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123730		math_rabbit_1028	Nile (IOI24_nile)	C++20	36 / 100	2094 ms	14004 KiB

nile

#include "nile.h"
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pll;

int N;
struct minseg {
    ll tree[404040];
    void init(int v, int st, int ed) {
        if (st == ed) {
            tree[v] = 1e18;
            return;
        }
        int mid = (st+ed)/2;
        init(2*v, st, mid);
        init(2*v+1, mid+1, ed);
        tree[v] = min(tree[2*v], tree[2*v+1]);
    }
    void update(int v, int st, int ed, int idx, ll val) {
        if (st > idx || ed < idx) return;
        if (st == idx && ed == idx) {
            tree[v] = min(tree[v], val);
            return;
        }
        int mid = (st+ed)/2;
        update(2*v, st, mid, idx, val);
        update(2*v+1, mid+1, ed, idx, val);
        tree[v] = min(tree[2*v], tree[2*v+1]);
    }
    ll get(int v, int st, int ed, int lt, int rt) {
        if (lt > ed || rt < st) return 1e18;
        if (lt <= st && ed <= rt) return tree[v];
        int mid = (st+ed)/2;
        return min(get(2*v, st, mid, lt, rt), get(2*v+1, mid+1, ed, lt, rt));
    }
} o1, o2, e1, e2;

vector<pll> C;
ll block(int st, int ed, int D) { // [st, ed]
    if ((ed-st)%2 == 1) return 0;
    if (st%2) return min(o1.get(1, 0, N-1, st, ed), e2.get(1, 0, N-1, st, ed));
    else return min(e1.get(1, 0, N-1, st, ed), o2.get(1, 0, N-1, st, ed));
}

vector<ll> calculate_costs(vector<int> W, vector<int> A, vector<int> B, vector<int> E) {
    int Q = (int)E.size();
    N = (int)W.size();

    ll sum = 0;
    for (int i = 0; i < N; i++) sum += B[i];
    vector<ll> R(Q, sum);
    for (int i = 0; i < N; i++) C.push_back({W[i], A[i]-B[i]});
    sort(C.begin(), C.end());

    o1.init(1, 0, N-1);
    e1.init(1, 0, N-1);
    for (int i = 0; i < N; i++) {
        if (i%2) o1.update(1, 0, N-1, i, C[i].second);
        else e1.update(1, 0, N-1, i, C[i].second);
    }

    for (int t = 0; t < Q; t++) {
        o2.init(1, 0, N-1);
        e2.init(1, 0, N-1);
        ll D = E[t];
        for (int i = 1; i < N-1; i++) {
            if (W[i+1] - W[i-1] > D) continue;
            if (i%2) o2.update(1, 0, N-1, i, C[i].second);
            else e2.update(1, 0, N-1, i, C[i].second);
        }
        int st = 0;
        while (st < N) {
            for (int i = st+1; i <= N; i++) {
                if (i == N || C[i].first - C[i-1].first > D) {
                    R[t] += block(st, i-1, D);
                    st = i;
                    break;
                }
            }
        }
    }

    return R;
}

• Subtask 0: 0 / 0
• Subtask 1: 6 / 6
• Subtask 2: 13 / 13
• Subtask 3: 17 / 17
• Subtask 4: 0 / 11
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15
• Subtask 7: 0 / 18