Submission #601761

#	Time	Username	Problem	Language	Result	Execution time	Memory
601761		Mazaalai	Meetings (IOI18_meetings)	C++17	0 / 100	48 ms	1876 KiB

meetings

#include "meetings.h"
#include <bits/stdc++.h>
#define sz(x) (int)x.size()
#define ALL(x) x.begin(), x.end()
#define chmax(a, b) a=max(a,b)
#define chmin(a, b) a=min(a,b)
#define pb push_back
#define ff first
#define ss second
using namespace std;
using ll = long long;
using VI = vector <int>;
using PII = pair <int, int>;
int n, m, q;
const int N = 1e5+1;
const int M = 3*N;
int nums[N];
struct Node {
    int l, r, L, R, mx;
} node[M];
Node zero = {0, 0, 0};
Node merge(int L, int R, Node a, Node b) {
    Node res = {
        (a.mx == a.R-a.L+1 ? a.mx : 0) + b.l,
        a.r + (b.mx == b.R - b.L + 1 ? b.mx : 0), 
        L,
        R,
        max(a.mx, b.mx)
    };
    res.mx = max({res.mx, res.l, res.r, a.r+b.l});
    return res;
}
void build(int l, int r, int head) {
    if (l == r) {
        int x = (nums[l] == 1);
        node[head] = {x, x, l, r, x};
        return;
    }
    int mid = (l+r)>>1;
    build(l, mid, head*2+1);
    build(mid+1, r, head*2+2);
    node[head] = merge(l, r, node[head*2+1], node[head*2+2]);
}
Node query(int l, int r, int L, int R, int head) {
    if (l > R || L > r) return zero;
    if (L <= l && r <= R) return node[head];
    int mid = (l+r)>>1;
    return merge(
        l, r,
        query(l, mid, L, R, head*2+1),
        query(mid+1, r, L, R, head*2+2)
    );
}
vector<long long> minimum_costs(vector<int> h, vector<int> L, vector<int> R) {
    n = sz(h);
    q = sz(L);
    vector<long long> ans(q, 1e18);
    for (int i = 0; i < n; i++) nums[i] = h[i];
    build(0, n-1, 0);
    for (int i = 0; i < q; i++) {
        int len = R[i] - L[i] + 1;
        ans[i] = len * 2 - query(0, n-1, L[i], R[i], 0).mx;
    }
    return ans;
}

• Subtask 1: 0 / 4
• Subtask 2: 0 / 15
• Subtask 3: 0 / 17
• Subtask 4: 0 / 24
• Subtask 5: 0 / 40