Submission #1123718

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123718		underwaterkillerwhale	Meetings (IOI18_meetings)	C++20	36 / 100	134 ms	16456 KiB

meetings

#include <bits/stdc++.h>
#define ll long long
#define rep(i, m, n) for (int i = (m); i <= (n); i++)
#define REB(i, m, n) for (int i = (m); i >= (n); i--)
#define iter(v, id) for (auto v : id)
#define pii pair<int, int>
#define pll pair<ll, ll>
#define MP make_pair
#define fs first
#define se second
#define bit(msk, i) ((msk >> i) & 1)
#define pb push_back
#define SZ(v) (int)v.size()
#define ALL(v) v.begin(), v.end()

using namespace std;

mt19937_64 rd(chrono::steady_clock::now().time_since_epoch().count());
ll Rand(ll l, ll r) { return uniform_int_distribution<ll>(l, r)(rd); }

const int N = 1e6 + 7;
const int Mod = 1e9 + 7;
const ll INF = 1e18 + 7;
const int BASE = 137;

int n, Q;
int a[N];
pii qr[N];

namespace sub2 {
    int suf[N], pre[N];
    ll ssuf[N], spre[N];

    vector<ll> solution() {
        vector<ll> Ans(Q + 3, INF);
        rep (i, 1, n) {
            suf[i] = pre[i] = ssuf[i] = spre[i] = a[i];
            REB (j, i - 1, 1) suf[j] = max(suf[j + 1], a[j]), ssuf[j] = ssuf[j + 1] + suf[j];
            rep (j, i + 1, n) pre[j] = max(pre[j - 1], a[j]), spre[j] = spre[j - 1] + pre[j];
            rep (q, 1, Q) {
                if (qr[q].fs <= i && i <= qr[q].se) Ans[q] = min(Ans[q], ssuf[qr[q].fs] + spre[qr[q].se] - a[i]);
            }
        }
//        rep (i, 1, Q) {
//            cout << Ans[i] <<"\n";
//        }
        return vector<ll> (Ans.begin() + 1, Ans.begin() + 1 + Q);
    }
}

namespace sub3 {

    bool check () {
        rep (i, 1, n) if (a[i] > 2) return 0;
        return 1;
    }

    int L2[N], R2[N];
    int spt[N][25], lg[N];

    vector<ll> solution() {///ko long long dc
        rep (i, 1, n) {
            L2[i] = a[i] == 2 ? i : L2[i - 1];
        }
        R2[n + 1] = n + 1;
        REB (i, n, 1) {
            R2[i] = a[i] == 2 ? i : R2[i + 1];
        }
        rep (i, 1, n) {
            spt[i][0] = max(0, R2[i] - L2[i] - 1);
            lg[i] = log2(i);
        }
        for (int j = 1; (1 << j) <= n; ++j) {
            for (int i = 1; i + (1 << j) - 1 <= n; ++i) {
                spt[i][j] = max(spt[i][j - 1], spt[i + (1 << j - 1)][j - 1]);
            }
        }
        auto get = [&] (int L, int R) {
            if (L > R) return 0;
            int K = lg[R - L + 1];
            return max(spt[L][K], spt[R - (1 << K) + 1][K]);
        };
        vector<ll> Ans(Q + 3, 0);
        rep (q, 1, Q) {
            int L = qr[q].fs, R = qr[q].se;
            Ans[q] = min({get(R2[L], L2[R]) + (R - L + 1 - get(R2[L], L2[R])) * 2,
                         R - max(L - 1, L2[R]) + (R - L + 1 - (R - max(L - 1, L2[R]))) * 2,
                         min(R2[L], R + 1) - L + (R - L + 1 - (min(R2[L], R + 1) - L)) * 2});
//            cout << Ans[q] <<"\n";
        }
        return vector<ll> (Ans.begin() + 1, Ans.begin() + 1 + Q);
    }

}

vector<ll> minimum_costs (vector<int> H, vector<int> L, vector<int> R) {
    n = SZ(H);
    Q = SZ(L);
    rep (i, 1, n) a[i] = H[i - 1];
    rep (i, 1, Q) qr[i].fs = L[i - 1] + 1, qr[i].se = R[i - 1] + 1;
    if (n <= 5000 && Q <= 5000) return sub2 :: solution();
    else if (sub3 :: check()) return sub3 :: solution();
}

void process() {
    cin >> n >> Q;
    rep (i, 1, n) cin >> a[i];
    rep (i, 1, Q) {
        cin >> qr[i].fs >> qr[i].se;
    }
    if (n <= 5000 && Q <= 5000) sub2 :: solution();
    else if (sub3 :: check()) sub3 :: solution();
}

//#define file(name) if(fopen(name".inp","r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
//main () {
////    file("c");
//    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
//    int num_Test = 1;
////    cin >> num_Test;
//    while (num_Test--) {
//        process();
//    }
//}
/*
onepunch +28

*/

Compilation message (stderr)

meetings.cpp: In function 'std::vector<long long int> minimum_costs(std::vector<int>, std::vector<int>, std::vector<int>)':
meetings.cpp:103:1: warning: control reaches end of non-void function [-Wreturn-type]
  103 | }
      | ^

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