Submission #855126

#	Time	Username	Problem	Language	Result	Execution time	Memory
855126		FairyWinx	Overtaking (IOI23_overtaking)	C++17	19 / 100	3 ms	856 KiB

overtaking

#include <bits/stdc++.h>

#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()

using namespace std;

vector<vector<long long>> res;
vector<int> s;
vector<pair<int, long long>> t; // speed, time
int n, m;
int x;

vector<vector<int>> pos_layer;
vector<vector<int>> who_layer;
vector<vector<int>> nxt_in_layer;
vector<vector<long long>> res_layer;

void init(int l, int _n, vector<long long> _t, vector<int> _w, 
            int _x, int _m, vector<int> _s) {

    
    x = _x, n = _n, m = _m;
    s = _s;
    t.resize(n);
    for (int i = 0; i < n; ++i) {
        t[i].first = _w[i];
        t[i].second = _t[i];
    }
    sort(rall(t));
    while (t.size() && t.back().first <= x) {
        t.pop_back();
    }
    n = t.size();

    pos_layer.resize(m, vector<int> (n));
    who_layer.resize(m, vector<int> (n));
    nxt_in_layer.resize(m, vector<int> (n, -1));
    res_layer.resize(m, vector<long long> (n));

    res.resize(m, vector<long long> (n, -1));
    s = _s;

    for (int i = 0; i < n; ++i) {
        res[0][i] = t[i].second;
    }
    for (int i = 0; i < m - 1; ++i) {
        for (int j = 0; j < n; ++j) {
            long long s1 = 1ll * (s[i + 1] - s[i]) * t[j].first;
            res[i + 1][j] = res[i][j] + s1;
            for (int k = 0; k < j; ++k) {
                if (res[i][j] > res[i][k] && res[i][j] + s1 < res[i + 1][k]) {
                    res[i + 1][j] = max(res[i + 1][j], res[i + 1][k]);
                }
            }
        }
    }

    for (int i = 0; i < m; ++i) {
        vector<int> p(n);
        iota(all(p), 0);
        sort(p.begin(), p.end(), [&] (const int &a, const int &b) {
            return make_pair(res[i][a], a) < make_pair(res[i][b], b);
        });
        for (int j = 0; j < n; ++j) {
            pos_layer[i][p[j]] = j;
            who_layer[i][j] = p[j];
        }
        for (int j = 0; j < n; ++j) {
            for (int k = j - 1; k >= 0; --k) {
                if (res[i][who_layer[i][j]] > res[i][who_layer[i][k]]) {
                    nxt_in_layer[i][j] = k;
                    break;
                }
            }
        }
    }
    for (int i = 0; i < n; ++i) {
        res_layer[m - 1][pos_layer[m - 1][i]] = res[m - 1][i];
    }
    for (int i = m - 2; i >= 0; --i) {
        for (int j = 0; j < n; ++j) { // y = res[i][j].
            int ind_j = pos_layer[i][j];
            if (nxt_in_layer[i][ind_j] == -1) {
                res_layer[i][pos_layer[i][j]] = res[i][j] + 1ll * x * (s.back() - s[i]);
                continue;
            }
            int ind_less = who_layer[i][nxt_in_layer[i][ind_j]];
            for (int k = i + 1; k < m; ++k) {
                if (res[k][ind_less] >= res[i][j] + 1ll * x * (s[k] - s[i])) {
                    res_layer[i][pos_layer[i][j]] = res_layer[k][pos_layer[k][ind_less]];
                } else if (k == m - 1) {
                    res_layer[i][pos_layer[i][j]] = res[i][j] + 1ll * x * (s[k] - s[i]);
                }
            }
        }
    }
}

long long arrival_time(long long y) {
    int ind = -1;
    for (int i = 0; i < n; ++i) {
        if (res[0][who_layer[0][i]] < y)
            ind = who_layer[0][i];
    }
    if (ind == -1) {
        return 1ll * x * (s.back()) + y;
    }
    for (int i = 0; i < m; ++i) {
        if (1ll * x * s[i] + y <= res[i][ind]) {
            return res_layer[i][pos_layer[i][ind]];
        }
    }
    return 1ll * x * s.back() + y;
}

#ifdef LOCAL
int main()
{
    // BEGIN SECRET
    const std::string input_secret = "XwWPuInrOjpekAwGKojzwKw3yVDtdkGS";
    const std::string output_secret = "mGlgT4yvr1qPbquFwkxRVh9hMn0Mrxoz";
    char secret[1000];
    assert(1 == scanf("%999s", secret));
    if (std::string(secret) != input_secret)
    {
        printf("%s\n", output_secret.c_str());
        printf("PV\n");
        printf("Possible tampering with the input\n");
        fclose(stdout);
        return 0;
    }
    // END SECRET
    int L, N, X, M, Q;
    assert(5 == scanf("%d %d %d %d %d", &L, &N, &X, &M, &Q));
    std::vector<long long> T(N);
    for (int i = 0; i < N; i++)
        assert(1 == scanf("%lld", &T[i]));
    std::vector<int> W(N);
    for (int i = 0; i < N; i++)
        assert(1 == scanf("%d", &W[i]));
    std::vector<int> S(M);
    for (int i = 0; i < M; i++)
        assert(1 == scanf("%d", &S[i]));
    std::vector<long long> Y(Q);
    for (int i = 0; i < Q; i++)
        assert(1 == scanf("%lld", &Y[i]));

    fclose(stdin);

    init(L, N, T, W, X, M, S);
    std::vector<long long> res(Q);
    for (int i = 0; i < Q; i++)
        res[i] = arrival_time(Y[i]);

    // BEGIN SECRET
    printf("%s\n", output_secret.c_str());
    printf("OK\n");
    // END SECRET
    for (int i = 0; i < Q; i++)
        printf("%lld\n", res[i]);
    fclose(stdout);
    return 0;
}
#endif

• Subtask 0: 0 / 0
• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 0 / 20
• Subtask 4: 0 / 26
• Subtask 5: 0 / 35