Submission #990957

#	Time	Username	Problem	Language	Result	Execution time	Memory
990957		alex_2008	Overtaking (IOI23_overtaking)	C++17	65 / 100	3522 ms	49744 KiB

overtaking

#include "overtaking.h"
#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <map>
using namespace std;
typedef long long ll;
vector<vector<pair<ll, ll>>> dp;
vector<vector<ll>> esim;
vector<ll> t, w, s;
ll n, x, l, m;
bool cmp(pair<ll, ll> x, pair<ll, ll> y) {
    if (x.first != y.first) return x.first < y.first;
    if (w[x.second] != w[y.second]) return w[x.second] < w[y.second];
    return x.second < y.second;
}
void init(int L, int N, vector<ll> T, vector<int> W, int X, int M, vector<int> S) {
    t.clear();
    w.clear();
    s.clear();
    esim.clear();
    dp.clear();
    m = M;
    l = L;
    x = X;
    n = 0;
    for (auto& it : S) {
        s.push_back(it);
    }
    for (ll i = 0; i < N; i++) {
        if (W[i] > x) {
            t.push_back(T[i]);
            w.push_back(W[i]);
            n++;
        }
    }
    dp.resize(m);
    esim.resize(m);
    for (ll i = 0; i < n; i++) {
        dp[0].push_back({ t[i], i });
    }
    sort(dp[0].begin(), dp[0].end(), cmp);
    for (ll j = 1; j < m; j++) {
        ll cur_mx = 0;
        for (auto& it : dp[j - 1]) {
            cur_mx = max(cur_mx, it.first + w[it.second] * 1ll * (s[j] - s[j - 1]));
            dp[j].push_back({ cur_mx, it.second });
        }
        sort(dp[j].begin(), dp[j].end(), cmp);

        map<ll, ll> mp;
        for (auto& it : dp[j]) {
            mp[it.second] = it.first;
        }
        cur_mx = 0;
        for (auto& it : dp[j - 1]) {
            cur_mx = max(cur_mx, mp[it.second]);
            esim[j].push_back(cur_mx);
        }
    }
}
ll arrival_time(ll Y) {
    ll cur_ind = 0;
    for (auto& it : t) {
        if (it < Y) cur_ind++;
    }
    if (cur_ind == 0) {
        return l * 1ll * x + Y;
    }
    ll time = Y;
    for (ll i = 1; i < m; i++) {
        time = max(time + (s[i] - s[i - 1]) * 1ll * x, esim[i][cur_ind - 1]);
        while (cur_ind > 0 && dp[i][cur_ind - 1].first >= time) {
            cur_ind--;
        }
        if (cur_ind == 0) {
            return (l - s[i]) * 1ll * x + time;
        }
    }
    return time;
}
/*
int main() {
    int L, N, X, M, Q;
    cin >> L >> N >> X >> M >> Q;
    vector <ll> T(N);
    vector <int> W(N), S(M);
    for (auto &it : T) {
        cin >> it;
    }
    for (auto& it : W) {
        cin >> it;
    }
    for (auto& it : S) {
        cin >> it;
    }
    init(L, N, T, W, X, M, S);
    while (Q--) {
        ll k;
        cin >> k;
        cout << arrival_time(k) << "\n";
    }
}*/

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