Submission #1220940

#	Time	Username	Problem	Language	Result	Execution time	Memory
1220940		PotatoMan	Overtaking (IOI23_overtaking)	C++17	Compilation error	0 ms	0 KiB

overtaking

#include "overtaking.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;

struct Bus {
    ll arrivalTime;
    ll pace;
    int id;
};

bool byArrivalThenPace(const Bus &a, const Bus &b) {
    if (a.arrivalTime == b.arrivalTime) return a.pace < b.pace;
    return a.arrivalTime < b.arrivalTime;
}

vector<Bus> buses;
vector<int> stations;
int N, M;

vector<ll> arrivalTimes_station[1005];

ll computeExpectedArrival(const Bus& b, int j) {
    return b.arrivalTime + (stations[j] - stations[j - 1]) * b.pace;
}

void init(int Lp, int Np, vector<ll> Tp, vector<int> Wp, int Xp, int Mp, vector<int> Sp) {
    buses.clear();
    stations = Sp;

    // Keep only buses with pace >= reserve pace Xp (Filtering)
    for (int i = 0; i < Np; i++) {
        if (Wp[i] >= Xp)
            buses.push_back({Tp[i], Wp[i], i});
    }

    // Add reserve bus
    buses.push_back({0, Xp, Np});
    N = (int)buses.size();
    M = Mp;

    // Simulate station by station
    for (int j = 1; j < M; j++) {
        sort(buses.begin(), buses.end(), byArrivalThenPace);

        ll curMax = 0;
        vector<ll> arrivalTimes;

        for (int i = 0; i < N; i++) {
            ll expected = computeExpectedArrival(buses[i], j);
            buses[i].arrivalTime = max(expected, curMax);
            curMax = max(curMax, buses[i].arrivalTime);
            arrivalTimes.push_back(buses[i].arrivalTime);
        }

        arrivalTimes_station[j] = arrivalTimes;
    }
}

ll arrival_time(ll Y) {
    // Reset buses to initial state for this query
    buses = buses_init;

    // Set reserve bus departure time
    for (auto &b : buses) {
        if (b.id == N - 1) {
            b.arrivalTime = Y;
            break;
        }
    }

    for (int j = 1; j < M; j++) {
        const vector<ll>& arrTimes = arrivalTimes_station[j];

        // Find first bus arriving strictly after current arrival
        int pos = upper_bound(arrTimes.begin(), arrTimes.end(), arrival) - arrTimes.begin();

        // Blocking bus arrival time is last bus arriving <= current arrival
        ll blockingArrival = (pos == 0) ? 0 : arrTimes[pos - 1];

        ll dist = stations[j] - stations[j - 1];
        arrival = max(arrival + dist * pace, blockingArrival);
    }
    return arrival;
}

Compilation message (stderr)

overtaking.cpp: In function 'll arrival_time(ll)':
overtaking.cpp:63:13: error: 'buses_init' was not declared in this scope
   63 |     buses = buses_init;
      |             ^~~~~~~~~~
overtaking.cpp:77:65: error: 'arrival' was not declared in this scope
   77 |         int pos = upper_bound(arrTimes.begin(), arrTimes.end(), arrival) - arrTimes.begin();
      |                                                                 ^~~~~~~
overtaking.cpp:83:40: error: 'pace' was not declared in this scope
   83 |         arrival = max(arrival + dist * pace, blockingArrival);
      |                                        ^~~~
overtaking.cpp:85:12: error: 'arrival' was not declared in this scope
   85 |     return arrival;
      |            ^~~~~~~