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  1. Prepare
  2. Data Structures
  3. Queues
  4. Truck Tour
  5. Discussions

Truck Tour

  • GrahamS
     + 1 comment

    I used a <vector> rather than a <queue>, and then just wrapped the index around to make it a circular queue. Still a "queue-based solution" but a bit more efficient than repeatedly pushing and popping elements.

    struct Pump {
    int fuel;
    int distanceToNext;
    Pump(int f,int d) : fuel(f), distanceToNext(d) {}
};

bool getTruckin (vector<Pump>& pumps, int startPump) {
    int fuelInTank = 0;
    int currentPump = startPump;
    
    while (true) {
        fuelInTank += pumps[currentPump].fuel; // Fill her up
        
        if (fuelInTank < pumps[currentPump].distanceToNext) {
            // Not enough fuel to reach next pump
            return false; 
        } else {
            int nextPump = (currentPump + 1) % pumps.size();
            if (nextPump == startPump) {
                return true; // Completed loop
            } else {
                fuelInTank -= pumps[currentPump].distanceToNext;
                currentPump = nextPump; // Keep on truckin
            }
        }
    }
}