Hacks

2009 FRQ 3b
2017 FRQ 1b
2019 FRQ 3b

// 09 - 3b
// We are assuming that getChargingCost() works well
public class BatteryCharger {

    public int getChargeStartTime(int chargeTime) {
        int starting = 0;
        for (int j = 1; j < 24; j++) {
            if (this.getChargingCost(j, chargeTime) < this.getChargingCost(starting, chargeTime)) starting = j;
        }
        return starting;
    }
}

BatteryCharger bat = new BatteryCharger();
bat.getChargeStartTime(6);

// 17 - 1b
import java.util.*;

public class Digits {
    private ArrayList<Integer> digitList;

    public Digits(int num) {
        digitList = new ArrayList<Integer>();

        if (num==0){
            digitList.add(new Integer(0));
        }
        while (num > 0) {
            digitList.add(0, new Integer(num % 10));
            num /= 10;
        }

    }

    public boolean isStrictlyIncreasing() {
        boolean increase = true;

        for (int i = 0; i < digitList.size() - 1; i++) {
            if (digitList.get(i).intValue() >= digitList.get(i + 1).intValue()) {
                increase = false;
                return increase;
            }
        }
        return increase;
    }
}

System.out.println(new Digits(1356).isStrictlyIncreasing());
System.out.println(new Digits(1536).isStrictlyIncreasing());

true
false

// 19 - 3b
public class Delimiters {
    private String openDel;
    private String closeDel;

    public Delimiters(String open, String close) {

    }
    public ArrayList<String> getDelimitersList(String[] tokens){

    }
    public boolean isBalanced(ArrayList<String> delimiters) {
        int opencount = 0;
        int closecount = 0;

        for (int i = 0; i < delimiters.size(); i++) {
            if (delimiters.get(i) == openDel) {
                opencount++;
            }
            else if (delimiter.get(i) == closeDel) {
                closecount++;
            }

            if (closecount > opencount) {
                return false;
            }
        }
        return true;

    }

}