int pinArray = new int[4][7]{
  {3, 5, 6, 9, 10, 11, 13},
  {A1, A2, A3, A4, A5, 4},
  {A0, 0, 1, 2},
  {7, 8, 12}
};

int configArray = new int[3] [0, 0, 0];

void setup() {
  // setup pins
  for (int i = 0; i < 7; i++) {
    pinMode(pinArray[0][i], OUTPUT);
  } //Board 0 pins

  for (int i = 0; i < 6; i++) {
    pinMode(pinArray[1][i], INPUT);
  } //Board 1 pins

  pinMode(pinArray[2][0], INPUT);
  for (int i = 1; i < 4; i++) {
    pinMode(pinArray[2][i], OUTPUT);
  } //Board 2 pins

  for (int i = 0; i < 3; i++) {
    pinMode(pinArray[3][i], INPUT);
  } //Board 3 pins


}

void loop() {
  // put your main code here, to run repeatedly:

}

void randConfig() {
  // randomises the solutions to each board
  configArray[0] = floor(rand() * 3);
  configArray[1] = floor(rand() * 256);
  configArray[2] = floor(rand() * 3);

  // setup lights to show configuration
  if ((configArray[0] + configArray[2])%2 !== 0) {

  }
}