AP CS A 2019 FRQ #4

public LightBoard(int numRows, int numCols) {
  lights = new boolean[numRows][numCols];

  for(int i = 0; i < numRows; i++) {
    for(int j = 0; j < numCols; j++) {
      boolean temp = Math.random() < .4;
      lights[i][j] = temp;
    }
  }
}

public boolean evaluateLight(int row, int col) {
  int numLights = 0;
  for(int i = 0; i < lights.length; i++) {
    if(lights[i][col]) {
      numLights++;
    }
  }
  if(lights[row][col]) {
    return (numLights % 2 == 1);
  }
  else {
    return (numLights % 3 == 0);
  }
}