JAVA--Fill in the TODO's

package algs15.perc;

//import stdlib.*;

// Uncomment the import statements above.

// You can test this using InteractivePercolationVisualizer and PercolationVisualizer // All methods should make at most a constant number of calls to the UF data structure, // except percolates(), which may make up to N calls to the UF data structure. public class Percolation { int N; boolean[] open; // TODO: more fields to add here public Percolation(int N) { this.N = N; this.open = new boolean[N*N]; // TODO: more to do here } // open site (row i, column j) if it is not already public void open(int i, int j) { open[i*N+j] = true; // TODO: more to do here. } // is site (row i, column j) open? public boolean isOpen(int i, int j) { return open[i*N+j]; } // is site (row i, column j) full? public boolean isFull(int i, int j) { // TODO return false; } // does the system percolate? public boolean percolates() { // TODO return false; } }