/*

My output:

25037
13204
13796

*/

public class MatrixTest {

	public int width;
	public int height;
	public int m[];
	
	public MatrixTest(int w, int h) {
		this.width = w;
		this.height = h;
		this.m = new int[w * h];
	}
	
	public int get(int x, int y) {
		return this.m[y * width + x];
	}
	
	public void set(int x, int y, int value) {
		this.m[y * width + x] = value;
	}
	
	public static void main (String[] args) {
		int w = 1000, h = 2000, passes = 400;
		
		int matrix[][] = new int[h][];
		
		for (int i = 0; i < h; ++i) {
			matrix[i] = new int[w];
		}
		
		long start;
		
		start = System.currentTimeMillis();
		
		// X and Y are inverted.
		
		for (int z = 0; z < passes; z++) {
			for (int x = 0; x < w; x++) {
				for (int y = 0; y < h; y++) {
					matrix[y][x] = matrix[y][x] + 1; 
				}
			}
		}
		
		System.out.println(System.currentTimeMillis() - start);
		
		//
		
		MatrixTest mt = new MatrixTest(w, h);
		
		start = System.currentTimeMillis();
		
		for (int z = 0; z < passes; z++) {
			for (int x = 0; x < w; x++) {
				for (int y = 0; y < h; y++) {
					mt.set(x, y, mt.get(x, y) + 1); 
				}
			}
		}
		
		System.out.println(System.currentTimeMillis() - start);
		
		//
		
		MatrixTest mt2 = new MatrixTest(w, h);
		
		start = System.currentTimeMillis();
		
		for (int z = 0; z < passes; z++) {
			for (int x = 0; x < w; x++) {
				for (int y = 0; y < h; y++) {
					mt2.m[y * w + x] = mt2.m[y * w + x] + 1; 
				}
			}
		}
		
		System.out.println(System.currentTimeMillis() - start);
	}
}