在二维数组中查找一个数，二维数组是从左到右，从上到下依次递增

public class FindNum {
    public static boolean findANum(int[][] array, int target) {
        int row = array.length;//行数
        int cloumn = array[0].length;//列数
        int i = 0;
        int j = cloumn - 1;
        boolean found = false;
        while(i <= row-1 && j >= 0) {
            if(target < array[i][j]) {
                j--;
            }
            if(target > array[i][j]) {
                i++;
            }
            if(target == array[i][j]) {
                found = true;
                break;
            }
        }
        return found;
    }
    
    public static void main(String[] args) {
        int a[][]  = {{1,2,8,9},{2,4,9,12},{4,7,10,13}};
        System.out.println(a.length);
        System.out.println(a[0].length);
        System.out.println(findANum(a, 7));
        
    }

}