[题目3]二维数组中的查找

 代码实现：

package j2;

/**
 * 二维数组中的查找
 * Created by admin on 2019/5/15.
 */
public class ArrayFind {

    public static boolean find(int [][]matrix,int rows,int cols,int key){
        boolean found = false;
        //边界判断
        if (matrix != null && rows>=0 && cols>=0) {
            int row = 0;
            int col = cols-1;
            while (row < rows && col>0){
                if (matrix[row][col] == key) {
                    found = true;
                    break;
                } else if(matrix[row][col] > key){
                    col--;
                } else {
                    row++;
                }
            }
        }
        return found;
    }

    public static void main(String[] args) {
        int[][]ma = {
                {1,2,8,9},
                {2,4,9,12},
                {4,7,10,13},
                {6,8,11,15}
        };
        boolean result = find(ma,4,4,5);
        System.out.println(result);
    }

}