牛客网刷题 二维数组中的查找

public static boolean Find(int target, int [][] array) {

        if(array==null || (array.length==1 && array[0].length==0)){
            return false;
        }
        int index = -1;
        for (int i = 0; i < array.length; i++) {
            Integer first = array[i][0];
            if(first == target){
                return true;
            }
            if(first>target){
                index = i;
                break;
            }
            index = i;
        }
        if(index <= 0){
            return false;
        }

        int rowIndex = -1;
        for (int i = index; i >= 0; i--) {
            int[] rows = array[i];
            rowIndex = rows.length - 1;
            for (int j = 0; j <= rowIndex; j++) {
                Integer value = rows[j];
                if(value == target){
                    return true;
                }
                if(value>target){
                    rowIndex = j;
                    continue;
                }
            }
        }
        return false;
    }