检查 arrays 的第一个元素是否在数组中

Question

   int[][] myarray = 
  {             {1,0},
                {3,2},
                {0,1},
                {2,3}
        };

in HashMap i can use containsKey(i)or,containsValue(i) to check if i was used; is it possible to do the same with array? i mean to check if in myarray i1 values z

i1 == the group of the first elements of each array inside myarray

in my example {1,3,0,2}

if  myarray[:,0] =  2  
    print("Numbers match")

Answer 1

As far as I understood your question, you want to check if the first element of every inner array is unique or not.

A simple solution is to loop through the outer array, access the first element of the inner array, and do the comparison with the new value.

Edit: create a small method alreadyPresent() that returns a boolean value after searching.

if (aleadyPresent(newValue)){
    print("Value already present")
}