how to find separate value length in array?

Question

a=[1,1,1,2,2,2,2]
in this array there are three(1) and 4(2)
but now the question is what is the keyword or how to find the length of separate value in array?

Answer 1

Naveen K
One solution is You can use map to store counted value with each key.
https://code.sololearn.com/clJq45pF8okj/?ref=app