Problem Solving Patterns
Frequency Counters -> USE OBJECTS!!
to avoid O(n^2)
example 1
ex) same([1,2,3)], [4,1,9]) // true
same([1,2,3],[1,9]) // false
same([1,2,1],[4,4,1]) // false
function same(arr1, arr2) {
if(arr1.length !== arr2.length) {
return false;
...
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