approved

JS only issue.
Randomize function from test cases is incorrect.
That lead to not unique letters in funnel.

function randomize(arr) {
  for (let i = 0; i < arr.length; i++)
    arr[Math.floor(Math.random() * arr.length)] = arr[i];
}

Must be something like:

function randomize(arr) {
  for (let i = 0; i < arr.length; i++) {
    const j = Math.floor(Math.random() * arr.length)
    const t = arr[i]
    arr[i] = arr[j]
    arr[j] = t
  }
}

in random tests used same array for solution and 'funk'. im added wrapper that copy array of family members

associative operation may not have an identity, think about (x,y) => x

just remove using namespace std;

try add #include <algorithm>

Yes, it is possible (did it just now).

not specified that 'obj' don't have any circular references, or maybe i misread)

Issue still exists.

Probably Test.assertSimilar compare Object.keys array, JSON.stringify or something like that.

Please use other compare function.

lol, deja vu

[
  { name: 'frog', age: 72 },
  { name: 'horse', age: 110 },
  { name: 'frog', age: 91 },
  { name: 'horse', age: 53 },
]
[ 
  { name: 'shaun', age: 88 },
  { name: 'john', age: 45 },
]
(im delete some rows with other names)

expected 'frog' to equal 'horse'

sum for both is 163 and frog < horse alphabetically

may be i miss something

Added new example and description for providePlan, check out.

You can pass completely fabricated plans, it will work properly.
I will add a note about how search process going, but the customer should not validate.