How should I practice Valid String Check?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Uber online assessment problems in FastPrep.

Is Valid String Check associated with Uber?

FastPrep tags this as a Uber online assessment coding practice problem when the problem catalog has that company and stage context.

Valid String Check

Uber● EasyOA

Problem statement

Given a string, check if it is valid (return 1 :) or not (return 0 :). A valid string must:

Be divisible by 3 (interpreted as the numeric value of the string is divisible by 3).
Contain the digit '7' at least twice.

Function

isValidString(s: String) → int

Examples

Example 1

s = "771"return = 1

Example 2

s = "777"return = 1

Example 3

s = "123777"return = 1

Example 4

s = "12345"return = 0

Example 5

s = "71"return = 0

Example 6

s = "171"return = 0

Example 7

s = "70"return = 0