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.

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Problem · String

Valid String Check

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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