peach-assignment
Problem solving assignment solved in javascript
Questions
- Count of Mobile Number:
- Ideally, Mobile numbers are of digits (0-9) and all have the same length. However, some prefixes may be reserved (like 0 and number starting with 1 are toll numbers, and 100 is for Police). This limits the total number of possible full-length telephone numbers that are available for general use in the system.
- You are given two inputs:
-
- int: digits the length of the mobile numbers in the system.
-
- String[]: Set of prefixes which are reserved.
-
- Compute and return the number of different mobile numbers possible in the system.
- Definition
- Method signature:
int possibleMobileNumbers(int digits, String[] reserved)
- Method signature:
- Constraints
- digits will be between 1 and 10, inclusive.
- reserved will contain between 0 and 50 elements, inclusive.
- Examples
- 7 , ["0","2","100"]
- Returns: 7990000
- 6, ["1","2","3"]
- Returns: 700000
- 3, ["411"]
- Returns: 999
- 7 , ["0","2","100"]
- Maths Expression
- Given an array of 5 integers how will you make mathematical expression to achieve the required number using operators(+,- *).
- You are given two inputs:
- Integer[]: Array of 5 integers.
- Number: Number to achieve.
- For Example:
- If array is [1, 2 ,3, 4, 5] and number to compute is 35 here it can be created by:
((((2*3)*5)+4)+1) =35
- If array is [1, 2 ,3, 4, 5] and number to compute is 35 here it can be created by:
- Compute and return true if mathematical expression can be created or false if we can't create a mathematical expression return empty array.
- Method signature:
boolean createMathExpression(int[] integers, int number) - Examples
- [ 1 ,1, 1, 1 ,1 ],35
- Returns: false
- [1,2 ,3 ,4 ,5],35
- Returns: true
- [ 1 ,1, 1, 1 ,1 ],35