Given an integer N. You can select any two digits from this number (the digits can be same but their positions should be different) and order them in any one of the two possible ways. For each of these ways, you create a two digit number from it (might contain leading zeros). Then, you will pick a character corresponding to the ASCII value equal to this number, i.e. the number 65 corresponds to ‘A’, 66 to ‘B’ and so on. The task is to count the number of english alphabets (lowercase or uppercase) that can be picked in this way.
Input: N = 656
Only the characters ‘A’ (65) and ‘B’ (66) are possible.
Input: N = 1623455078
Approach: The idea is to observe that the total number of possible characters are (26 lowercase + 26 uppercase = 52). So, instead of generating all possible combinations of two digits from N, check the occurrences of these 52 characters.
Therefore, count the occurrences of each digit in N then for every character (lowercase or uppercase), find its ASCII value and check whether it can be picked from the given digits. Print the count of such alphabets in the end.
Below is the implementation of the above approach:
- Count numbers formed by given two digit with sum having given digits
- Find the count of numbers that can be formed using digits 3, 4 only and having length at max N.
- Find the sum of the ascii values of characters which are present at prime positions
- Smallest multiple of N formed using the given set of digits
- Maximum possible time that can be formed from four digits
- N digit numbers divisible by 5 formed from the M digits
- Minimum sum of two numbers formed from digits of an array
- Greatest number less than equal to B that can be formed from the digits of A
- Minimum sum of two numbers formed from digits of an array in O(n)
- Find the largest number that can be formed by changing at most K digits
- Check if the number formed by the last digits of N numbers is divisible by 10 or not
- Recursive sum of digits of a number formed by repeated appends
- Count of numbers between range having only non-zero digits whose sum of digits is N and number is divisible by M
- Count pairs of characters in a string whose ASCII value difference is K
- Count numbers in given range such that sum of even digits is greater than sum of odd digits
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