Given a string S and a range L and R, the task is to print the lexicographically largest string that can be formed from the characters in range L and R.
Input: str = "thgyfh", L = 2, R = 6 Output: yhhgf Input: str = "striver", L = 3, R = 5 Output: vri
- Iterate from min(L, R) to max(L, R) and increase the frequencies of characters in a freq array.
- Iterate from 25 to 0 and print the number of times every character occurs to get the lexicographically largest string.
The common point of mistake which everyone does is they iterate from L to R instead of min(L, R) to max(L, R).
Below is the implementation of the above approach:
Time Complexity – O(N)
Each element gets added to the frequency table only once which takes O(1) and is appended to string which also takes O(1).
- Lexicographically smallest string formed by appending a character from the first K characters of a given string
- Lexicographically smallest string formed by appending a character from first K characters of a string | Set 2
- Number of ways in which the substring in range [L, R] can be formed using characters out of the range
- Lexicographically smallest string formed by removing at most one character
- Lexicographically largest sub-sequence of the given string
- Swap all occurrences of two characters to get lexicographically smallest string
- Find the lexicographically largest palindromic Subsequence of a String
- Check whether second string can be formed from characters of first string
- Find the number of strings formed using distinct characters of a given string
- Largest sub-string where all the characters appear at least K times
- Find largest word in dictionary by deleting some characters of given string
- Program to find the largest and smallest ASCII valued characters in a string
- Lexicographically smallest and largest substring of size k
- Make lexicographically smallest palindrome by substituting missing characters
- Lexicographically largest subsequence such that every character occurs at least k times
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