Lexicographical concatenation of all substrings of a string
Given a string, find concatenation of all substrings in lexicographic order.
Examples:
Input : s = “abc”
Output : aababcbbcc
The substrings of s in lexicographic order are “a”, “b”, “c”, “ab”, “abc”, “bc”. Concatenation of substrings is “a”+”ab”+”abc”+”b”+”bc”+”c” = “aababcbbcc”.Input : s = “cba”
Output : abbaccbcba
1. Find all the substrings of string and store it in a string array. The size of array would be n*(n+1)/2 where n is length of input string.
2. Sort the string array to make them all in lexicographical order.
3. Concatenate the strings of string array in another empty string.
// CPP Program to create concatenation of all // substrings in lexicographic order. #include <bits/stdc++.h> using namespace std; string lexicographicSubConcat(string s) { int n = s.length(); // Creating an array to store substrings int sub_count = n*(n+1)/2; string arr[sub_count]; // finding all substrings of string int index = 0; for (int i = 0; i < n; i++) for (int len = 1; len <= n - i; len++) arr[index++] = s.substr(i, len); // Sort all substrings in lexicographic // order sort(arr, arr + sub_count); // Concatenating all substrings string res = ""; for (int i = 0; i < sub_count; i++) res += arr[i]; return res; } int main() { string s = "cba"; cout << lexicographicSubConcat(s); return 0; } |
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Output:
aababcbbcc
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