Given two strings (say string A, string B).
Write a function that returns string A - string B.

Question

Given two strings (say string A, string B).
Write a function that returns string A - string B.

quasar · Accepted Answer

Look at the problem in the following way.
both strings A and B are set of characters 
so you are looking at set difference

string set_difference(string a, string b){
     map store;
     string ret;
     for(int i=0; i  symmetric_diff(vector s1, vector s2){
	
	map store;
	vector ret;
	for(int i=0; i  by a String that should work!!

Cheers :)

yaskil · Answer

here you have O(n^2) complexity and strlen(s2) bytes storage complexity. You can solve this problem with O(n) complexity without any storage requirement.

First sort both strings (sorting requires O(nlogn) complexity)
Then compare both strings in a loop. This loop requires O(n) complexity.

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