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First non-repeating character in a stream
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First non-repeating character in a stream
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class Solution
{
public String FirstNonRepeating(String A)
{
// code here
int[] count = new int[26];
Queue<Character> que = new LinkedList<>();
StringBuilder sb = new StringBuilder();
for(int i=0; i< A.length(); i++)
{
char ch = A.charAt(i);
int value = ch - 'a';
count[value]++;
if(count[value] <= 1)
{
que.add(ch);
}
else
{
que.remove(ch);
}
if(que.isEmpty())
{
sb.append('#');
}
else
{
sb.append(que.peek());
}
}
return sb.toString();
}
}