how to find a string has duplicate elements or not

Question

Raviteja Ainampudi · Accepted Answer

def func(x):
    y = {}
    for i in x:
        if i in y:
            y[i]+=1
        else:
            y[i]=1
            
    for i,j in y.items():
        if j > 1:
            return "Duplicates Present"
    return "No Duplicates"
    
print (func("Raviteja"))

Sigiloso · Answer

Approach taken by Raviteja works optimally in O(n) time, but takes additional O(n) space over this approach which uses bit manipulation. Algorithm used below uses O(n) time and O(1) space.

def is_unique_characters(input_string):
    # Checks corner case
    if len(input_string)>256:
        return False
    val = 0
    checker = 0
    for ch in input_string:
        val = ord(ch)-ord('a')
        # When element repeats
        if (checker & (1 0:
            return False
        checker |= (1<

Sigiloso · Answer

**Corrected**	
Approach taken by Raviteja works optimally in O(n) time, but takes additional O(n) space over this approach which uses bit manipulation. Algorithm used below uses O(n) time and O(1) space works for characters and integers.

def is_unique_characters(input_string):
    # Checks corner case
    if len(input_string)>256:
        return False
    val = 0
    checker = 0
    for ch in input_string:
        val = ord(ch)-ord('a')
        # When element repeats
        if (checker & (1 0):
            return False
        checker |= (1<

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