1251A - Broken Keyboard - CodeForces Solution

brute force strings two pointers *1000

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Python Code: 

q=int(input())
for _ in range(q):
    n=input()
    s=sorted(set(n))
    p=''
    for i in s:
        if n.count(i)>2*n.count(i+i):
            p=p+i
    print(p)


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