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Try checking is the next permutated string is actually greater than the original string or not.
Try
if(next_str.equals(str)||next_str.compareTo(str)<1)System.out.println("no answer");
permutated string=next_str
original=string
Now if the permutated string compareTo original string is smaller then print "no answer" because it is actually smaller than the original string.
It happens when pivot=swap=0 means rest of the characters are already smaller.
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Bigger is Greater
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Try checking is the next permutated string is actually greater than the original string or not. Try if(next_str.equals(str)||next_str.compareTo(str)<1)System.out.println("no answer"); permutated string=next_str original=string Now if the permutated string compareTo original string is smaller then print "no answer" because it is actually smaller than the original string. It happens when pivot=swap=0 means rest of the characters are already smaller.