starting from right find first digit less then right most digit,if no any
digit is less,then move to next right most and compair ,,,,when found
exchange those no,
now sort the no.s up to that index of the given no which is exchanged:
Ex:
43987723893239876
first required sequence: 439877238932[3]987[6] swap these no
439877238932[6]{987[3]}
now sort in decreasing order 439877238932[6]{3789} this is the required no
....correct me if any thing wrong
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