Given a positive number n, print a number less than n such that all its digits are distinct.
Input : 1134 Output : 1098 1098 is the largest number smaller than 1134 such that all digits are distinct. Input : 4559 Output : 4539
The problem can easily be solved by using counting. Firstly, loop through numbers less than n and for each number count the frequency of the digits using count array. If all the digits occur only once than we print that number. The answer always exists so there is no problem of infinite loop.
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