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hint: if your solution is seemingly correct, but fails for 1-2 test cases, then the answer is that 0 is NOT a valid 1-digit number in this problem (just to save some hackos for you :-) )
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Permutation Problem
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hint: if your solution is seemingly correct, but fails for 1-2 test cases, then the answer is that 0 is NOT a valid 1-digit number in this problem (just to save some hackos for you :-) )