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Language: The Last Non-zero Digit
Description In this problem you will be given two decimal integer number N, M. You will have to find the last non-zero digit of the ^{N}P_{M}.This means no of permutations of N things taking M at a time.Input The input contains several lines of input. Each line of the input file contains two integers N (0 <= N<= 20000000), M (0 <= M <= N). Output For each line of the input you should output a single digit, which is the last non-zero digit of ^{N}P_{M}. For example, if ^{N}P_{M} is 720 then the last non-zero digit is 2. So in this case your output should be 2.Sample Input 10 10 10 5 25 6 Sample Output 8 4 2 Source |

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