I make problem 1012 with long ariphmetic, but got WA #6
During some time I searched an error, and she appeared interesting:
in each slot of array I wrote down 7 numbers. For example number 76192801046017773930 (n=20, k=10) in my array looked so:
a[]={7773930, 104601, 761928, 0, ... 0}
but as you see the second (104601) number has 6 numbers: it must look so 0104601, and the first zero did not hatch. Through this my number looked so 7619281046017773930.

errors are different... :P

Thank you very much!
With your help,I get AC now!

Thanks a lot,at the first time I want decrease the cost of memory so I used each four digits to represent one digit，but this compression also take the number a mistake，when it should get an output for 0146，the program output an 146，it lost some digits~~~~~

THX！