Problem #1036 I've already got some help, Thanks :)
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You are not initialising ar[i][j]=0. Since you are declaring the array inside your main function, the initial values might be garbage. So start with declaring long long ar[51][1001]; as a global array or set ar[i][j]=0 inside your loop
It doesn't work
See SamanSami's comment.I looked at the forum for the problem, The answer can be so big that it won't fit in long long.
The answer might not fit in long long.
Hi, SamanSami is right, I tried here with ull and got WA on test case #8, then I changed to bignum and got accepted.
Use BigInteger....