On Ideone my code ran correctly for the first two Test Cases(Couldn't check for more):
But on Codeforces it's showing Runtime Error for the first Test Case.
Can anyone help?
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The return code of the first test of your submission suggests a stack overflow. Try using ints instead of long long ints.
I have used int everywhere.
I'm looking at http://codeforces.me/contest/983/submission/38822395
These occupy 3*5010*5010*sizeof(long long) bytes, which is approximately 574MB. But the stack size is only 256MB (see https://codeforces.me/blog/entry/79). So even if you use int instead of long long, you will need 574/2 = 287 MB, which is still to much.
Try to reuse the matrix f and use int instead of long long