I am able to solve this problem with 50 points.
How to remove Runtime error(SIGSEGV) in this problem?
the array you are creating is too large!
I believe your array named b and c can be as large as 10^10 which is not allowed (not possible because of memory limit)!
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For last subtask maximum value of n is 10^5 therefore (n*(n+1))/2 will be of order 10^10.
You are declaring an array c[si] where si = (n*(n+1))/2
Therefore size of array c is of order 10^10
The maximum value of size of an array is 10^7.
Therefore it results in runtime error for last subtask.
How to remove it ? You have to change your algorithm 
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