why am i getting a runtime error ??
problem page:-RRSUM Problem - CodeChef
my solution:-CodeChef: Practical coding for everyone
N <= 10^9 . You can’t have an array of that size.
do you really think array[10^9] will work?
because n can be 10^9 atmost
try to solve problem another way…hint:mathematically 
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thnx man for pointing it to mathematicis 