http://www.codechef.com/viewsolution/3659313 My code was able to pass all test cases except one...i used the sum=k/2(2a+(k-1)d) logic to find first term ... can u tell me why this logic has failed?(see the submissions...)
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http://www.codechef.com/viewsolution/3659313 My code was able to pass all test cases except one...i used the sum=k/2(2a+(k-1)d) logic to find first term ... can u tell me why this logic has failed?(see the submissions...)