why i am getting wrong answer in simple sum problem .here is my solution for third subtask my ans is showing wrong answer.detailed explaination http://ideone.com/SkihXn

Hi @rahulsup

It’s maybe an overflow issue for some big values of N

Try

1

999983

The answer is 999965000307

Your code gives 546397322511

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Power function returns double, so (p+1) is also converted to double… Try type casting (long long int)pow()

Ooops. You’re right.

bad copy paste.

Try

1

999993

Good anser is 777764555617

You code gives 777764555616