Given a range [l r] find the sum of last digits of fibonacci numbers between l and r. i.e , last(fib(l))+last(fib(l+1)) .... last(fib(r)),
where last(fib(a)) denotes last digit of ath fibonacci number.
1<=l<=r<=1e9
Given a range [l r] find the sum of last digits of fibonacci numbers between l and r. i.e , last(fib(l))+last(fib(l+1)) .... last(fib(r)),
where last(fib(a)) denotes last digit of ath fibonacci number.
1<=l<=r<=1e9
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one property of fibonacci number is last digit repeats at an interval of 60 .i think this will help.
Using Pisano Period for $$$base = 10$$$ then we have $$$\pi(n) = 60$$$ numbers per cycle