Rezwan needs the sum of entries between two positions in a growing daily log at a school fair.
What your program reads
Line1: N. Line2: N integers. Line3: L R.
What your program prints
Sum of a[L..R].
Limits
1 ≤ L ≤ R ≤ N ≤ 10^5
Example input
5 1 2 3 4 5 2 4
Expected output
9
main.c
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