Spp recursive sequence

#1

my solutiion is giving correct output for given test case and i have checked it so many times such that now i am unable to debug it.
please help with it as it is giving wa in some test cases

#2

my code https://ide.codingblocks.com/s/245859

#3

Dry run your code for the input:
1
1 1
1 1 1000000000000000000 1234567
Desired output should be 532900
output from your code is 532899

#4

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