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i want to delete my codeforces account ,how to do it ....I didn't find any link in setting.

recently there was a question to make program by solving the sequence-pattern given in input and output... please try to find it ,and help me if you can .... for every two integer input ,an output was given:

input
(1 4)
(2 3)
(4 10)
(7 10)
(8 100)
(200 300 )
(255 275)
output 5 5 12 7 1043 4048 1060

respectively how can input and output be related here, to each other????

edit : i would like to thank about_30_ninjas for his message ,thanks for solving it .

thanks for all of your answers ..... now i am removing this blog as i am getting downvotes ... (already at -39 contribution)