Good Digit DP problem

Правка en1, от simp_pro, 2022-08-17 09:03:54

Find number of pairs of x, y such that

1 <= x < y <= N and sumOfDigits(x) > sumOfDigits(y)

N <= 10^100 and is given as a string.

I don't remember the sign of inequality properly, it might sumOfDigits(x) < sumOfDigits(y). I read about digit DP to solve this but I cannot find any approach.

How to solve this?

Теги help, problem, solve

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en2 Английский simp_pro 2022-08-17 20:57:12 75 Tiny change: ' it might sumOfDigi' -> ' it might be sumOfDigi'
en1 Английский simp_pro 2022-08-17 09:03:54 344 Initial revision (published)