NY10E - Non-Decreasing Digits
A number is said to be made up of non-decreasing digits if all the digits to the left of any digit is less than or equal to that digit.For example, the four-digit number 1234 is composed of digits that are non-decreasing. Some other four-digit numbers that are composed of non-decreasing digits are 0011, 1111, 1112, 1122, 2223. As it turns out, there are exactly 715 four-digit numbers composed of non-decreasing digits.
Notice that leading zeroes are required: 0000, 0001, 0002 are all valid four-digit numbers with non-decreasing digits.
For this problem, you will write a program that determines how many such numbers there are with a specified number of digits.
The first line of input contains a single integer P, (1 ≤ P ≤ 1000), which is the number of data sets that follow. Each data set is a single line that contains the data set number, followed by a space, followed by a decimal integer giving the number of digits N, (1 ≤ N ≤ 64).
For each data set there is one line of output. It contains the data set number followed by a single space, followed by the number of N digit values that are composed entirely of non-decreasing digits.
"OEIS" best site for getting sequences.
simple problem.... just use dp and long long and state of dp as dp(last digit chosen,number of digits).AC in 1st go...
wow.. a good combinatorics problem!.. pure maths :)
use long long !!! Happy DP :)
Easy AC in one GO..!! O(n*10) java- 0.04s
Easy dp. Just think for 20 minutes and write if you are not getting.
I'm a beginner in dp , so I do it quickly with number theory ...
Easy dp, AC IN ONE GO!
The series is the 10th row of Pascal's triangle. Too easy in number theory