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.
Input
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).
Output
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.
Example
Input:
3
1 2
2 3
3 4
Output:
1 55
2 220
3 715
hide comments
shahayush457:
2020-04-08 21:37:43
Easy one :) |
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lnxdx:
2019-10-04 15:25:20
AC in three goes :\ |
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dkkv0000:
2019-05-11 11:31:31
excellent problem must do for beginners like me took 3hrs but worth it |
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sauravraj62:
2018-11-10 06:03:31
why so weird output format... it costs 2 WA!!! |
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jmr99:
2018-10-30 08:43:20
1.'spoiler' will do the job
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ankit1cool:
2018-06-14 14:39:54
Remember to use long long costed me 1wa |
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spojabhi:
2017-12-17 17:18:10
"OEIS" best site for getting sequences.
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vishesh197:
2017-09-26 15:04:03
simple problem.... just use dp and long long and state of dp as dp(last digit chosen,number of digits).AC in 1st go... |
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code_aim:
2017-09-04 15:52:59
100th |
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quantic:
2017-07-01 18:27:51
wow.. a good combinatorics problem!.. pure maths :) |
Added by: | John Mario |
Date: | 2011-03-22 |
Time limit: | 1s |
Source limit: | 50000B |
Memory limit: | 1536MB |
Cluster: | Cube (Intel G860) |
Languages: | All except: ASM64 |
Resource: | ACM Greater New York Regionals 2010 |