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/*
Challenge 201
Task 2: Penny Piles
Submitted by: Robbie Hatley
You are given an integer, $n > 0.
Write a script to determine the number of ways of putting $n pennies in a row
of piles of ascending heights from left to right.
Example
Input: $n = 5
Output: 7
Since $n=5, there are 7 ways of stacking 5 pennies in ascending piles:
1 1 1 1 1
1 1 1 2
1 2 2
1 1 3
2 3
1 4
5
*/
#include <stdio.h>
#include <stdlib.h>
int make_piles1(int prev, int n) {
int count = 0;
if (n == 0)
count++;
else if (n > 0) {
int max = (prev < 0) ? n : prev;
for (int i = 1; i <= max; i++)
count += make_piles1(i, n-i);
}
return count;
}
int make_piles(int n) {
return make_piles1(-1, n);
}
int main(int argc, char* argv[]) {
if (argc != 2) {
fputs("usage: ch-2 N", stderr);
exit(EXIT_FAILURE);
}
printf("%d\n", make_piles(atoi(argv[1])));
}
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