一本通 1293：买书

买书

货币系统的简化版，注意特判0。

#include <iostream>
#include <cstdio>
using namespace std;
//Mystery_Sky
//
#define ll long long
#define M 10000
int v, m;
ll c[M], f[M];
int main() {
	scanf("%d", &v);
	c[1] = 10, c[2] = 20, c[3] = 50, c[4] = 100;
	f[0] = 1;
	if(v == 0) {
		printf("0\n");
		return 0;
	}
	for(int i = 1; i <= 4; i++)
		for(int j = c[i]; j <= v; j++)
			f[j] += f[j-c[i]];
	printf("%lld\n", f[v]);
	return 0;
}