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45 lines
812 B

2 years ago
#include <iostream>
using namespace std;
/**
3 0
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155 165 157
4
*/
int n, k;
const int N = 110;
int a[N], b[N];
int cnt;
int st[N];
void dfs(int u, int s) {
if (u == n + 1) {
cnt++;
return;
}
for (int i = 1; i <= n; i++) {
if (!st[i]) {
if (a[u] >= b[i]) {
st[i] = 1;
dfs(u + 1, s);
st[i] = 0;
}
if (a[u] < b[i] && s < k) {
st[i] = 1;
dfs(u + 1, s + 1);
st[i] = 0;
}
}
}
}
int main() {
cin >> n >> k;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++) cin >> b[i];
dfs(1, 0);
printf("%d\n", cnt);
return 0;
}