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401D.cpp
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93 lines (85 loc) · 1.74 KB
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#include <bits/stdc++.h>
#define int long long
using namespace std;
const int mod = 1e9+7;
const int mx = 1e7+2;
const int INF = 1e18;
int fact[mx];
int binpow(int a,int n)
{
if(!n) return 1;
if(n==1) return a;
if(n%2==1) return a*binpow(a,n-1);
else
{
int t = binpow(a,n/2);
return t*t;
}
}
int inverse(int x)
{
return binpow(x,mod-2);
}
int div_mod(int a, int b)
{
return a*inverse(b)%mod;
}
int cnk(int n, int k)
{
if(n<k) return 0;
return div_mod(fact[n],fact[k]*fact[n-k]%mod);
}
int gcd(int a, int b)
{
if(!b)return a;
return gcd(b,a%b);
}
int sum(int l, int r,vector<int>&a)
{
if(l > r) return 0;
if(!l) return a[r];
return (a[r]-a[l-1]+mod)%mod;
}
main()
{
string s;
cin >> s;
int m,n = s.size();
cin >> m;
vector<int> a;
vector<vector<int> > dp((1<<n),vector<int>(m,0));
vector<bool> mp((1<<n),0);
vector<int> cnt(10,0);
for(int i = 0; i < s.size(); i++)
{
int x=s[i]-'0';
a.push_back(x);
}
int x = 1;
for(int i = 0; i < 19; i++) {
mp[x]=1;
x=x*2;
if(x>=mp.size())break;
}
dp[0][0]=1;
for(int mask = 1; mask < (1<<n); mask++)
{
for(int i = 0; i < n; i++)
{
if (!((mask >> i) & 1) || (mp[mask] && !a[i])) continue;
int new_mask = mask ^ (1<<i);
for(int j = 0; j < m; j++)
{
dp[mask][(j*10+a[i])%m] += dp[new_mask][j];
}
}
}
int ans = dp[(1<<n)-1][0];
vector<int> fact(n+1,1);
for(int i = 2; i <= n; i++) fact[i] = fact[i-1]*i;
for(int i = 0; i < n; i++) {
cnt[a[i]]++;
}
for(int i = 0; i < 10; i++) ans = ans/fact[cnt[i]];
cout << ans;
}