# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
669791 | sudheerays123 | Beautiful row (IZhO12_beauty) | C++17 | 96 ms | 262144 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std;
#define fast ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define ll long long int
const ll N = 20 , INF = 1e9 , MOD = 1e9+7;
ll n;
ll dp[(1ll<<21)+5][21];
ll a[21];
ll twocount(ll x){
ll s = 1;
while(s <= (x/2)) s *= 2;
ll cnt = 0;
while(x){
ll p = x/s;
x -= p*s;
if(p == 1) cnt++;
s /= 2;
}
return cnt;
}
ll threecount(ll x){
ll s = 1;
while(s <= (x/3)) s *= 3;
ll cnt = 0;
while(x){
ll p = x/s;
x -= p*s;
if(p == 1) cnt++;
s /= 3;
}
return cnt;
}
ll c2[21] , c3[21];
ll go(ll mask , ll last){
if(__builtin_popcountll(mask) == n) return 1;
if(dp[mask][last] != -1) return dp[mask][last];
ll ans = 0;
for(ll i = 1; i <= n; i++){
if(mask&(1ll<<i)) continue;
if(last == 0) ans += go(mask|(1ll<<i),i);
else if(c2[last] == c2[i] || c3[last] == c3[i]) ans += go(mask|(1ll<<i),i);
}
return dp[mask][last] = ans;
}
void solve(){
cin >> n;
for(ll i = 1; i <= n; i++){
cin >> a[i];
c2[i] = twocount(a[i]);
c3[i] = threecount(a[i]);
}
memset(dp,-1,sizeof dp);
cout << go(0,0);
}
int main(){
fast;
ll tc = 1;
// cin >> tc;
while(tc--) solve();
return 0;
}
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