#include <bits/stdc++.h>
using namespace std;
int n;
int nums[25];
int cnt=0;
vector<vector<int> > dp;
int slv(int msk=0,int lstidx=-1){
if(msk==(1<<n)-1){
return 1;
}
int cnt=0;
if(lstidx!=-1&&dp[msk][lstidx]!=-1)
return dp[msk][lstidx];
for(int i=0;i<n;i++){
if(!(msk&(1<<i))){
if(lstidx==-1){
cnt+=slv(msk|(1<<i),i);
continue;
}
int f=0;
{
int num1=nums[lstidx];
int num2=nums[i];
int cntb2=0;
while(num1||num2){
cntb2-=num1%2;
cntb2+=num2%2;
num1/=2;
num2/=2;
}
if(!cntb2){
f=1;
}
num1=nums[lstidx];
num2=nums[i];
int cntb3=0;
while(num1||num2){
cntb3-=num1%3==1;
cntb3+=num2%3==1;
num1/=3;
num2/=3;
}
if(!cntb3){
f=1;
}
}
if(f){
cnt+=slv(msk|(1<<i),i);
}
}
}
return dp[msk][lstidx]=cnt;
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin>>n;
for(int i=0;i<n;i++){
cin>>nums[i];
}
dp=vector<vector<int> >((1<<n)+5,vector<int>(n+5,-1));
cout<<slv();
return 0;
}
/****
1
8 4
3 1
4 3
1 8
8 7
1
100 9
1 100
2 1
3 2
4 3
5 4
100 99
99 98
98 97
97 96
19 3 6
3 12 9
2000000000 1000000000 1000000000
3 1000000000 1000000000
*/
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
1 ms |
492 KB |
Execution killed with signal 6 (could be triggered by violating memory limits) |
| 2 |
Halted |
0 ms |
0 KB |
- |
