#include<bits/stdc++.h>
using namespace std;
vector<int> binary[33], trinary[33];
vector<int> a;
int n;
bool same[25], block[25];
int count(int x){
int res = 0;
while(x > 0){
if(x % 3 == 1){
res++;
}
x /= 3;
}
return res;
}
map<string, bool> calc;
bool vis[(1 << 20)][21];
int solve(int i, int mask, string cur, int last){
if(i == n){
//cout << cur << '\n';
if(calc[cur])return 0;
calc[cur] = 1;
return 1;
}
int ans = 0;
if(vis[mask][last])return 0;
vis[mask][last] = 1;
if(i == 0){
for(int j = 0; j < n; j++){
int curmask = mask | (1 << j);
string tmp;
tmp += a[j] + '0';
ans += solve(i + 1, curmask, tmp, j);
}
}else{
int binaryones = __builtin_popcount(a[last]), trinaryones = count(a[last]);
for(int j = 0; j < binary[binaryones].size(); j++){
int k = binary[binaryones][j];
if(mask & (1 << k))continue;
int curmask = mask | (1 << k);
string tmp = cur;
tmp += a[k] + '0';
ans += solve(i + 1, curmask, tmp, k);
}
for(int j = 0; j < trinary[trinaryones].size(); j++){
int k = trinary[trinaryones][j];
if(mask & (1 << k))continue;
string tmp = cur;
tmp += a[k] + '0';
int curmask = mask | (1 << k);
ans += solve(i + 1, curmask, tmp, k);
}
}
return ans;
}
int main(){
cin >> n;
a.resize(n);
for(int i = 0; i < n; i++){
cin >> a[i];
int cnt3 = count(a[i]), cnt2 = __builtin_popcount(a[i]);
binary[cnt2].push_back(i);
trinary[cnt3].push_back(i);
}
cout << solve(0, 0, "", -1) << '\n';
}
Compilation message
beauty.cpp: In function 'int solve(int, int, std::__cxx11::string, int)':
beauty.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < binary[binaryones].size(); j++){
~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
beauty.cpp:49:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < trinary[trinaryones].size(); j++){
~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Incorrect |
2 ms |
256 KB |
Output isn't correct |
| 4 |
Halted |
0 ms |
0 KB |
- |
