#include <bits/stdc++.h> #define bp __builtin_popcount using namespace std; inline int tp(int x){ int cnt=0; for(;x;x/=3) cnt+=(x%3==1); return cnt; } vector<int> G[20]; int N, a[20]; long long tsp[20][1048576]; void init(){ scanf("%d",&N); for(int i=0;i<N;i++){ scanf("%d",&a[i]); } for(int i=0;i<N;i++){ for(int j=i+1;j<N;j++){ if(bp(a[i])==bp(a[j])||tp(a[i])==tp(a[j])){ G[i].push_back(j); G[j].push_back(i); } } } for(int i=0;i<N;i++){ tsp[i][1<<i]=1; } } void travel(){ for(int b=1;b<(1<<N)-1;b++){ for(int i=0;i<N;i++){ for(int j : G[i]){ if((b & 1<<j) ==0){ tsp[j][b|(1<<j)]+=tsp[i][b]; } } } } } void debug(){ for(int i=0;i<N;i++,puts("")) for(int u : G[i]) printf("%d ",u); for(int i=0;i<N;i++,puts("")) for(int j=0;j<(1<<N);j++) printf("%d ",tsp[i][j]); } int main(){ init(); travel(); long long perm=0; for(int i=0;i<N;i++) perm+=tsp[i][(1<<N)-1]; printf("%lld\n",perm); //debug(); }

beauty.cpp: In function 'void debug()':
beauty.cpp:42:83: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
     for(int i=0;i<N;i++,puts("")) for(int j=0;j<(1<<N);j++) printf("%d ",tsp[i][j]);
                                                                                   ^
beauty.cpp: In function 'void init()':
beauty.cpp:13:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d",&N);
                   ^
beauty.cpp:15:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d",&a[i]);
                          ^