/in/foo.cc: In function 'int dp()':
/in/foo.cc:22:16: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
    if (~k&(1<<i-1)) vis[a[i][0]][a[i][1]]=1;
               ~^~
/in/foo.cc:37:15: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     if(j&(1<<k-1)) (f[i][j]+=f[i-1][j^(1<<k-1)])%=P;
              ~^~
/in/foo.cc:37:44: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
     if(j&(1<<k-1)) (f[i][j]+=f[i-1][j^(1<<k-1)])%=P;
                                           ~^~