/in/foo.cc: In function 'int main()':
/in/foo.cc:82:37: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    if( (key & kk) != key || vis[to] && (kk & lastk[to]) == kk ) 
                             ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:82:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if( (key & kk) != key || vis[to] && (kk & lastk[to]) == kk ) 
    ^~
/in/foo.cc:86:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
     if( dis[to] > kd + 1 ){
     ^~