static void multiply ( int mat [ ] [ ] , int res [ ] [ ] ) {
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    for ( int j = 0 ;
    j < N ;
    j ++ ) {
      res [ i ] [ j ] = 0 ;
      for ( int k = 0 ;
      k < N ;
      k ++ ) res [ i ] [ j ] += mat [ i ] [ k ] * mat [ k ] [ j ] ;
    }
  }
}

static void multiply ( int mat [ ] [ ] , int res [ ] [ ] ) { for ( int i = 0 ; i < N ; i ++ ) { for ( int j = 0 ; j < N ; j ++ ) { res [ i ] [ j ] = 0 ; for ( int k = 0 ; k < N ; k ++ ) res [ i ] [ j ] += mat [ i ] [ k ] * mat [ k ] [ j ] ; } } }
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