static void addEdge ( Vector < Integer > [ ] adj , int u , int v , int k ) {
  if ( u > k && v > k ) {
    adj [ u ] . add ( v ) ;
    adj [ v ] . add ( u ) ;
  }
}

static void addEdge ( Vector < Integer > [ ] adj , int u , int v , int k ) { if ( u > k && v > k ) { adj [ u ] . add ( v ) ; adj [ v ] . add ( u ) ; } }
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