public static void main ( String [ ] args ) {
  int arr [ ] = {
    1 , 1 , 2 , 3 };
    int n = arr . length ;
    int p_arr [ ] = new int [ n ] ;
    prefixSum ( p_arr , arr , n ) ;
    HashSet < Integer > q = new HashSet < > ( ) ;
    qPrefixSum ( p_arr , n , q ) ;
    canDivide ( p_arr , n , q , 0 , 1 ) ;
    canDivide ( p_arr , n , q , 1 , 3 ) ;
    canDivide ( p_arr , n , q , 1 , 2 ) ;
  }
  
public static void main ( String [ ] args ) { int arr [ ] = { 1 , 1 , 2 , 3 } ; int n = arr . length ; int p_arr [ ] = new int [ n ] ; prefixSum ( p_arr , arr , n ) ; HashSet < Integer > q = new HashSet < > ( ) ; qPrefixSum ( p_arr , n , q ) ; canDivide ( p_arr , n , q , 0 , 1 ) ; canDivide ( p_arr , n , q , 1 , 3 ) ; canDivide ( p_arr , n , q , 1 , 2 ) ; }
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