static int findElement ( int arr [ ] , int n ) {
  int [ ] prefixSum = new int [ n ] ;
  prefixSum [ 0 ] = arr [ 0 ] ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) prefixSum [ i ] = prefixSum [ i - 1 ] + arr [ i ] ;
  int [ ] suffixSum = new int [ n ] ;
  suffixSum [ n - 1 ] = arr [ n - 1 ] ;
  for ( int i = n - 2 ;
  i >= 0 ;
  i -- ) suffixSum [ i ] = suffixSum [ i + 1 ] + arr [ i ] ;
  for ( int i = 1 ;
  i < n - 1 ;
  i ++ ) if ( prefixSum [ i ] == suffixSum [ i ] ) return arr [ i ] ;
  return - 1 ;
}

static int findElement ( int arr [ ] , int n ) { int [ ] prefixSum = new int [ n ] ; prefixSum [ 0 ] = arr [ 0 ] ; for ( int i = 1 ; i < n ; i ++ ) prefixSum [ i ] = prefixSum [ i - 1 ] + arr [ i ] ; int [ ] suffixSum = new int [ n ] ; suffixSum [ n - 1 ] = arr [ n - 1 ] ; for ( int i = n - 2 ; i >= 0 ; i -- ) suffixSum [ i ] = suffixSum [ i + 1 ] + arr [ i ] ; for ( int i = 1 ; i < n - 1 ; i ++ ) if ( prefixSum [ i ] == suffixSum [ i ] ) return arr [ i ] ; return - 1 ; }
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