static int countEvenSum ( int arr [ ] , int n ) {
  int temp [ ] = {
    1 , 0 };
    int result = 0 , sum = 0 ;
    for ( int i = 0 ;
    i <= n - 1 ;
    i ++ ) {
      sum = ( ( sum + arr [ i ] ) % 2 + 2 ) % 2 ;
      temp [ sum ] ++ ;
    }
    result = result + ( temp [ 0 ] * ( temp [ 0 ] - 1 ) / 2 ) ;
    result = result + ( temp [ 1 ] * ( temp [ 1 ] - 1 ) / 2 ) ;
    return ( result ) ;
  }
  
static int countEvenSum ( int arr [ ] , int n ) { int temp [ ] = { 1 , 0 } ; int result = 0 , sum = 0 ; for ( int i = 0 ; i <= n - 1 ; i ++ ) { sum = ( ( sum + arr [ i ] ) % 2 + 2 ) % 2 ; temp [ sum ] ++ ; } result = result + ( temp [ 0 ] * ( temp [ 0 ] - 1 ) / 2 ) ; result = result + ( temp [ 1 ] * ( temp [ 1 ] - 1 ) / 2 ) ; return ( result ) ; }
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