text: Store sums ( a + b ) of all pairs ( a , b ) in a hash table
code: for ( let i = 0 ; i < n - 1 ; i ++ ) { for ( let j = i + 1 ; j < n ; j ++ ) { map . set ( arr [ i ] + arr [ j ] , new Indexes ( i , j ) ) ; } } let d = Number . MIN_VALUE ;