Answer Posted / raghvendra

1) Assuming the data in 2 dim array. (2 Columns: FROM
destination & TO destination)
2) Sort the array (any standard sorting logic) using column
1 i.e. FROM destination.
3) Take "TO" destination value of row 1 and use binary
search to search its match in "FROM" destination column
from row 2 to n
If match found, adjust that row as row 2. (Swap
pointers in place of physical data)
Take "TO" destination value of row 2 and
use binary search to search its match in "FROM" destination
column from row 3 to n
continue this logic till as long as a match
is found.

if match not found.
Resort the remaining unadjusted rows
using "TO destination" column.
Take "From" destination value of
row 1 and use binary search to search its match in "To"
column in all unadjusted rows.
Match must be found otherwise data
incorrect. adjust that row as row -1. (Swap pointers in
place of physical data)
Continue this till end of the
array.

Now you have the sorted list.


I am sure there can better ways to achieve the same.

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