A14501 | Another Sorting Problem

Andi and Budi were given an assignment to tidy up their bookshelf of $n$ books. Each book is represented by the book title — a string $s_i$ numbered from $1$ to $n$ , each with length $m$ . Andi really wants to sort the book lexicographically ascending, while Budi wants to sort it lexicographically descending.

Settling their fight, they decided to combine their idea and sort it asc-desc-endingly, where the odd-indexed characters will be compared ascendingly, and the even-indexed characters will be compared descendingly.

A string $a$ occurs before a string $b$ in asc-desc-ending order if and only if in the first position where $a$ and $b$ differ, the following holds:

- if it is an odd position, the string $a$ has a letter that appears earlier in the alphabet than the corresponding letter in $b$ ;
- if it is an even position, the string $a$ has a letter that appears later in the alphabet than the corresponding letter in $b$ .

The first line contains two integers $n$ and $m$ ( $1 \leq n \cdot m \leq 10^6$ ).

The $i$ -th of the next $n$ lines contains a string $s_i$ consisting of $m$ uppercase Latin letters — the book title. The strings are pairwise distinct.

Output $n$ integers — the indices of the strings after they are sorted asc-desc-endingly.