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Hi!
I just learned to implement suffix array. I got quite confused about why i need to add a terminating character to my input string such as a '$' or '#'. I tried solving problem without the terminating character, some got accepted, some got WA. Any comments? Thank you so much!
FYI, i learned suffix array from CP 3 by Steven and Felix Halim.
It depends on implementation, but string like 'aaaaa' can lead comparison over the string.
Your algorithm may be sorting not suffixes but cycle-shifts so adding some character which has less value than the others solves the problem :)