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Anybody knows why this code gives WA? It seems to work in every case I thought, it counts the words without repetition, the output is sorted...

Any help or any test case where this fails?

[cpp]
#include <iostream>
#include <string>
#include <sstream>
#include <set>

bool letras[128];

bool ...

Anybody has an idea how to do problem 10406? I don't know where to begin.

Any help would be appreciated.