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output: abc
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http://www.bxmy.org/combi/hbr_combination.hpp
ºÜ¸ßÐËżµÄÍøÖ·±»ÌùÉÏÁË£¬²»¹ýÕâÎÊÌâÆäʵÊÇ <algorithm> std::next_permutation() ¿ÉÒÔ×öµ½µÄÊÂÇ飬¶ø²»ÊÇ combination¡£ÅÅÁУ¬²»ÊÇ×éºÏ¡¡
¼ÙÉèµ¥´ÊΪ std::string word;
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std::vector <char> new_word(word.begin(), word.end());
std::sort(new_word.begin(), new_word.end());
do
{
printf ("one word: %s\n", std::string(new_word.begin(), new_word.end()).c_str());
}
while (std::next_permutation(new_word.begin(), new_word.end());
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execl("/opt/java1.5/bin/java","MyClass",NULL);
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