Use red-black tree to write " back the word" application, based on familiarity sort of familiarity same lexicographically sorted. You can add, delete words, you can modify the familiarity of a word. You can find the k-word, or to calculate the kth word familiarity lth comprehensive.

RB_Tree_danciking\main.c
.................\pj1.txt
.................\pj2.txt
.................\RB_Tree_danciking.cbp
.................\RB_Tree_danciking.depend
.................\RB_Tree_danciking.layout
.................\bin\Debug\RB_Tree_danciking.exe
.................\obj\Debug\main.o
.................\bin\Debug
.................\obj\Debug
.................\bin
.................\obj
RB_Tree_danciking

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