#include <stdio.h> #include <string.h> /*注意题干只允许开始或结尾处添加[,]*/ int add_c(char* input, char* output) { int index = 0 ; int index_ret = 0; char flg_lef = 0; int index_r = 0; int index_l = 0; for (index = 0; ; index++) { if (input[index] == '[') { if (0 == flg_lef)/*是否有左括号*/ flg_lef = 1; els...