static folly::fbstring sub_string_range();

static void all_sub();

static size_t exp_n(int n);

static void string_compress();

static void string_expression();

static void find_longest_not_repeat_sub();

static void string_replace();

static void boolean_expression();

static void expression();

static void wordBreak();

static void searchWord();

static void minWindows();

// leetcode 187

static void findRepeatedDnaSequences();

static void Rabin_Karp(); // 从数组找到匹配的模式串的方法

static void printAll(const folly::fbstring &cur, size_t index, const folly::fbstring &data);