#include <string.h> int main(int argc, const char * argv[]) { printf("去掉重复字母! LeetCode-困难 \n"); char *s ; s = removeDuplicateLetters("bcabc"); printf("bcabc 去掉重复字母:%s\n",s); s = removeDuplicateLetters("cbacdcbc"); printf("cbacdcbc 去掉重复字母:%s\n",s); ...