Compilare: user.cpp: In function ‘void Fail()’: user.cpp:82:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < failure->out.size(); ++ j) ^ user.cpp: In function ‘void Out()’: user.cpp:108:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < st->out.size(); ++ j) ^ user.cpp: In function ‘int main()’: user.cpp:115:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(Txt); ^ user.cpp:116:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &n); ^ user.cpp:120:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(Word); ^ /tmp/ccZAv0AV.o: In function `main': user.cpp:(.text.startup+0x1f): warning: the `gets' function is dangerous and should not be used.