Compilare: user.cpp: In function ‘int main()’: user.cpp:47:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < fals.size(); i++) ^ user.cpp:53:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ch.size(); i++) ^ user.cpp:18:16: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(S); ^ /tmp/cc1n8mFz.o: In function `main': user.cpp:(.text.startup+0x1c): warning: the `gets' function is dangerous and should not be used.