Compilare: user.cpp: In function ‘void write()’: user.cpp:49:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < sol.size(); ++ i) ^ user.cpp: In function ‘int main()’: user.cpp:54:22: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(pattern + 1); ^ user.cpp:56:19: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(text + 1); ^ /tmp/cc5lykPy.o: In function `main': user.cpp:(.text.startup+0x19): warning: the `gets' function is dangerous and should not be used.