Compilare: user.cpp: In function ‘int main()’: user.cpp:11:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "subsecvente.in", "r", stdin ); ^ user.cpp:13:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( s1 ); ^ user.cpp:14:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets( s2 ); ^ /tmp/ccfxEFE5.o: In function `main': user.cpp:(.text.startup+0x36): warning: the `gets' function is dangerous and should not be used.