Compilare: user.cpp: In function ‘int main()’: user.cpp:16:22: warning: unused variable ‘nr2’ [-Wunused-variable] long long nr1=0, nr2=0; ^ user.cpp:13:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triopalindrom.in", "r", stdin); ^ user.cpp:14:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("triopalindrom.out", "w", stdout); ^ user.cpp:17:25: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s), n=strlen(s); ^ /tmp/cc7Jkaff.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.