Compilare: user.cpp: In function ‘int main()’: user.cpp:20: warning: format ‘%I64d’ expects type ‘int’, but argument 2 has type ‘long long unsigned int’ user.cpp:9: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:10: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:11: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:15: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/cc1QKOiC.o: In function `main': user.cpp:(.text+0xa2): warning: the `gets' function is dangerous and should not be used.