Compilare: user.cpp: In function ‘int cb(int)’: user.cpp:148: warning: array subscript has type ‘char’ user.cpp:194: warning: array subscript has type ‘char’ user.cpp: In function ‘int main()’: user.cpp:210: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:211: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:212: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result /tmp/ccwFHg2p.o: In function `main': user.cpp:(.text+0xe43): warning: the `gets' function is dangerous and should not be used.