Compilare: user.cpp: In function ‘int main()’: user.cpp:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:48: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:50: warning: array subscript is below array bounds user.cpp:50: warning: ‘v’ is used uninitialized in this function