Compilare: user.cpp: In function ‘unsigned int p3(int)’: user.cpp:13: warning: array subscript has type ‘char’ user.cpp:9: warning: unused variable ‘i’ user.cpp: In function ‘long long int p5(int)’: user.cpp:25: warning: array subscript has type ‘char’ user.cpp:20: warning: unused variable ‘i’ user.cpp: In function ‘int main()’: user.cpp:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result