Compilare: user.cpp: In function ‘int pat(int, int&)’: user.cpp:20: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int rot(int, int&)’: user.cpp:63: warning: comparison between signed and unsigned integer expressions user.cpp:96: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:117: warning: comparison between signed and unsigned integer expressions user.cpp:114: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:115: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result