Compilare: user.cpp: In function ‘void ijos(int)’: user.cpp:18: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void dsus(int)’: user.cpp:34: warning: comparison between signed and unsigned integer expressions user.cpp:38: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result