Compilare: user.cpp: In function 'void DF(int)': user.cpp:29: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void DFT(int)': user.cpp:39: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void COMP(int)': user.cpp:66: warning: comparison between signed and unsigned integer expressions user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int main()': user.cpp:126: warning: comparison between signed and unsigned integer expressions user.cpp:146: warning: comparison between signed and unsigned integer expressions user.cpp:159: warning: comparison between signed and unsigned integer expressions