Compilare: user.cpp: In function ‘int defeu(int)’: user.cpp:41:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:107:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i<=n;++i) ^ user.cpp:125:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n+1;i<2*n;++i) ^ user.cpp:143:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n+1;i<2*n;++i) ^ user.cpp:149:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^