Compilare: user.cpp: In function ‘int main()’: user.cpp:33:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=n;i<2*n;++i) ^ user.cpp:35:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(dr1 = 1;dr1<=n;++dr1) ^ user.cpp:43:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=n+1;i<2*n;++i) ^ user.cpp:46:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(coada1[st1].lu<coada1[st2].lu && st1 <=n) ^ user.cpp:58:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(coada1[st1].lu<coada1[st2].lu && st1 <=n) ^ user.cpp:85:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;++i) ^