Compilare: user.cpp: In function ‘int main()’: user.cpp:27:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (stiva.size() + (N - i) <= M); ^ user.cpp:32:55: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(stiva.empty() || stiva.size() == M - (N-i) ) ^ user.cpp:20:7: warning: unused variable ‘j’ [-Wunused-variable] int j,poz_max,i=0; ^ user.cpp:20:9: warning: unused variable ‘poz_max’ [-Wunused-variable] int j,poz_max,i=0; ^