Compilare: main.cpp: In function 'void puteri_nrprime()': main.cpp:51:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size(); ++i){ ~~^~~~~~~~~~ main.cpp: In function 'void back1(int, int)': main.cpp:100:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = a[sum_puteri - 1] + 1; i < v.size(); ++i){ ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:118:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < rez.size(); ++i){ ~~^~~~~~~~~~~~