Compilare: main.cpp: In function 'int main()': main.cpp:41:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int z = 0; z < sume[k%nr_prim].size() && ok == 1; z++ ){ ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < sume.size(); i++ ){ ~~^~~~~~~~~~~~~ main.cpp:59:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int j = 0; j < sume[i].size(); j++ ){ ~~^~~~~~~~~~~~~~~~