Compilare: main.cpp: In function 'int main()': main.cpp:32:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k = 0; k < g[j].size(); k++){ ~~^~~~~~~~~~~~~ main.cpp:41:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[0].size();i++){ ~~^~~~~~~~~~~~~