Compilare: main.cpp: In function 'int main()': main.cpp:47:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<g[x].size();i++){ ~^~~~~~~~~~~~ main.cpp:74:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<gf[x].size();i++){ ~^~~~~~~~~~~~~