Compilare: main.cpp: In function 'int main()': main.cpp:93:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[fort[i]].size(); j++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:129:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < G[gigel.second.first].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~