Compilare: main.cpp: In function 'void bfs(int)': main.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < a[x].size(); i++) ~~^~~~~~~~~~~~~ main.cpp: In function 'std::pair<int, int> bellmanford()': main.cpp:92:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < bipartit[x].size(); i++) ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'void solve()': main.cpp:125:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < a[nodfinal].size(); j++) { ~~^~~~~~~~~~~~~~~~~~~~