Compilare: main.cpp: In function 'int main()': main.cpp:33:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = 0; j < v[i].size(); j++) ~~^~~~~~~~~~~~~ main.cpp:43:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i < bfs.size(); i++) { ~~^~~~~~~~~~~~ main.cpp:46:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i == bfs.size() - 1 || dist[bfs[i]] != dist[bfs[i + 1]]) ~~^~~~~~~~~~~~~~~~~ main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < bfs.size() && dist[bfs[i]] == dist[bfs[i + 1]]) ~~^~~~~~~~~~~~ main.cpp:55:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); i++) ~~^~~~~~~~~~~~