Compilare: user.cpp: In function ‘int solution1()’: user.cpp:35:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edge[node].size(); ++i) ^ user.cpp: In function ‘int solution2()’: user.cpp:78:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < edge[queue_edge.first].size() && dragons[queue_edge.second] >= edge[queue_edge.first][i].second; ++i) ^