Compilare: main.cpp: In function 'void dijkstra(std::vector<std::vector<std::pair<int, int> > >&, int)': main.cpp:30:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= graph.size(); i++) ~~^~~~~~~~~~~~~~~ main.cpp:33:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < graph.size(); i++) { ~~^~~~~~~~~~~~~~ main.cpp:40:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < graph[min_node].size(); j++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:52:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i < graph.size(); i++) { ~~^~~~~~~~~~~~~~