Compilare: main.cpp: In function 'std::vector<int> shortest_path_Dijkstra(const std::vector<std::vector<std::pair<int, int> > >&, int)': main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < graph[act.first].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < dist.size(); i++) { ~~^~~~~~~~~~~~~ main.cpp:50:15: warning: unused variable 'start' [-Wunused-variable] int n, m, start; ^~~~~