Compilare: main.cpp: In function 'void dijkstra(unsigned int, unsigned int)': main.cpp:26:13: warning: unused variable 'd' [-Wunused-variable] int d = h.begin()->first; ^ main.cpp: In function 'int main()': main.cpp:49:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < m; i++) { ~~^~~ main.cpp:58:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 2; i <= n; ++i) { ~~^~~~