Compilare: main.cpp: In function 'int main()': main.cpp:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:40:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) { ~~^~~~ main.cpp:41:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(dist[i] != 0 || i == first_node) g<<dist[i]<<" "; ~~^~~~~~~~~~~~~