Compilare: main.cpp: In function 'void apm_kruskal()': main.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~ main.cpp:56:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp: In function 'int main()': main.cpp:75:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:98:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (index < v.size() && v[index].cost < cost) ~~~~~~^~~~~~~~~~