Compilare: main.cpp: In function 'int apm_kruskal()': main.cpp:63:23: 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:78:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:87:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~ main.cpp:99:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < sz; i++) ~~^~~~