Compilare: main.cpp: In function 'int apm_kruskal()': main.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) ~~^~~~ main.cpp:58:23: 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:76:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:100:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < m; j++) ~~^~~