Compilare: main.cpp: In function 'void MST()': main.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < graph.size(); i++){ ~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:94:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < solution.size(); i++){ ~~^~~~~~~~~~~~~~~~~