Compilare: main.cpp: In function 'int main()': main.cpp:71:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges.size(); ++i) { ~~^~~~~~~~~~~~~~ main.cpp:78:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < edges.size(); ++i) if(used[i] == false) sol -= edges[i].w; ~~^~~~~~~~~~~~~~