Compilare: main.cpp: In function 'int main()': main.cpp:49:34: warning: 'min_index' may be used uninitialized in this function [-Wmaybe-uninitialized] 49 | key[j] = distance(vertices[min_index].first.first, vertices[min_index].first.second, vertices[j].first.first, vertices[j].first.second); | ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~