Compilare: main.cpp: In function 'int main()': main.cpp:75:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 3; i < distances.size(); i++) ~~^~~~~~~~~~~~~~~~~~ main.cpp:50:33: warning: unused variable 'source' [-Wunused-variable] unsigned int nVertices, nArcs, source = 1; ^~~~~~ main.cpp:51:48: warning: 'nVertices' is used uninitialized in this function [-Wuninitialized] std::vector<std::vector<edge>> arcs(nVertices + 1); ~~~~~~~~~~^~~