Compilare: main.cpp: In function 'void dijkstra()': main.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<v[p.first].size();++i) ~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:7: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:55:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' v[b].push_back({0,a}); ^