Compilare: main.cpp: In function 'int edge(int, int)': main.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | if (v[a][i].first == b) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:56:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | int cost = d[x] + edge(x, v[x][i].first); | ~^~~~~~~~~~~~ main.cpp:43:33: warning: unused variable 'dx' [-Wunused-variable] 43 | q.pop(); | ^