Compilare: main.cpp: In function 'int main()': main.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 38 | for (i = 0; i < vecini[nod].size(); ++i) | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp:19:24: warning: unused variable 'j' [-Wunused-variable] 19 | int n, m, x, y, i, j, a, b, c; | ^