Compilare: main.cpp: In function 'int main()': main.cpp:98:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<child>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 98 | for (int i = 0; i < adj[u].size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp:106:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<child>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int i = 0; i < adj[v].size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp:111:23: warning: 'doi' may be used uninitialized [-Wmaybe-uninitialized] 111 | adj[v][doi].w = w; | ^ main.cpp:97:29: note: 'doi' was declared here 97 | int duplicate = -1, doi; | ^~~