Compilare: main.cpp: In function 'void dfs(int, int, int)': main.cpp:34:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(i = 0; i < v[nod].size(); i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:18: warning: 'n' is used uninitialized [-Wuninitialized] 47 | for(i = 1; i <= n; i++) | ~~^~~~ main.cpp:46:9: note: 'n' was declared here 46 | int n,a,b,i; | ^