Compilare: main.cpp: In function 'int main()': main.cpp:157:30: warning: 'N' is used uninitialized [-Wuninitialized] 157 | vector<vector<int>> adj(N+1); | ~^~ main.cpp:154:9: note: 'N' was declared here 154 | int N, M; | ^ main.cpp:158:23: warning: 'M' may be used uninitialized [-Wmaybe-uninitialized] 158 | for (int i = 0; i < M; i++) { | ~~^~~ main.cpp:154:12: note: 'M' was declared here 154 | int N, M; | ^