Compilare: main.cpp: In function 'int main()': main.cpp:19:6: warning: unused variable 'a' [-Wunused-variable] int a; ^ main.cpp: In function 'std::vector<long long int> dfs(int)': main.cpp:48:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < G[nod].size(); i++) { ~~^~~~~~~~~~~~~~~ main.cpp:65:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < levelsSum.size(); i++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp:66:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (j-1 < levelsSum[i].size()) { ~~~~^~~~~~~~~~~~~~~~~~~~~