Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:14:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[node].size(); i++) ^ user.cpp:24:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < g[node].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:49:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[i].size() == r) ^ user.cpp:51:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < v[i].size(); j++) ^ user.cpp:52:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (v[v[i][j]].size() == r) ^ user.cpp:46:9: warning: unused variable ‘k’ [-Wunused-variable] int k = 0; ^