Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:38:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[Nod].size(); ++i) ^ user.cpp: In function ‘void dfs2(int)’: user.cpp:47:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < b[Nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:83:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < Sol[i].size(); ++j) ^ user.cpp:57:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("retele.out", "w", stdout); ^