Compilare: user.cpp: In function ‘int dfs(int)’: user.cpp:20:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ^ user.cpp: In function ‘void diam(int)’: user.cpp:36:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:51:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < n; i++) ^ user.cpp:59:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i++) ^ user.cpp:62:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i++) ^ user.cpp:65:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; i++) ^