Compilare: user.cpp: In function ‘bool dfs(int)’: user.cpp:20:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < adj[nod].size(); i++) ^ user.cpp: In function ‘void aranjare()’: user.cpp:38:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < adj[i].size(); j++) ^ user.cpp: In function ‘int main()’: user.cpp:99:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol[len].size(); j++) ^ user.cpp:119:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol[len].size(); j++) ^ user.cpp:132:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < sol[i].size(); j++) ^