Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<lista[nod].size(); i++) ^ user.cpp: In function ‘void citire()’: user.cpp:92:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0; j<strlen(c); ++j) ^ user.cpp:116:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int k=0; k<strlen(c); k++) ^