Compilare: main.cpp: In function 'void afisare()': main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<x[i].size();j++) cout << x[i][j] << " "; ~^~~~~~~~~~~~ main.cpp: In function 'void dfs(int)': main.cpp:32:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<x[iacum].size();i++) ~^~~~~~~~~~~~~~~~ main.cpp:30:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'void prelucrare()': main.cpp:37:11: warning: unused variable 'j' [-Wunused-variable] int i,j; ^ main.cpp: In function 'int main()': main.cpp:48:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<top.size();i++) fout << top[i] << " "; ~^~~~~~~~~~~