Compilare: main.cpp: In function 'int main()': main.cpp:30:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<sol[i].size(); j++) ~^~~~~~~~~~~~~~ main.cpp: In function 'void citire()': main.cpp:39:11: warning: unused variable 'j' [-Wunused-variable] int i,j,x,y; ^ main.cpp: In function 'void dfs(int)': main.cpp:56:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<g[k].size(); i++) ~^~~~~~~~~~~~