Compilare: user.cpp: In function ‘void dfs(int, int)’: user.cpp:27:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<g[x].size(); i++) ^ user.cpp:28:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(g[x][i]!=parent) ^ user.cpp: In function ‘int main()’: user.cpp:54:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<sol[i].size(); j++) ^