Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:12:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[nod].size(); i++) ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0; j<v[i].size(); j++) ~^~~~~~~~~~~~ main.cpp:45:18: warning: operation on 'x' may be undefined [-Wsequence-point] x=x=val[1]-val[i]; ~^~~~~~~~~~~~~~~~ main.cpp:69:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();i++) ~^~~~~~~~~~~