Compilare: user.cpp: In function ‘int solve(int, int)’: user.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<L[nod].size();i++){ ~^~~~~~~~~~~~~~ user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<sol[nod].size()-1;j++){ ~^~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:79:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0;j<L[i].size();j++) ~^~~~~~~~~~~~ user.cpp:82:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (jj=0;jj<sol[nd].size();jj++) ~~^~~~~~~~~~~~~~~