Compilare: user.cpp: In lambda function: user.cpp:93:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[x].size(); j++) { ^ user.cpp:100:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < G[y].size(); j++) { ^ user.cpp: In lambda function: user.cpp:123:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int ii = 0; ii < G[node].size(); ii++) { ^ user.cpp: In function ‘int main()’: user.cpp:86:7: warning: unused variable ‘prevI’ [-Wunused-variable] int prevI; ^