Compilare: user.cpp: In function ‘void dijkstra()’: user.cpp:35:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( int i = 0; i < A[x].size(); i++) { ^ user.cpp: In function ‘int main()’: user.cpp:57:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, x, y, d; ^ user.cpp:57:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, x, y, d; ^