Compilare: user.cpp: In function ‘int memo(int, int)’: user.cpp:36:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[nod].size(); ++i) { ^ user.cpp: In function ‘int main()’: user.cpp:62:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[0].size(); ++i) ^ user.cpp:47:15: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, c, a, b; ^ user.cpp:47:27: warning: unused variable ‘a’ [-Wunused-variable] int n, m, i, j, x, y, c, a, b; ^ user.cpp:47:30: warning: unused variable ‘b’ [-Wunused-variable] int n, m, i, j, x, y, c, a, b; ^