Compilare: user.cpp: In function ‘int main()’: user.cpp:42:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < ad[x].size(); i++) { ^ user.cpp:12:12: warning: unused variable ‘k’ [-Wunused-variable] int n, k, nl, q, x, y, c, dst, d2, m; ^ user.cpp:12:15: warning: unused variable ‘nl’ [-Wunused-variable] int n, k, nl, q, x, y, c, dst, d2, m; ^ user.cpp:12:19: warning: unused variable ‘q’ [-Wunused-variable] int n, k, nl, q, x, y, c, dst, d2, m; ^ user.cpp:14:15: warning: unused variable ‘sum’ [-Wunused-variable] long long sum; ^