Compilare: user.cpp: In function ‘int main()’: user.cpp:57:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[p.x].size(); i++){ ^ user.cpp:10:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, s, i, j, nv; ^