Compilare: user.cpp: In function ‘int main()’: user.cpp:45:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[x].size(); ++i) ^ user.cpp:13:15: warning: unused variable ‘nr’ [-Wunused-variable] int n, m, i, nr, test, x, y, c, maxd; ^