Compilare: user.cpp: In function ‘int main()’: user.cpp:82:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < v[1].size(); ++i) ^ user.cpp:97:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < v[x].size(); ++j) ^ user.cpp:108:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < toBeAdded.size(); ++j) ^ user.cpp:69:12: warning: unused variable ‘k’ [-Wunused-variable] int n, m, k, i, x, y, c, nr, j; ^ user.cpp:69:27: warning: unused variable ‘nr’ [-Wunused-variable] int n, m, k, i, x, y, c, nr, j; ^