Compilare: user.cpp: In function ‘void solve()’: user.cpp:24:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < v[x].size(); i++) ^ user.cpp:15:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, k, val, x; ^ user.cpp:15:15: warning: unused variable ‘k’ [-Wunused-variable] int i, j, k, val, x; ^ user.cpp: In function ‘int main()’: user.cpp:51:8: warning: ‘maxi’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<maxi; ^