Compilare: user.cpp: In function ‘int main()’: user.cpp:33:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] edges[x][y] = 1; ^ user.cpp:33:19: warning: array subscript has type ‘char’ [-Wchar-subscripts] edges[x][y] = 1; ^ user.cpp:34:12: warning: array subscript has type ‘char’ [-Wchar-subscripts] G[x].push_back(y); ^ user.cpp:35:16: warning: array subscript has type ‘char’ [-Wchar-subscripts] ++deg[y]; ^ In file included from /usr/include/c++/4.8/cassert:43:0, from /usr/include/i386-linux-gnu/c++/4.8/bits/stdc++.h:33, from user.cpp:1: user.cpp:56:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(order.size() == N); ^ user.cpp:73:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < V[len].size(); ++j) { ^ user.cpp:81:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < V[i].size(); ++j) { ^ user.cpp:95:9: warning: ‘lol’ may be used uninitialized in this function [-Wmaybe-uninitialized] int lol; ^