Compilare: user.cpp: In function ‘int main()’: user.cpp:115:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < all_edges.size(); ++ i) ^ user.cpp:122:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree.size(); ++ i) ^ user.cpp:146:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < init_tree.size(); ++ j) ^ user.cpp:167:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < bucket.size(); ++ j) ^ user.cpp:170:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j = 0; j < remaining.size(); ++ j) { ^ user.cpp:178:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < tree.size(); ++ i) ^