Compilare: user.cpp: In function ‘void hashInsert(const int&)’: user.cpp:16:9: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] H[x & Lch].push_back(x); ^ user.cpp: In function ‘int hashFind(const int&)’: user.cpp:21:17: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] int key = x & Lch; ^ user.cpp:24:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < H[key].size(); i ++) ^ user.cpp: In function ‘void hashErase(const int&)’: user.cpp:36:17: warning: suggest parentheses around ‘-’ in operand of ‘&’ [-Wparentheses] int key = x & Lch; ^ user.cpp:38:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < H[key].size(); i ++) ^ user.cpp: In function ‘void DFS(const int&, const int&)’: user.cpp:55:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < L[node].size(); i ++) ^