Compilare: user.cpp: In function ‘int Query(const int&, const int&)’: user.cpp:123:29: warning: suggest parentheses around arithmetic in operand of ‘|’ [-Wparentheses] left = pathParent[(idx[x] & ~kMask | (kMask + 1)) - 1]; ^ user.cpp:130:30: warning: suggest parentheses around arithmetic in operand of ‘|’ [-Wparentheses] right = pathParent[(idx[y] & ~kMask | (kMask + 1)) - 1]; ^ user.cpp: In function ‘int main()’: user.cpp:136:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.in", "r", stdin); ^ user.cpp:137:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lca.out", "w", stdout); ^ user.cpp: In function ‘char GetChar()’: user.cpp:14:34: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BUFFSIZE, stdin); ^