Eroare de compilare: main.cpp: In function 'void solve(int, int)': main.cpp:47:8: error: reference to 'is_sorted' is ambiguous if(is_sorted[root] == 0) sort(g[root].begin(), g[root].end(), cmp); ^~~~~~~~~ main.cpp:43:5: note: candidates are: int is_sorted [500005] int is_sorted[500005]; ^~~~~~~~~ In file included from /usr/include/c++/6/algorithm:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:65, from main.cpp:1: /usr/include/c++/6/bits/stl_algo.h:3220:5: note: template<class _FIter, class _Compare> bool std::is_sorted(_FIter, _FIter, _Compare) is_sorted(_ForwardIterator __first, _ForwardIterator __last, ^~~~~~~~~ /usr/include/c++/6/bits/stl_algo.h:3206:5: note: template<class _FIter> bool std::is_sorted(_FIter, _FIter) is_sorted(_ForwardIterator __first, _ForwardIterator __last) ^~~~~~~~~ main.cpp:48:5: error: reference to 'is_sorted' is ambiguous is_sorted[root] = 1; ^~~~~~~~~ main.cpp:43:5: note: candidates are: int is_sorted [500005] int is_sorted[500005]; ^~~~~~~~~ In file included from /usr/include/c++/6/algorithm:62:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:65, from main.cpp:1: /usr/include/c++/6/bits/stl_algo.h:3220:5: note: template<class _FIter, class _Compare> bool std::is_sorted(_FIter, _FIter, _Compare) is_sorted(_ForwardIterator __first, _ForwardIterator __last, ^~~~~~~~~ /usr/include/c++/6/bits/stl_algo.h:3206:5: note: template<class _FIter> bool std::is_sorted(_FIter, _FIter) is_sorted(_ForwardIterator __first, _ForwardIterator __last) ^~~~~~~~~ Non zero exit status: 1