Submission #55007

#	Time	Username	Problem	Language	Result	Execution time	Memory
55007		radoslav11	Dancing Elephants (IOI11_elephants)	C++14	Compilation error	0 ms	0 KiB

elephants

#include <bits/stdc++.h>
#include "elephants.h"
//#include "Lgrader.cpp"

using namespace std;
template<class T, class T2> inline int chkmax(T &x, const T2 &y) { return x < y ? x = y, 1 : 0; }
template<class T, class T2> inline int chkmin(T &x, const T2 &y) { return x > y ? x = y, 1 : 0; }
const int MAXN = (1 << 20);
const int inf = (int)2e9 + 42;

random_device rd;
mt19937 mt(rd());

struct node
{
	int sum, val, sz, prior; 
	node *l, *r, *par, *pp;
	node() { l = r = par = pp = nullptr; sum = val = sz = prior = 0; }
	node(int v) { l = r = par = pp = nullptr; sum = val = v; sz = 1; prior = mt(); }
};

using pnode = node*;

pnode get_l(pnode t) { while(t->l) t = t->l; return t; }
pnode get_r(pnode t) { while(t->r) t = t->r; return t; }
pnode get_par(pnode t) { while(t->par) t = t->par; return t; }

inline int size(pnode t) { return t ? t->sz : 0; }
inline int sum(pnode t) { return t ? t->sum : 0; }

void pull(pnode &t)
{
	if(!t) return;

	t->sz = size(t->l) + size(t->r) + 1;
	t->sum = t->val + sum(t->l) + sum(t->r);
	t->par = nullptr;

	if(t->l) t->l->par = t;
	if(t->r) t->r->par = t;

	if(t->l && t->l->pp) t->pp = t->l->pp, t->l->pp = nullptr;
	if(t->r && t->r->pp) t->pp = t->r->pp, t->r->pp = nullptr;
}

void merge(pnode &t, pnode l, pnode r)
{
	if(!l) { t = r; pull(t); return; }
	if(!r) { t = l; pull(t); return; }

	if(l->prior > r->prior)
		merge(l->r, l->r, r), t = l;
	else
		merge(r->l, l, r->l), t = r;

	pull(t);
}

void split(pnode t, pnode &l, pnode &r, int k, int add = 0)
{
	if(!t) { l = nullptr; r = nullptr; return; }

	int idx = add + size(t->l);
	if(idx <= k)
		split(t->r, t->r, r, k, idx + 1), l = t;
	else
		split(t->l, l, t->l, k, add), r = t;

	pull(t);
}

pnode remove_left(pnode u)
{
	int pos = size(u->l);
	pnode root = u;

	while(root->par)
	{
		if(root->par->r == root) pos += size(root->par->l) + 1; 
		root = root->par;
	}

	pnode L, R;
	split(root, L, R, pos - 1);
	return R;
}

pnode remove_right(pnode u)
{
	int pos = size(u->l);
	pnode root = u;

	while(root->par)
	{
		if(root->par->r == root) pos += size(root->par->l) + 1; 
		root = root->par;
	}

	pnode L, R, prv_pp = root->pp;
	root->pp = nullptr;
	split(root, L, R, pos);

	if(R) R->pp = u;
	L->pp = prv_pp;

	return L;
}

pnode merge_trees(pnode l, pnode r)
{
	pnode rt;
	if(r) r->pp = nullptr;
	merge(rt, l, r);
	return rt;
}

struct link_cut_tree
{
	pnode tr[MAXN];
	void new_node(int i, int col) { tr[i] = new node(col); }

	pnode access(pnode u)
	{
		u = remove_right(u);
		while(u->pp)
		{
			pnode p = remove_right(u->pp);
			u = merge_trees(p, u);
		}

		return u;
	}

	int query(pnode u)
	{
		u = access(u);
		return sum(u);
	}

	void cut(pnode u)
	{
		access(u);
		remove_left(u);
	}

	void link(pnode w, pnode u)
	{
		w = access(w);
		u = access(u);
		merge_trees(u, w);
	}
};

link_cut_tree lct;
int n, L;
int x[MAXN];
set<pair<int, int> > st;

void update_link(set<pair<int, int> >::iterator it)
{
	if(it->second != 2 * N && (it->second & 1) == 0) return;

	pnode u = lct.tr[it->second];
	lct.cut(u);

	pnode p = lct.tr[next(it)->second];
	lct.link(u, p);
}

void init(int N, int L, int X[])
{
	n = N;
	L++;
	::L = L;	

	lct.new_node(2 * N, 0);
	lct.new_node(2 * N + 1, 0);

	st.insert({-42, 2 * N});
	st.insert({inf, 2 * N + 1});
	for(int i = 0; i < N; i++)
	{
		lct.new_node(2 * i, 1);
		lct.new_node(2 * i + 1, 0);
		lct.link(lct.tr[2 * i], lct.tr[2 * i + 1]);

		st.insert({X[i], 2 * i});
		st.insert({X[i] + L, 2 * i + 1});
	}

	for(auto it = st.begin(); it != prev(st.end()); ++it)
		update_link(it);
}

int update(int i, int y)
{
	auto it1 = st.lower_bound({X[i], 2 * i});
	auto it2 = st.lower_bound({X[i] + L, 2 * i + 1});
	//auto pr1 = prev(it1), pr2 = prev(it2);

	//bool do2 = pr2 != it1;

	st.erase(it1);
	st.erase(it2);

	//update_link(pr1);
	//if(do2) update_link(pr2);

	X[i] = y;

	it1 = st.insert({X[i], 2 * i}).first;
	it2 = st.insert({X[i] + L, 2 * i + 1}).first;

	//update_link(prev(it1));
	//update_link(prev(it2));

	//update_link(it1);
	//update_link(it2);

	for(int i = 0; i <= n; i++) 
		lct.cut(lct.tr[2 * i]), lct.cut(lct.tr[2 * i + 1]);

	for(int i = 0; i < n; i++)
		lct.link(lct.tr[2 * i], lct.tr[2 * i + 1]);

	for(auto it = st.begin(); it != prev(st.end()); ++it)
		update_link(it);
	
	return lct.query(lct.tr[2 * N]);
}

Compilation message (stderr)

elephants.cpp: In function 'void update_link(std::set<std::pair<int, int> >::iterator)':
elephants.cpp:161:23: error: 'N' was not declared in this scope
  if(it->second != 2 * N && (it->second & 1) == 0) return;
                       ^
elephants.cpp: In function 'int update(int, int)':
elephants.cpp:197:29: error: 'X' was not declared in this scope
  auto it1 = st.lower_bound({X[i], 2 * i});
                             ^
elephants.cpp:197:41: error: no matching function for call to 'std::set<std::pair<int, int> >::lower_bound(<brace-enclosed initializer list>)'
  auto it1 = st.lower_bound({X[i], 2 * i});
                                         ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:800:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::lower_bound(const key_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::key_type = std::pair<int, int>]
       lower_bound(const key_type& __x)
       ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:800:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const key_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:804:7: note: candidate: std::set<_Key, _Compare, _Alloc>::const_iterator std::set<_Key, _Compare, _Alloc>::lower_bound(const key_type&) const [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::key_type = std::pair<int, int>]
       lower_bound(const key_type& __x) const
       ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:804:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const key_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:810:2: note: candidate: template<class _Kt> decltype ((std::set<_Key, _Compare, _Alloc>::iterator)(((std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_lower_bound_tr(__x))) std::set<_Key, _Compare, _Alloc>::lower_bound(const _Kt&) [with _Kt = _Kt; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  lower_bound(const _Kt& __x)
  ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:810:2: note:   template argument deduction/substitution failed:
elephants.cpp:197:41: note:   couldn't deduce template parameter '_Kt'
  auto it1 = st.lower_bound({X[i], 2 * i});
                                         ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:816:2: note: candidate: template<class _Kt> decltype ((std::set<_Key, _Compare, _Alloc>::const_iterator)(((const std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_lower_bound_tr(__x))) std::set<_Key, _Compare, _Alloc>::lower_bound(const _Kt&) const [with _Kt = _Kt; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  lower_bound(const _Kt& __x) const
  ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:816:2: note:   template argument deduction/substitution failed:
elephants.cpp:197:41: note:   couldn't deduce template parameter '_Kt'
  auto it1 = st.lower_bound({X[i], 2 * i});
                                         ^
elephants.cpp:198:49: error: no matching function for call to 'std::set<std::pair<int, int> >::lower_bound(<brace-enclosed initializer list>)'
  auto it2 = st.lower_bound({X[i] + L, 2 * i + 1});
                                                 ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:800:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::lower_bound(const key_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::key_type = std::pair<int, int>]
       lower_bound(const key_type& __x)
       ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:800:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const key_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:804:7: note: candidate: std::set<_Key, _Compare, _Alloc>::const_iterator std::set<_Key, _Compare, _Alloc>::lower_bound(const key_type&) const [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::key_type = std::pair<int, int>]
       lower_bound(const key_type& __x) const
       ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:804:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const key_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:810:2: note: candidate: template<class _Kt> decltype ((std::set<_Key, _Compare, _Alloc>::iterator)(((std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_lower_bound_tr(__x))) std::set<_Key, _Compare, _Alloc>::lower_bound(const _Kt&) [with _Kt = _Kt; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  lower_bound(const _Kt& __x)
  ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:810:2: note:   template argument deduction/substitution failed:
elephants.cpp:198:49: note:   couldn't deduce template parameter '_Kt'
  auto it2 = st.lower_bound({X[i] + L, 2 * i + 1});
                                                 ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:816:2: note: candidate: template<class _Kt> decltype ((std::set<_Key, _Compare, _Alloc>::const_iterator)(((const std::set<_Key, _Compare, _Alloc>*)this)->std::set<_Key, _Compare, _Alloc>::_M_t._M_lower_bound_tr(__x))) std::set<_Key, _Compare, _Alloc>::lower_bound(const _Kt&) const [with _Kt = _Kt; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  lower_bound(const _Kt& __x) const
  ^~~~~~~~~~~
/usr/include/c++/7/bits/stl_set.h:816:2: note:   template argument deduction/substitution failed:
elephants.cpp:198:49: note:   couldn't deduce template parameter '_Kt'
  auto it2 = st.lower_bound({X[i] + L, 2 * i + 1});
                                                 ^
elephants.cpp:211:31: error: no matching function for call to 'std::set<std::pair<int, int> >::insert(<brace-enclosed initializer list>)'
  it1 = st.insert({X[i], 2 * i}).first;
                               ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:499:7: note: candidate: std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:499:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:508:7: note: candidate: std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:508:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::set<std::pair<int, int> >::value_type&& {aka std::pair<int, int>&&}'
/usr/include/c++/7/bits/stl_set.h:536:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::const_iterator, const value_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const_iterator __position, const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:536:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/7/bits/stl_set.h:541:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::const_iterator, std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const_iterator __position, value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:541:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/7/bits/stl_set.h:556:2: note: candidate: template<class _InputIterator> void std::set<_Key, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = _InputIterator; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  insert(_InputIterator __first, _InputIterator __last)
  ^~~~~~
/usr/include/c++/7/bits/stl_set.h:556:2: note:   template argument deduction/substitution failed:
elephants.cpp:211:31: note:   candidate expects 2 arguments, 1 provided
  it1 = st.insert({X[i], 2 * i}).first;
                               ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:568:7: note: candidate: void std::set<_Key, _Compare, _Alloc>::insert(std::initializer_list<_Tp>) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
       insert(initializer_list<value_type> __l)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:568:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::initializer_list<std::pair<int, int> >'
elephants.cpp:212:39: error: no matching function for call to 'std::set<std::pair<int, int> >::insert(<brace-enclosed initializer list>)'
  it2 = st.insert({X[i] + L, 2 * i + 1}).first;
                                       ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:499:7: note: candidate: std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(const value_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:499:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type& {aka const std::pair<int, int>&}'
/usr/include/c++/7/bits/stl_set.h:508:7: note: candidate: std::pair<typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator, bool> std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; typename std::_Rb_tree<_Key, _Key, std::_Identity<_Key>, _Compare, typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_Key>::other>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:508:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::set<std::pair<int, int> >::value_type&& {aka std::pair<int, int>&&}'
/usr/include/c++/7/bits/stl_set.h:536:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::const_iterator, const value_type&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const_iterator __position, const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:536:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/7/bits/stl_set.h:541:7: note: candidate: std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::insert(std::set<_Key, _Compare, _Alloc>::const_iterator, std::set<_Key, _Compare, _Alloc>::value_type&&) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::const_iterator = std::_Rb_tree_const_iterator<std::pair<int, int> >; std::set<_Key, _Compare, _Alloc>::value_type = std::pair<int, int>]
       insert(const_iterator __position, value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:541:7: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/7/bits/stl_set.h:556:2: note: candidate: template<class _InputIterator> void std::set<_Key, _Compare, _Alloc>::insert(_InputIterator, _InputIterator) [with _InputIterator = _InputIterator; _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
  insert(_InputIterator __first, _InputIterator __last)
  ^~~~~~
/usr/include/c++/7/bits/stl_set.h:556:2: note:   template argument deduction/substitution failed:
elephants.cpp:212:39: note:   candidate expects 2 arguments, 1 provided
  it2 = st.insert({X[i] + L, 2 * i + 1}).first;
                                       ^
In file included from /usr/include/c++/7/set:61:0,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:87,
                 from elephants.cpp:1:
/usr/include/c++/7/bits/stl_set.h:568:7: note: candidate: void std::set<_Key, _Compare, _Alloc>::insert(std::initializer_list<_Tp>) [with _Key = std::pair<int, int>; _Compare = std::less<std::pair<int, int> >; _Alloc = std::allocator<std::pair<int, int> >]
       insert(initializer_list<value_type> __l)
       ^~~~~~
/usr/include/c++/7/bits/stl_set.h:568:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::initializer_list<std::pair<int, int> >'
elephants.cpp:229:30: error: 'N' was not declared in this scope
  return lct.query(lct.tr[2 * N]);
                              ^