Language: C++

#include<bits/stdc++.h>
using namespace std;
int h[200001];
long long t[600001];
long long query(int index,int lb,int rb,int lq,int rq)
{
	if((lb==lq&&rb==rq)||lb==rb)
		return t[index];
	int mid=(lb+rb)/2;
	long long maxn=0;
	if(rq<=mid)
		maxn=max(maxn,query(index*2,lb,mid,lq,mid));
	else if(lq>mid)
		maxn=max(maxn,query(index*2+1,mid+1,rb,mid+1,rq));
	else
	{
		maxn=max(maxn,query(index*2,lb,mid,lq,mid));
		maxn=max(maxn,query(index*2+1,mid+1,rb,mid+1,rq));
	}
	return maxn;
}
void update(int index,int lb,int rb,int id,int value)
{
	if(lb==rb&&index==id)
		t[index]=max(t[index],value);
	int mid=(lb+rb)/2;
	if(id<=mid)
	{
		update(index*2,lb,mid,id,value);
		t[index]=max(t[index],t[index*2]);
	}
	else
	{
		update(index*2+1,mid+1,rb,id,value);
		t[index]=max(t[index],t[index*2+1]);
	}
}
int main()
{
	int n,i,tmp;
	scanf("%d",&n);
	for(i=1;i<=n;i++)
	{
		scanf("%d",&h[i]);
	}
	for(i=1;i<=n;i++)
	{
		scanf("%d",&tmp);
		update(1,1,n,h[i],query(1,1,n,1,h[i]-1)+a);
	}
	printf("%lld",t[1]);
	return 0;
}

Compiler output:
a.cc: In function 'void update(int, int, int, int, int)':
a.cc:25:29: error: no matching function for call to 'max(long long int&, int&)'
   25 |                 t[index]=max(t[index],value);
      |                          ~~~^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:25:29: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   25 |                 t[index]=max(t[index],value);
      |                          ~~~^~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:25:29: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   25 |                 t[index]=max(t[index],value);
      |                          ~~~^~~~~~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:49:57: error: 'a' was not declared in this scope
   49 |                 update(1,1,n,h[i],query(1,1,n,1,h[i]-1)+a);
      |                                                         ^