이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
const int nmax=2e5+42;
int n,x,inp[nmax];
int tree[4*nmax];
void update(int node,int l,int r,int pos,int val)
{
if(l==r)
{
tree[node]=val;
return;
}
int av=(l+r)/2;
if(pos<=av)update(node*2,l,av,pos,val);
else update(node*2+1,av+1,r,pos,val);
tree[node]=max(tree[node*2],tree[node*2+1]);
}
int query(int node,int l,int r,int lq,int rq)
{
if(l==lq&&r==rq)return tree[node];
int av=(l+r)/2,ret=0;
if(lq<=av)ret=max(ret,query(node*2,l,av,lq,min(av,rq)));
if(av<rq)ret=max(ret,query(node*2+1,av+1,r,max(av+1,lq),rq));
return ret;
}
int sorted_inp[nmax];
int longest_to_end[nmax];
int main()
{
scanf("%i%i",&n,&x);
for(int i=1;i<=n;i++)
{
scanf("%i",&inp[i]);
sorted_inp[i]=inp[i];
}
sort(sorted_inp+1,sorted_inp+n+1);
int output=0;
for(int i=n;i>=1;i--)
{
int pos_up=upper_bound(sorted_inp+1,sorted_inp+n+1,inp[i])-sorted_inp;
int pos_low=lower_bound(sorted_inp+1,sorted_inp+n+1,inp[i])-sorted_inp;
if(pos_up<=n)longest_to_end[i]=query(1,1,n,pos_up,n);
longest_to_end[i]++;
output=max(output,longest_to_end[i]);
update(1,1,n,pos_low,longest_to_end[i]);
//cout<<i<<" -> "<<longest_to_end[i]<<endl;
}
for(int i=0;i<4*nmax;i++)tree[i]=0;
for(int i=1;i<=n;i++)
{
//try to add
int pos_add=lower_bound(sorted_inp+1,sorted_inp+n+1,inp[i]+x)-sorted_inp;
pos_add--;
if(pos_add)
{
output=max(output,query(1,1,n,1,pos_add)+longest_to_end[i]);
//cout<<i<<" -> "<<query(1,1,n,1,pos_add)<<" "<<longest_to_end[i]<<endl;
}
int pos=lower_bound(sorted_inp+1,sorted_inp+n+1,inp[i])-sorted_inp;
pos--;
int current=0;
if(pos)current=query(1,1,n,1,pos);
current++;
pos++;
update(1,1,n,pos,current);
}
printf("%i\n",output);
return 0;
}
컴파일 시 표준 에러 (stderr) 메시지
glo.cpp: In function 'int main()':
glo.cpp:39:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%i%i",&n,&x);
~~~~~^~~~~~~~~~~~~~
glo.cpp:43:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%i",&inp[i]);
~~~~~^~~~~~~~~~~~~~
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