Submission #159084

#	Time	Username	Problem	Language	Result	Execution time	Memory
159084		TadijaSebez	Worst Reporter 2 (JOI16_worst_reporter2)	C++11	100 / 100	477 ms	148708 KiB

worst_reporter2

#include <bits/stdc++.h>
using namespace std;
const int N=200050;
int a[N],b[N],c[N],d[N];
const int M=2*N;
int mx[M],lzy[M],ls[M],rs[M],tsz,root;
void Set(int &c, int ss, int se, int qs, int qe, int f)
{
	if(qs>qe || qs>se || ss>qe) return;
	if(!c) c=++tsz;
	if(qs<=ss && qe>=se){ lzy[c]+=f;mx[c]+=f;return;}
	int mid=ss+se>>1;
	Set(ls[c],ss,mid,qs,qe,f);
	Set(rs[c],mid+1,se,qs,qe,f);
	mx[c]=max(mx[ls[c]],mx[rs[c]])+lzy[c];
}
int Get(int c, int ss, int se, int qs, int qe)
{
	if(qs<=ss && qe>=se) return mx[c];
	int mid=ss+se>>1;
	if(qe<=mid) return Get(ls[c],ss,mid,qs,qe)+lzy[c];
	if(qs>mid) return Get(rs[c],mid+1,se,qs,qe)+lzy[c];
	return max(Get(ls[c],ss,mid,qs,qe),Get(rs[c],mid+1,se,qs,qe))+lzy[c];
}
stack<int> cnt[N];
int main()
{
	int n;
	scanf("%i",&n);
	for(int i=1;i<=n;i++) scanf("%i %i",&a[i],&b[i]);
	for(int i=1;i<=n;i++) scanf("%i %i",&c[i],&d[i]);
	int ans=n;
	for(int i=n,j=n;i>=1;i--)
	{
		for(;j>=1 && b[j]<=d[i];j--)
		{
			cnt[a[j]].push(i);
			Set(root,1,n,1,i,-1);
		}
		if(cnt[c[i]].size())
		{
			int x=cnt[c[i]].top();
			if(Get(root,1,n,1,x)<0)
			{
				cnt[c[i]].pop();
				Set(root,1,n,1,x,1);
				ans--;
			}
			else Set(root,1,n,1,i,1);
		}
		else Set(root,1,n,1,i,1);
	}
	printf("%i\n",ans);
	return 0;
}

Compilation message (stderr)

worst_reporter2.cpp: In function 'void Set(int&, int, int, int, int, int)':
worst_reporter2.cpp:12:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=ss+se>>1;
          ~~^~~
worst_reporter2.cpp: In function 'int Get(int, int, int, int, int)':
worst_reporter2.cpp:20:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=ss+se>>1;
          ~~^~~
worst_reporter2.cpp: In function 'int main()':
worst_reporter2.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%i",&n);
  ~~~~~^~~~~~~~~
worst_reporter2.cpp:30:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%i %i",&a[i],&b[i]);
                        ~~~~~^~~~~~~~~~~~~~~~~~~~~
worst_reporter2.cpp:31:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  for(int i=1;i<=n;i++) scanf("%i %i",&c[i],&d[i]);
                        ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 40 / 40