JZ高中OJ 6274. [NOIP提高组模拟1]梦境

input:dream.in output:dream.out

Time Limits:  1000 ms  Memory Limits: 262144 KB  Detailed Limits  

Description

 

Input

Output

 

Sample Input

2 2
1 3
2 4
1
3

Sample Output

2

 

Data Constraint

 

Hint

 1 #include<bits/stdc++.h>
 2 using namespace std;
 3 struct A
 4 {
 5 long l,r;
 6 bool operator < (A w) const
 7 {
 8  return r>w.r;
 9 }
10 }b[200010];
11 priority_queue<A>q;
12 long n,m,a[200010],now=1,tot=0,ans=0;
13 bool ss (A t1,A t2)
14 {
15  return t1.l<t2.l;
16 }
17 int main()
18 {
19  freopen("dream.in","r",stdin);
20  freopen("dream.out","w",stdout);
21  scanf("%ld %ld",&n,&m);
22  for(int i=1;i<=n;i++) scanf("%ld %ld",&b[i].l,&b[i].r);
23  for(int i=1;i<=m;i++) scanf("%ld",&a[i]);
24  sort(b+1,b+n+1,ss);
25  sort(a+1,a+m+1);
26  for(int i=1;i<=m;i++)
27  {
28  while(b[now].l<=a[i])
29  {
30   q.push(b[now]);
31   now++;tot++;
32  }
33  if(!tot) continue;
34  A tmp=q.top();q.pop();
35  tot--;
36  while(tmp.r<a[i]&&tot)
37   {
38    tmp=q.top();q.pop();tot--;
39   }
40  if(tmp.r>=a[i]) ans++;
41  }
42  printf("%ld",ans);
43  return 0;
44 }