This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=a;i<b;i++)
#define fore(i,a,b) for(int i=a;i<=b;i++)
#define pb push_back
#define F first
#define S second
#define INF 2e14
#define MOD 998244353
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
#define MAXN 100005
int n,m;
ii e[MAXN];
ll f[MAXN];
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0);
cin>>n>>m;
forn(i,0,n) cin>>e[i].S>>e[i].F;
forn(i,0,m) cin>>f[i];
sort(e,e+n,greater<ii>());
sort(f,f+m,greater<ll>());
int ptr=0,ans=0;
forn(i,0,n){
if(e[i].S<=f[ptr]){
ans++;
ptr++;
}
if(ptr==m) break;
}
cout<<ans<<'\n';
return 0;
}
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