Language: C++

#include<bits/stdc++.h>
using namespace std;
#define _GLIBCXX_DEBUG
#define lint long long
#define ll long long
#define pq priority_queue
#define mp make_pair
#define pb push_back
#define vl vector<long long>
#define pii pair<long long,long long>
#define all(x) (x).begin(),(x).end()
#define rep(x) for(int i = 0;i < (x);i++)
#define repj(x) for(int j = 0;j < (x);j++)
#define REP(i,x) for(int (i) = 0;(i) < (x);(i)++)
#define rrep(x) for(int i = (x);i >= 0;i--)
#define mod 1000000007
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << " " << __FILE__ << endl;
int qp(int a,ll b){int ans=1;do{if(b&1)ans=1ll*ans*a;a=1ll*a*a;}while(b>>=1);return ans;}
int qp(int a,ll b,int mo){int ans=1;do{if(b&1)ans=1ll*ans*a%mo;a=1ll*a*a%mo;}while(b>>=1);return ans;}
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int dx[4]={1,0,-1,0};
int dy[4]={0,1,0,-1};
long long INF = 1e10;

int main(){
    int n; cin >> n;
    vector<pii> red(n),blue(n);
    vector<bool> ured(n);
    rep(n){cin>>red[i].second>>red[i].first; ured[i]=false;}
    rep(n){cin>>blue[i].first>>blue[i].second;}
    int cnt = 0;
    sort(all(red)),sort(all(blue)),reverse(all(red));
    rep(n){
        int x = blue[i].first,y = blue[i].second;
        int j;bool chk = false;
        //debug(x);debug(y);
        for(j=0;j<n;j++){
            int xr = red[j].second,yr = red[j].first;
            /*debug(xr);
            debug(yr);
            debug(xr < x);
            debug(yr < y);
            debug(!ured[j]);*/
            if(xr<x　&&　yr<y　&&　!ured[j]){
                chk = true;
                ured[j] = true;
                break;
            }
        }
        if(chk) cnt++;
    }
    cout << cnt << endl;
}

Compiler output:
a.cc:45:19: error: extended character 　 is not valid in an identifier
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                   ^
a.cc:45:24: error: extended character 　 is not valid in an identifier
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                        ^
a.cc:45:29: error: extended character 　 is not valid in an identifier
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                             ^
a.cc:45:34: error: extended character 　 is not valid in an identifier
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                                  ^
a.cc: In function 'int main()':
a.cc:45:19: error: 'x\U00003000' was not declared in this scope
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                   ^~~
a.cc:45:24: error: '\U00003000yr' was not declared in this scope
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                        ^~~~
a.cc:45:29: error: 'y\U00003000' was not declared in this scope
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                             ^~~
a.cc:45:34: error: '\U00003000' was not declared in this scope
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |                                  ^~
a.cc:45:36: error: expected ')' before '!' token
   45 |             if(xr<x　&&　yr<y　&&　!ured[j]){
      |               ~                    ^
      |                                    )