为什么过不了编译

#include<bits/stdc++.h>
using namespace std;
struct note
{
int x,y;
}a[1005],b[1005];
bool cmp(const note&aa,const note&bb)
{
if(aa.x==bb.x)return aa.y<bb.y;
else return aa.x<bb.x;
// if(min(aa.x,aa.y)==min(bb.x,bb.y))return max(aa.x,aa.y)<max(bb.x,bb.y);
// else return min(aa.x,aa.y)<min(bb.x,bb.y);
}
int n,m,ans;
int main()
{
// freopen("guide.in","r",stdin);
// freopen("guide.out","w",stdout);
scanf("%d%d",&m,&n);
for(int i=1;i<=n;i++)
scanf("%d%d",&a[i].x,&a[i].y);
for(int i=1;i<=n;i++)
scanf("%d%d",&b[i].x,&b[i].y);
sort(a+1,a+n+1,cmp);
sort(b+1,b+n+1,cmp);
int j=1;
for(int i=1;i<=n;i++)
{
// cout<<i<<" "<<j<<": "<<ans<<"\n";
if(j==n)break;
while(1)
{
if(j==n)break;
if(a[i].x<=b[j].x&&a[i].y<=b[j].y)
{
j++;
ans++;
break;
}
j++;
}
}
cout<<ans+1;
return 0;
}