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按右端点排序的#include<queue>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<set>
using namespace std;
struct Node {
int l, r, id;
bool operator<(const Node&rhs) const{
if(r!=rhs.r)return r<rhs.r;
return l<rhs.l;
}
}a[200066];
int n;
multiset<pair<int, int> >Set;
int pos[50060];
int main()
{
while(scanf("%d", &n)==1){
for (int i = 1; i <= n; i++)
{
scanf("%d%d", &a[i].l, &a[i].r);
a[i].id=i;
}
sort(a+1, a+n+1);
int tot=0;
for(int i=1; i<=n; i++){
if(Set.size()==0||(*Set.begin()).first>=a[i].l){
Set.insert(make_pair(a[i].r, ++tot));
pos[a[i].id]=tot;
}else {
multiset<pair<int, int> >::iterator it=Set.upper_bound(make_pair(a[i].l, 0));
--it;
int p=(*it).second;
Set.erase(it);
Set.insert(make_pair(a[i].r, p));
pos[a[i].id]=p;
}
}
printf("%d\n", (int)Set.size());
for(int i=1; i<=n; i++) printf("%d\n", pos[i]);
}
return 0;
}
/*
5
1 2
4 5
6 7
8 9
3 10
*/
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