区间贪心 今年暑假不AC

#include<bits/stdc++.h>
using namespace std;

struct T{
    int b;
    int e;
    bool operator < (const T & a){
        return e<a.e;
    }
};

int main(){
    int n;
    while(cin>>n){
        if(n==0){
            break;
        }
        T a[n];
        for(int i=0;i<n;i++){
            cin>>a[i].b>>a[i].e;
        }
        sort(a,a+n);
        int time=0;
        int answer=0;
        for(int i=0;i<n;i++){
            if(a[i].b>=time){
                time=a[i].e;
                answer++;
            }
        }
        cout<<answer<<endl;
    }    
    return 0;
}