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- #include <bits/stdc++.h>
- using namespace std;
- #define ll long long
- #define test int t; cin>>t; for(int cs=1;cs<=t;cs++)
- int main()
- {
- ios_base::sync_with_stdio(0);
- cin.tie(0);cout.tie(0);
- vector<pair<ll,ll>>x;
- ll n,m=0,i,j,k,l=0;
- cin>>n;
- for(i=0;i<n;i++)
- {
- cin>>j>>k;
- x.push_back({k,j});
- }
- sort(x.begin(),x.end());
- for(auto s:x)
- {
- if(s.second>=l)
- {
- m++;
- l=s.first;
- }
- }
- cout<<m<<endl;
- return 0;
- }
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