This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
ios_base::sync_with_stdio(false);
cin.tie(0);
int n;
cin >> n;
vector<int> v;
for(int i = 0; i < n; i++) {
int x, y;
cin >> x >> y;
auto it = upper_bound(v.begin(), v.end(), y);
if(it == v.end()) {
v.push_back(x);
}
else {
*it = max(*it, x);
}
}
cout << v.size();
return 0;
}
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