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#include <iostream> #include <vector> #include <algorithm> using namespace std; int main() { vector<pair<int, int>> v; int n; cin >> n; for(int i = 0; i < n; i++) { int a, b; cin >> a >> b; v.push_back(make_pair(b, a)); } sort(v.begin(), v.end()); int res = 1; int vreme = v[0].first; for(int i = 1; i < n; i++) { if(vreme <= v[i].second) { res++; vreme = v[i].first; } } cout << res << endl; return 0; }
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