30 lines
594 B
C++
30 lines
594 B
C++
#include <bits/stdc++.h>
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using namespace std;
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#define pb push_back
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int main()
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{
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int N;
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while(cin>>N){
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vector <int> arr[201];
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for (int i=1;i<=N;i++){
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int a, b;
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scanf("%d%d",&a,&b);
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arr[a].pb(b);
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}
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int mn=2e9, ans=0;
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for (int i=1;i<=N+N;i++){
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if (mn < i) ans++, mn = 2e9;
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for(int j=0;j<arr[i].size();j++)
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{
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int e=arr[i][j];
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mn=min(mn,e);
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}
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}
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if (mn < 2e9) ans++;
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printf("%d\n", ans);
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}
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return 0;
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}
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