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- #include <fstream>
- using namespace std;
- ifstream cin("intervale.in");
- ofstream cout("intervale.out");
- struct interval
- {
- int a,b;
- };
- interval a[101];
- int main()
- {
- int n,k=0,ok;
- cin>>n;
- for(int i=1;i<=n;i++)
- {
- cin>>a[i].a>>a[i].b;
- }
- for(int i=1;i<n;i++)
- {
- for(int j=i+1;j<=n;j++)
- {
- if(a[i].a>a[j].a)
- swap(a[i].a,a[j].a);
- if(a[i].b>a[j].b)
- swap(a[i].b,a[j].b);
- }
- }
- for(int i=1;i<=n;i++)
- {
- ok=0;
- if(a[i].b<a[i+1].a &&a[i].a<a[i+1].b)
- ok=1;
- if(ok==1)
- {
- k++;
- }
- }
- cout<<k<<endl;
- for(int i=1;i<=n;i++)
- {
- ok=0;
- if(a[i].b<a[i+1].a &&a[i].a<a[i+1].b)
- ok=1;
- if(ok==1)
- {
- cout<<a[i].a<<" "<<a[i].b<<endl;
- }
- }
- return 0;
- }
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