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- #include <iostream>
- #include <algorithm>
- using namespace std;
- int main(){
- int n;
- cin>> n;
- int a[n], d[n], v=0;
- for(int i=0; i<n; i++){
- cin>> a[i];
- cin>> d[i];
- }
- sort(a, a+n);
- sort(d, d+n);
- for (int i=1; i<n; i++){
- if(a[i]<d[i-1]){
- v++;
- for(int j=i-2; j>=0; j--){
- if(a[i]<d[j])
- v++;
- else
- break;
- }
- }
- }
- cout<<(v+n)*2;
- }
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