이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
typedef long long int lld;
typedef pair<lld,lld> pii;
#define rep(i,a,b) for(int i=a;i<b;i++)
int main(){
int n;
cin>>n;
pii arr[n];
rep(i,0,n){
cin>>arr[i].first>>arr[i].second;
arr[i].first/=2;
arr[i].second/=2;
}
sort(arr,arr+n);
reverse(arr,arr+n);
lld max_second=0;
lld ans=0;
rep(i,0,n){
ans+=arr[i].first*(max(max_second,arr[i].second)-max_second);
max_second=max(max_second,arr[i].second);
}
cout<<ans*4<<endl;
return 0;
}
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