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 ll;
typedef pair<int, int> pii;
const int MX=100010, inf=2e9;
int n;
pii P[MX];
multiset<int> X;
int main(){
ios::sync_with_stdio(0); cin.tie(0);
cin>>n;
for(int i=1; i<=n; i++) cin>>P[i].first>>P[i].second;
sort(P+1, P+n+1);
for(int i=1; i<=n; i++) X.insert(0);
for(int i=1; i<=n; i++){
int h,cnt; tie(h,cnt)=P[i];
auto itu=X.lower_bound(h-cnt+1);
auto itd=itu; itd--;
if(itu==X.end()){
int tmp=*itd;
X.erase(itd); X.insert(tmp+cnt);
}
else{
cnt-=h-(*itu);
X.erase(itu); X.insert(h);
int tmp=*itd;
X.erase(itd); X.insert(tmp+cnt);
}
}
ll prv=0, ans=0, cnt=n;
for(int x:X){
ans+=(x-prv)*cnt*(cnt-1)/2;
prv=x; cnt--;
}
cout<<ans;
return 0;
}
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