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;
long long n,hmax;
long long ans;
struct barci{long long h,w;}v[100010];
stack<pair<long long,long long>>s,ss;
bool comp(barci a,barci b)
{
return a.h<b.h;
}
void adauga(long long cost,long long length)
{
if(!s.empty()&&cost==s.top().first)
{
length+=s.top().second;
s.pop();
}
s.push({cost,length});
}
int main()
{
cin>>n;
for(long long i=1;i<=n;++i)
cin>>v[i].h>>v[i].w;
sort(v+1,v+n+1,comp);
for(long long i=1;i<=n;++i)
{
if(v[i].h!=hmax)
{
adauga(0,v[i].h-hmax);
hmax=v[i].h;
}
while(v[i].w)
{
if(v[i].w>=s.top().second)
{
ss.push({s.top().first+1,s.top().second});
ans+=s.top().first*s.top().second;
v[i].w-=s.top().second;
s.pop();
}
else
{
ans+=v[i].w*s.top().first;
ss.push({s.top().first,s.top().second-v[i].w});
ss.push({s.top().first+1,v[i].w});
v[i].w=0;
s.pop();
}
}
while(!ss.empty())
{
adauga(ss.top().first,ss.top().second);
ss.pop();
}
}
cout<<ans;
return 0;
}
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