Submission #203796

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
203796	2020-02-22 07:56:54	dennisstar	Safety (NOI18_safety)	C++17	100 / 100	163 ms	5524 KiB

safety

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#include <bits/stdc++.h>
#define em emplace
using namespace std;
typedef long long ll;
priority_queue<ll> L, R;
int N; ll H, S, A;
int main() {
  cin>>N>>H;
  for (int i=1; i<=N; i++) {
    cin>>S;
    if (i==1) { L.em(S), R.em(-S); continue; }
    if (S<L.top()-H*(i-1)) A+=(L.top()-H*(i-1))-S, R.em(-L.top()+2*H*(i-1)), L.em(S+H*(i-1)), L.em(S+H*(i-1)), L.pop();
    else if (S>-R.top()+H*(i-1)) A+=S+R.top()-H*(i-1), L.em(-R.top()+2*H*(i-1)), R.em(-S+H*(i-1)), R.em(-S+H*(i-1)), R.pop();
    else L.em(S+H*(i-1)), R.em(-S+H*(i-1));
  }
  cout<<A<<'\n';
  return 0;
}
 
 
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