Submission #720326

#	Time	Username	Problem	Language	Result	Execution time	Memory
720326		Yell0	Sequence (BOI14_sequence)	C++17	0 / 100	1 ms	340 KiB

sequence

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
const int MN=1e6+2;
int N,l[MN],r[MN],a[MN],is[MN];
ll ans=0;

bool cmp(int i,int j) {
  return a[i]<a[j];
}

int main() {
  ios::sync_with_stdio(0);cin.tie(0);
  cin>>N;
  a[0]=a[N+1]=INT_MAX;
  for(int i=1;i<=N;++i) {
    is[i]=i;
    l[i]=i-1;
    r[i]=i+1;
    cin>>a[i];
  }
  sort(is+1,is+1+N,cmp);
  for(int x=1;x<N;++x) {
    r[l[is[x]]]=r[is[x]];
    l[r[is[x]]]=l[is[x]];
    ans+=min(a[l[is[x]]],a[r[is[x]]]);
  }
  cout<<ans<<'\n';
  return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 33
• Subtask 3: 0 / 25
• Subtask 4: 0 / 33