Submission #801596

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
801596	2023-08-02 06:50:18	gun_gan	Fancy Fence (CEOI20_fancyfence)	C++17	100 / 100	27 ms	7876 KiB

fancyfence

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#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MX = 1e5 + 5, mod = 1e9 + 7, inv = 500000004;
int N;
ll h[MX], w[MX];
ll L[MX], R[MX], sum[MX];
int main() {
  ios_base::sync_with_stdio(0); cin.tie(0);
  
  cin >> N;
  
  for(int i = 1; i <= N; i++) cin >> h[i];
  for(int i = 1; i <= N; i++) cin >> w[i];
  
  vector<pair<ll,ll>> v;
  
  for(int i = 1; i <= N; i++) {
    while(!v.empty() && v.back() > make_pair(h[i], (ll)i)) v.pop_back();
    if(!v.empty()) L[i] = v.back().second;
    v.push_back({h[i], i});
  }
  
  v.clear();
  
  for(int i = N; i >= 1; i--) {
    while(!v.empty() && v.back() > make_pair(h[i], (ll)i)) v.pop_back();
 
 
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• Subtask 1: 0 / 0
• Subtask 2: 12 / 12
• Subtask 3: 13 / 13
• Subtask 4: 15 / 15
• Subtask 5: 15 / 15
• Subtask 6: 18 / 18
• Subtask 7: 27 / 27