제출 #805976

#	제출 시각UTC-0	아이디	문제	언어	결과	실행 시간	메모리
805976	2023-08-04 04:04:46	MetalPower	Railway Trip (JOI17_railway_trip)	C++14	100 / 100	149 ms	18048 KiB

railway_trip

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#include <bits/stdc++.h>
using namespace std;
#define pii pair<int, int>
#define fi first
#define se second
const int MX = 1e5 + 10;
const int LG = 18;
const int INF = 1e9 + 7;
int N, K, Q, arr[MX], lf[MX], rg[MX], L[MX][LG], R[MX][LG];
int main(){
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
  cin >> N >> K >> Q;
  for(int i = 1; i <= N; i++) cin >> arr[i];
  {
    vector<int> stk;
    for(int i = 1; i <= N; i++){
      for(; !stk.empty() && arr[stk.back()] < arr[i]; ) stk.pop_back();
      if(!stk.empty()) lf[i] = stk.back();
      else lf[i] = 0;
      stk.push_back(i);
    }
    stk.clear();
  }
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 55 / 55