Submission #289459

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
289459	2020-09-02 16:41:37	nandonathaniel	Railway Trip (JOI17_railway_trip)	C++14	20 / 100	2084 ms	8600 KiB

railway_trip

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#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
const int MAXN=100005,INF=1e9;
int a[MAXN],L[MAXN],R[MAXN];
vector<int> adj[MAXN];
bool visited[MAXN];
int main(){
  ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
  int n,k,q,u,v;
  cin >> n >> k >> q;
  for(int i=1;i<=n;i++)cin >> a[i];
  stack<int> kiri;
  kiri.push(1);
  for(int i=2;i<=n;i++){
    while(a[kiri.top()]<a[i])kiri.pop();
    adj[i].push_back(kiri.top());
    adj[kiri.top()].push_back(i);
    kiri.push(i);
  }
  stack<int> kanan;
  kanan.push(n);
  for(int i=n-1;i>=1;i--){
    while(a[kanan.top()]<a[i])kanan.pop();
    adj[i].push_back(kanan.top());
    adj[kanan.top()].push_back(i);
    kanan.push(i);
  }
  while(q--){
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 0 / 25
• Subtask 4: 0 / 55