Submission #116622

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
116622	2019-06-13 08:30:36	tmwilliamlin168	Railway Trip (JOI17_railway_trip)	C++14	100 / 100	267 ms	14968 KiB

railway_trip

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#include <bits/stdc++.h>
using namespace std;
const int mxN=1e5;
int n, k, q, l[mxN], nl[17][mxN], nr[17][mxN];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> n >> k >> q;
  for(int i=0; i<n; ++i) {
    cin >> l[i];
    nl[0][i]=i-1;
    while(~nl[0][i]&&l[nl[0][i]]<l[i])
      nl[0][i]=nl[0][nl[0][i]];
  }
  nl[0][0]=0;
  for(int i=n-1; ~i; --i) {
    nr[0][i]=i+1;
    while(nr[0][i]<n&&l[nr[0][i]]<l[i])
      nr[0][i]=nr[0][nr[0][i]];
  }
  nr[0][n-1]=n-1;
  for(int i=1; i<17; ++i) {
    for(int j=0; j<n; ++j) {
      nl[i][j]=min(nl[i-1][nl[i-1][j]], nl[i-1][nr[i-1][j]]);
      nr[i][j]=max(nr[i-1][nl[i-1][j]], nr[i-1][nr[i-1][j]]);
    }
  }
 
 
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• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 25 / 25
• Subtask 4: 55 / 55