Submission #1029602

#	Time	Username	Problem	Language	Result	Execution time	Memory
1029602		NeroZein	Railway Trip 2 (JOI22_ho_t4)	C++17	16 / 100	2033 ms	4160 KiB

Main

#include "bits/stdc++.h"
using namespace std;

#ifdef Nero
#include "Deb.h"
#else
#define debug(...)
#endif

const int N = 1e5 + 5;

int cost[N];
int l[N], r[N];

int main() {
  ios::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, k, m;
  cin >> n >> k >> m;
  for (int i = 1; i <= n; ++i) {
    l[i] = r[i] = i;
  }
  for (int i = 0; i < m; ++i) {
    int u, v;
    cin >> u >> v;
    if (u < v) {
      r[u] = max(r[u], v);
    } else {
      l[u] = min(l[u], v); 
    }
  }
  int q;
  cin >> q;
  while (q--) {
    int u, v;
    cin >> u >> v;
    for (int i = 1; i <= n; ++i) {
      cost[i] = n + 1; 
    }
    cost[u] = 0;
    int cur = 0;
    int cl = u, cr = u;//range of reachable nodes
    while (true) {
      cur++;
      bool change = false; 
      int mnL = n, mxR = 0;
      for (int i = cl; i <= cr; ++i) {
        mxR = max(mxR, r[i]);
        mnL = min(mnL, l[i]);
      }
      for (int i = cl - 1; i >= max(1, cl - k + 1); --i) {
        mxR = max(mxR, r[i]);
      }
      for (int i = cr + 1; i <= min(n, cr + k - 1); ++i) {
        mnL = min(mnL, l[i]);
      }
      if (cl > mnL) {
        for (int i = mnL; i < cl; ++i) {
          cost[i] = cur; 
        }
        cl = mnL;
        change = true;
      }
      if (cr < mxR) {
        for (int i = cr + 1; i <= mxR; ++i) {
          cost[i] = cur;
        }
        cr = mxR;
        change = true;
      }
      if (!change) {
        break; 
      }
    }
    if (cost[v] == n + 1) {
      cost[v] = -1;
    }
    cout << cost[v] << '\n';
  }
  return 0;
}

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 0 / 11
• Subtask 4: 0 / 25
• Subtask 5: 0 / 35
• Subtask 6: 0 / 13