Submission #735789

#	Time	Username	Problem	Language	Result	Execution time	Memory
735789		Sam_a17	Railway Trip 2 (JOI22_ho_t4)	C++17	27 / 100	2070 ms	158552 KiB

Main

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int((x).size()))
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt(x) __builtin_popcount(x)
 
#define pb push_back
#define popf pop_front
#define popb pop_back
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  if (str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const int N = 2e5 + 10, LOG = 17;
multiset<int> to_add[N], to_erase[N];
multiset<int> add[N], rase[N];
int n, k, m, q, l[N], r[N];
pair<long long, long long> up[N][LOG];

// segment Tree Max
// Range Queries
struct segTree {
  vector<pair<long long, long long>> mTree;
  int size;

  void init(long long n) {
    size = 1;
    while(size < n)  {
      size *= 2;
    }
    mTree.assign(2 * size - 1, {INT64_MAX, INT64_MIN});
  }

  pair<long long, long long> combine(pair<long long, long long> a, pair<long long, long long> b) {
    return make_pair(min(a.first, b.first), max(a.second, b.second));
  }

  void upd(int u, long long li, long long ri, int x, int lx, int rx) { // set value at pos u
    if(rx - lx == 1) {
      mTree[x] = {li, ri};
      return;
    }

    int m = (lx + rx) / 2;
    if(u < m) {
      upd(u, li, ri, 2 * x + 1, lx, m);
    }else {
      upd(u, li, ri, 2 * x + 2, m, rx);
    }
    mTree[x] = combine(mTree[2 * x + 1], mTree[2 * x + 2]);
  }

  void upd(int u, long long li, long long ri) {
    upd(u, li, ri, 0, 0, size);
  }

  pair<long long, long long> qry (int l, int r, int x, int lx, int rx) { // range queries
    if(l >= rx || lx >= r) {
      return {INT64_MAX, INT64_MIN};
    }
    if(lx >= l && r >= rx) {
      return mTree[x];
    }

    int m = (rx + lx) / 2;
    auto s1 = qry(l, r, 2 * x + 1, lx, m);
    auto s2 = qry(l, r, 2 * x + 2, m, rx);
    return combine(s1, s2);
  }

  pair<long long, long long> qry(int l, int r) {
    return qry(l, r, 0, 0, size);
  }
};

segTree seg_max[LOG];

void solve_() {
  cin >> n >> k;

  cin >> m;

  for(int i = 0; i < LOG; i++) {
    seg_max[i].init(n + 3);
  }

  for(int i = 1; i <= m; i++) {
    int s, t; cin >> s >> t;

    if(s < t) {
      int tt = min(t - 1, s + k - 1);
      to_add[s].insert(t);
      to_erase[tt + 1].insert(t);
    } else {
      // s > t
      int tt = max(t + 1, s - k + 1);
      add[s].insert(t);
      rase[tt - 1].insert(t);
    }
  }

  multiset<int> curr;
  for(int i = 1; i <= n; i++) {
    for(auto j: to_add[i]) {
      curr.insert(j);
    }

    for(auto j: to_erase[i]) {
      curr.erase(curr.find(j));
    }


    if(!curr.empty()) {
      r[i] = max(i, *curr.rbegin());
    } else {
      r[i] = i;
    }
  }

  curr.clear();
  for(int i = n; i >= 1; i--) {
    for(auto j: add[i]) {
      curr.insert(j);
    }

    for(auto j: rase[i]) {
      curr.erase(curr.find(j));
    }

    if(!curr.empty()) {
      l[i] = min(i, *curr.begin());
    } else {
      l[i] = i;
    }
  }

  for(int i = 1; i <= n; i++) {
    up[i][0] = {l[i], r[i]};
    seg_max[0].upd(i, l[i], r[i]);
  }

  for(int j = 1; j < LOG; j++) {
    for(int i = 1; i <= n; i++) {
      up[i][j] = seg_max[j - 1].qry(up[i][j - 1].first, up[i][j - 1].second + 1);
      seg_max[j].upd(i, up[i][j].first, up[i][j].second);
    }
  }

  //
  cin >> q;
  for(int i = 1; i <= q; i++) {
    int s, t; cin >> s >> t;

    int ina = 0, inb = n, ans = -2;
    pair<long long, long long> pr;
    while(ina <= inb) {
      int mid = (ina + inb) / 2;
      pr = {l[s], r[s]};

      for(int j = 0; j < LOG; j++) {
        if(mid & (1 << j)) {
          auto uu = seg_max[j].qry(pr.first, pr.second + 1);
          pr.first = min(pr.first, uu.first);
          pr.second = max(pr.second, uu.second);
        }
      }

      if(t >= pr.first && t <= pr.second) {
        ans = mid;
        inb = mid - 1;
      } else {
        ina = mid + 1;
      }
    }

    cout << ans + 1 << '\n';
  }
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

Main.cpp: In function 'void setIO(std::string)':
Main.cpp:64:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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