Submission #578423

#	Time	Username	Problem	Language	Result	Execution time	Memory
578423		Sam_a17	Global Warming (CEOI18_glo)	C++14	100 / 100	516 ms	16424 KiB

glo

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#pragma GCC optimize("Ofast")
 
#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 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> void print(set <T> v);
template <class T> void print(vector <T> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T, class V> void print(pair <T, V> p);
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(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 << "]";}
template <class T, class V> void print(unordered_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
long long dx[8] = {-1,0,1,0,1,-1,1,-1};
long long 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 != "" && str != "input") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
 
  if(str == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  }
}
 
// Random
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
 
// Indexed Set
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
const long long inf = 1e9;
long long n, x;

struct segTree {
  vector<long long> tree;
  int size = 1;

  void init(int s) {
    while(size < s) {
      size *= 2;
    }
    tree.assign(2 * size - 1, 0);
  }

  void upd(int u, long long value, int x, int lx, int rx) {
    if(rx - lx == 1) {
      tree[x] = max(tree[x], value);
      return;
    }

    int mid = (lx + rx) / 2;
    if(u < mid) {
      upd(u, value, 2 * x + 1, lx, mid);
    } else {
      upd(u, value, 2 * x + 2, mid, rx);
    }

    tree[x] = max(tree[2 * x + 1], tree[2 * x + 2]);
  }

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

  long long qry(int l, int r, int x, int lx, int rx) {
    if(lx >= r || rx <= l) {
      return 0;
    }

    if(lx >= l && rx <= r) {
      return tree[x];
    }

    int mid = (lx + rx) / 2;
    long long s1 = qry(l, r, 2 * x + 1, lx, mid);
    long long s2 = qry(l, r, 2 * x + 2, mid, rx);
    return max(s1, s2);
  }

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

segTree seg;

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

  vector<long long> a(n);
  vector<long long> val;

  for(int i = 0; i < n; i++) {
    cin >> a[i];
    val.push_back(a[i]);
    val.push_back(a[i] + x);
  }

  sort(all(val));
  uniq(val);

  seg.init(sz(val));
  vector<long long> dpRight(n, 1), dpLeft(n, 1);

  for(int i = n - 1; i >= 0; i--) {
    int id = lower_bound(all(val), a[i]) - val.begin();
    dpRight[i] = 1 + seg.qry(id + 1, sz(val) + 1);

    seg.upd(id, dpRight[i]);
  }

  seg.init(sz(val));

  long long answ = *max_element(all(dpRight));
  for(int i = 0; i < n; i++) {
    int id = lower_bound(all(val), a[i]) - val.begin();
    dpLeft[i] = 1 + seg.qry(0, id);

    if(i) {
      int idi = lower_bound(all(val), a[i] + x) - val.begin();
      answ = max(answ, dpRight[i] + seg.qry(id, idi));
    }

    seg.upd(id, dpLeft[i]);
  }

  printf("%lld\n", answ);
}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    while(test_case--) {
      solve_();
    }
  };
 
  int test_cases = 1;
  solve(test_cases);
 
  return 0;
}

Compilation message (stderr)

glo.cpp: In function 'void setIO(std::string)':
glo.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 + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:70:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:71:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   71 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25