oj.uz

Submission #781181

# Submission time Handle Problem Language Result Execution time Memory
781181 2023-07-12T21:26:58 Z Sam_a17 Radio Towers (IOI22_towers) C++17
18 / 100
 769 ms 6020 KB 
#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 __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
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;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
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(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> void print(Tree <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> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// 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 == "input") {
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
  } else if(str != "") {
    freopen((str + ".in").c_str(), "r", stdin);
    freopen((str + ".out").c_str(), "w", stdout);
  }
}

const int N = 2e5 + 10;
int a[N], mid = -1;
int f1 = 1, n;
vector<int> b;
int pi[N];

struct segTreeMax {
  vector<long long> mTree;
  int size;
 
  void init(long long n) {
    size = 1;
    while(size < n)  {
      size *= 2;
    }
    mTree.assign(2 * size - 1, INT64_MIN);
  }
 
  void upd(int u, long long v, int x, int lx, int rx) { // set value at pos u
    if(rx - lx == 1) {
      mTree[x] = v;
      return;
    }
 
    int m = (lx + rx) / 2;
    if(u < m) {
      upd(u, v, 2 * x + 1, lx, m);
    }else {
      upd(u, v, 2 * x + 2, m, rx);
    }
    mTree[x] = max(mTree[2 * x + 1], mTree[2 * x + 2]);
  }
 
  void upd(int u, long long v) {
    upd(u, v, 0, 0, size);
  }
 
  long long qry (int l, int r, int x, int lx, int rx) { // range queries
    if(l >= rx || lx >= r) {
      return INT64_MIN;
    }
    if(lx >= l && r >= rx) {
      return mTree[x];
    }
 
    int m = (rx + lx) / 2;
    long long s1 = qry(l, r, 2 * x + 1, lx, m);
    long long s2 = qry(l, r, 2 * x + 2, m, rx);
    return max(s1, s2);
  }
 
  long long qry(int l, int r) {
    if(l >= r) {
      return -10;
    } 
    return qry(l, r, 0, 0, size);
  }
};

segTreeMax seg_max, seg_all;

vector<int> vec;

void init(int maxN, std::vector<int> H) {
  n = maxN;
  pair<int, int> mx = {0, 0};

  seg_all.init(n + 1);
  for(int i = 0; i < n; i++) {
    a[i] = H[i];
    seg_all.upd(i, a[i]);
    mx = max(mx, make_pair(a[i], i));
  }
  
  vector<int> lowRig(n + 1, n), lowLef(n + 1, -1);
  stack<pair<int, int>> st;
  for(int i = 0; i < n; i++) {
    while(!st.empty() && st.top().first > a[i]) {
      int cur = st.top().second;
      lowRig[cur] = i;
      st.pop();
    }

    if(!st.empty()) {
      lowLef[i] = st.top().second;
    }
    st.push({a[i], i});
  }

  for(int i = 0; i < n; i++) {
    int curl = seg_all.qry(lowLef[i] + 1, i);
    if(i == 0) {
      curl = 2e9 + 10;
    }
    int curr = seg_all.qry(i + 1, lowRig[i]);
    if(i == n - 1) {
      curr = 2e9 + 10;
    }
    vec.push_back(min(curl, curr) - a[i]);
  }

  sort(all(vec));
  mid = mx.second;
  for(int i = 0; i < mid; i++) {
    if(a[i + 1] <= a[i]) {
      f1 = 0;
    }
  }

  for(int i = mid + 1; i < n; i++) {
    if(a[i] >= a[i - 1]) {
      f1 = 0;
    }
  }

  for(int i = 1; i < n - 1; i++) {
    pi[i] = pi[i - 1] + (a[i] > a[i - 1] && a[i] > a[i + 1]);
  }
  pi[n - 1] = pi[n - 2];
}

int max_towers(int L, int R, int D) {

  if(L == 0 && R == n - 1) {
    auto it = lower_bound(all(vec), D);
    int answ = 1;
    if(it != vec.end()) {
      int ind = it - vec.begin();
      answ = max(answ, n - ind);
    }
    // dbg(answ)
    return answ;
  }

  if(f1) {
    if(R <= mid || L >= mid) {
      return 1;
    }

    if(R - L + 1 == 1) {
      return 1;
    }

    if(a[mid] - D >= max(a[L], a[R])) {
      return 2;
    } else {
      return 1;
    }
  } else if(D == 1) {
    int cur = pi[R - 1] - pi[L] + 1;
    return max(1, cur);
  } else {
    vector<long long> dp(n + 1);
    long long answ = 0;

    set<pair<long long, long long>> ft;
    deque<pair<int, int>> vec;
    seg_max.init(n + 5);
    for(int i = L; i <= R; i++) {
      dp[i] = 1;

      auto it = lower_bound(all(vec), make_pair(a[i] + D, -1));
      if(it != vec.end()) {
        int ind = it - vec.begin();
        if(vec[ind].second >= 1) {
          dp[i] = max(dp[i], seg_max.qry(0, vec[ind].second) + 1);
        }
      }

      while (!vec.empty() && a[i] > vec.front().first) {
        vec.pop_front();
      }
      vec.push_front({a[i], i});

      while(!ft.empty() && ft.begin()->first <= a[i] - D) {
        seg_max.upd(ft.begin()->second, dp[ft.begin()->second]);
        ft.erase(ft.begin());
      }
      ft.insert({a[i], i});

      answ = max(answ, dp[i]);
    }
 
    return answ;
  }
}

Compilation message

towers.cpp: In function 'void setIO(std::string)':
towers.cpp:76:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |     freopen("input.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
towers.cpp:77:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |     freopen("output.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
towers.cpp:79:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |     freopen((str + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
towers.cpp:80:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |     freopen((str + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 385 ms 3368 KB Output is correct
2 Correct 428 ms 5876 KB Output is correct
3 Correct 578 ms 5872 KB Output is correct
4 Correct 623 ms 6020 KB Output is correct
5 Correct 614 ms 5148 KB Output is correct
6 Correct 602 ms 5832 KB Output is correct
7 Correct 756 ms 5152 KB Output is correct
8 Correct 0 ms 208 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 464 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 464 KB Output is correct
12 Correct 1 ms 208 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
26 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 464 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 464 KB Output is correct
12 Correct 1 ms 208 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
26 Halted 0 ms 0 KB -

Subtask #4
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 491 ms 5152 KB Output is correct
2 Correct 723 ms 5184 KB Output is correct
3 Correct 713 ms 5184 KB Output is correct
4 Correct 645 ms 5184 KB Output is correct
5 Correct 679 ms 5184 KB Output is correct
6 Correct 736 ms 5176 KB Output is correct
7 Correct 495 ms 5156 KB Output is correct
8 Correct 712 ms 5944 KB Output is correct
9 Correct 698 ms 5168 KB Output is correct
10 Correct 646 ms 5712 KB Output is correct
11 Correct 641 ms 5152 KB Output is correct
12 Correct 769 ms 5804 KB Output is correct
13 Correct 623 ms 5184 KB Output is correct
14 Correct 1 ms 208 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 41 ms 5156 KB Output is correct
18 Correct 40 ms 5172 KB Output is correct
19 Correct 40 ms 5192 KB Output is correct
20 Correct 26 ms 5248 KB Output is correct
21 Correct 42 ms 5968 KB Output is correct
22 Correct 36 ms 5228 KB Output is correct
23 Correct 40 ms 5208 KB Output is correct
24 Correct 34 ms 5224 KB Output is correct
25 Correct 26 ms 5184 KB Output is correct
26 Correct 34 ms 5608 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Correct 1 ms 336 KB Output is correct
36 Correct 1 ms 336 KB Output is correct

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 152 ms 1616 KB 3rd lines differ - on the 1st token, expected: '150', found: '149'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 336 KB Output is correct
3 Correct 1 ms 464 KB Output is correct
4 Correct 1 ms 336 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 336 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 464 KB Output is correct
12 Correct 1 ms 208 KB Output is correct
13 Correct 1 ms 336 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 336 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 336 KB Output is correct
22 Correct 1 ms 336 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
26 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 385 ms 3368 KB Output is correct
2 Correct 428 ms 5876 KB Output is correct
3 Correct 578 ms 5872 KB Output is correct
4 Correct 623 ms 6020 KB Output is correct
5 Correct 614 ms 5148 KB Output is correct
6 Correct 602 ms 5832 KB Output is correct
7 Correct 756 ms 5152 KB Output is correct
8 Correct 0 ms 208 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Correct 1 ms 336 KB Output is correct
13 Correct 1 ms 464 KB Output is correct
14 Correct 1 ms 336 KB Output is correct
15 Correct 1 ms 336 KB Output is correct
16 Correct 1 ms 336 KB Output is correct
17 Correct 1 ms 464 KB Output is correct
18 Correct 1 ms 336 KB Output is correct
19 Correct 1 ms 336 KB Output is correct
20 Correct 1 ms 336 KB Output is correct
21 Correct 1 ms 464 KB Output is correct
22 Correct 1 ms 208 KB Output is correct
23 Correct 1 ms 336 KB Output is correct
24 Correct 1 ms 336 KB Output is correct
25 Correct 1 ms 336 KB Output is correct
26 Correct 1 ms 336 KB Output is correct
27 Correct 1 ms 336 KB Output is correct
28 Correct 1 ms 336 KB Output is correct
29 Correct 1 ms 336 KB Output is correct
30 Correct 1 ms 336 KB Output is correct
31 Correct 1 ms 336 KB Output is correct
32 Correct 1 ms 336 KB Output is correct
33 Correct 1 ms 336 KB Output is correct
34 Correct 1 ms 336 KB Output is correct
35 Incorrect 1 ms 336 KB 1st lines differ - on the 1st token, expected: '34', found: '33'
36 Halted 0 ms 0 KB -