Submission #880661

#	Time	Username	Problem	Language	Result	Execution time	Memory
880661		mychecksedad	Sandcastle 2 (JOI22_ho_t5)	C++17	15 / 100	5099 ms	1184 KiB

Main

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n, m, val;
array<int, 2> pos[N];
vector<vector<int>> v;

int calc(int x, int y){
  return abs(pos[x][0] - pos[y][0]) + abs(pos[x][1] - pos[y][1]) == 1;
}


void upd(int x, set<int> &s){
  auto it = s.upper_bound(x);
  if(s.empty()){
    s.insert(x);
    return;
  }
  if(it == s.begin()){
    val += calc(x, *it);
    s.insert(x);
    return;
  }
  if(it == s.end()){
    auto it1 = prev(it);
    val += calc(x, *it1);
    s.insert(x);
    return;
  }

  auto it1 = prev(it);
  val -= calc(*it, *it1);
  val += calc(x, *it);
  val += calc(x, *it1);
  s.insert(x);
}

void solve(){
  cin >> n >> m;
  if(max(n, m) > 7000) return;
  vector<int> V;
  v.resize(n);
  for(int i = 0; i < n; ++i){
    v[i].resize(m);
    for(int j = 0; j < m; ++j){
      cin >> v[i][j];
      V.pb(v[i][j]);
    }
  }
  if(n > m){
    vector<vector<int>> g;
    g.resize(m);
    for(int i = 0; i < m; ++i){
      g[i].resize(n);
      for(int j = 0; j < n; ++j) g[i][j] = v[j][i];
    }
    g.swap(v);
    swap(n, m);
  }
  sort(all(V));
  for(int i = 0; i < n; ++i){
    for(int j = 0; j < m; ++j){
      v[i][j] = lower_bound(all(V), v[i][j]) - V.begin() + 1;
      pos[v[i][j]] = {i, j};
    }
  }
  int ans = 0;
  for(int i = 0; i < n; ++i){
    for(int j = i; j < n; ++j){
      for(int c = 0; c < m; ++c){
        set<int> s;
        val = 1;
        for(int c1 = c; c1 >= 0; --c1){
          for(int k = i; k <= j; ++k){
            upd(v[k][c1], s);
          }
          if(val == (c-c1+1)*(j-i+1)){
            ans++;
          }
          if(val <= (c-c1+1)*(j-i+1) - (j-i+2)/2) break;
        }
      }
    }
  }
  cout << ans;
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:100:15: warning: unused variable 'aa' [-Wunused-variable]
  100 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 9
• Subtask 2: 10 / 10
• Subtask 3: 5 / 5
• Subtask 4: 0 / 56
• Subtask 5: 0 / 20