Submission #1207947

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207947		mychecksedad	Cultivation (JOI17_cultivation)	C++20	30 / 100	242 ms	1472 KiB

cultivation

/* 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'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n, m, w;
array<int, 2> a[N];
void solve(){
  cin >> n >> m >> w;
  vector<array<int, 2>> ST;
  int mn = n, mx = 1;
  for(int i = 1; i <= w; ++i){
    cin >> a[i][0] >> a[i][1];
    mn = min(mn, a[i][0]);
    mx = max(mx, a[i][0]);
  }

  for(int i = 1; i <= w; ++i){
    ST.pb({max(1, a[i][0] - (mn - 1)), min(n, a[i][0] + (n - mx))});
  }

  vi U, D;

  for(auto [l, r]: ST){
    U.pb(l - 1);
    D.pb(n - r);
    for(auto [l2, r2]: ST){
      if(r < l2 || r2 < l){
        if(r < l2){
          D.pb(l2 - r - 1);
          U.pb(l2 - r - 1);
        }else{
          D.pb(l - r2 - 1);
          U.pb(l - r2 - 1);
        }
      }
    }
  }

  sort(all(U));
  sort(all(D));
  U.erase(unique(all(U)), U.end());
  D.erase(unique(all(D)), D.end());

  int ans = INT_MAX;
  for(int u: U){
    u = u + (mn - 1);
    for(int d: D){
      d = d + (n - mx);

      // cerr << u << ' ' << d << '\n';

      vector<array<int, 3>> A, B;
      vi X;
      for(int i = 1; i <= w; ++i){
        A.pb({a[i][0] - u, a[i][0] + d, a[i][1]});
        B.pb({a[i][0] + d, a[i][0] - u, a[i][1]});
        X.pb(a[i][0] - u);
        X.pb(a[i][0] + d + 1);

        // cerr << A.back()[0] << ' ' << A.back()[1] << ' '<< A.back()[2] << '\n';
      }
      X.pb(1);
      X.pb(n);
      sort(all(A));
      sort(all(B));
      sort(all(X));
      X.erase(unique(all(X)), X.end());
      int ptr = 0, ptr2 = 0;
      int L = 0, R = 0, D = 0;
      multiset<int> Y; // active columns
      for(int x_pos: X){
        if(x_pos < 1 || x_pos > n) continue;
        // cerr << l << ' ' << r << ' ' << col << '\n';
        while(ptr < B.size() && B[ptr][0] < x_pos){
          Y.erase(Y.find(B[ptr][2]));
          ++ptr;
        }
        while(ptr2 < A.size() && A[ptr2][0] <= x_pos){
          Y.insert(A[ptr2][2]);
          ++ptr2;
        }
        
        if(Y.empty()){
          L = INT_MAX - d - u;
          R = D = 0;
          break;
        }        

        L = max(L, (*Y.begin()) - 1);
        R = max(R, m - (*prev(Y.end())));
        int last_val = (*Y.begin());
        for(auto val: Y){
          D = max(D, val - last_val - 1);
          last_val = val;
        }
      }
      // cerr << L << ' ' << R << ' ' << D << ' ' << d << ' ' << u << ' ' << L + R + max(0, D - L - R) + d + u << '\n';
      ans = min(ans, L + R + max(0, D - L - R) + d + u);
    }
  }
  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;
} 

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 15 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20