Submission #143918

#	Time	Username	Problem	Language	Result	Execution time	Memory
143918		Milki	Adriatic (CEOI13_adriatic)	C++14	100 / 100	460 ms	184664 KiB

adriatic

#include<bits/stdc++.h>
using namespace std;

#define FOR(i, a, b) for(int i = a; i < b; ++i)
#define REP(i, n) FOR(i, 0, n)
#define _ << " " <<
#define sz(x) ((int) x.size())
#define pb(x) push_back(x)
#define TRACE(x) cerr << #x << " = " << x << endl

typedef long long ll;
typedef pair<int, int> point;

const int MAXN = 2505, inf = 1e9, MAX = 2500;

int n, total[MAXN][MAXN];
bool imam[MAXN][MAXN];

struct Sum{
  int X[MAXN][MAXN], Y[MAXN][MAXN];

  Sum(){}

  void init_prefix(){
    REP(i, MAXN) REP(j, MAXN) X[i][j] = Y[i][j] = inf;
  }
  void init_suffix(){
    REP(i, MAXN) REP(j, MAXN) X[i][j] = Y[i][j] = 0;
  }

  void update_prefix(int x, int y){
    X[x][y] = min(X[x - 1][y], X[x][y - 1]);
    Y[x][y] = min(Y[x - 1][y], Y[x][y - 1]);

    if(imam[x][y]){
      X[x][y] = min(X[x][y], x);
      Y[x][y] = min(Y[x][y], y);
    }
  }
  void update_suffix(int x, int y){
    X[x][y] = max(X[x + 1][y], X[x][y + 1]);
    Y[x][y] = max(Y[x + 1][y], Y[x][y + 1]);

    if(imam[x][y]){
      X[x][y] = max(X[x][y], x);
      Y[x][y] = max(Y[x][y], y);
    }
  }
} prefix, suffix;

int dp_lt[MAXN][MAXN], dp_rt[MAXN][MAXN];
point in[MAXN * MAXN];

int get(int x1, int y1, int x2, int y2){
  return total[x2][y2] - total[x1 - 1][y2] - total[x2][y1 - 1] + total[x1 - 1][y1 - 1];
}

int rek_lt(int x, int y){
  //TRACE("OK"); TRACE(x); TRACE(y);
  //TRACE(get(x, 1, MAX, y));
  //TRACE(dp_lt[x][y]);
  if(dp_lt[x][y] != -1) { return dp_lt[x][y]; }
  if(get(x, 1, MAX, y) == 1) return dp_lt[x][y] = 1;

  int mx_x = suffix.X[x][y + 1], mn_y = prefix.Y[x - 1][y];
  if(mx_x == x && mn_y == y) return dp_lt[x][y] = 0;
  return dp_lt[x][y] = get(x, 1, MAX, y) + rek_lt( max(mx_x, x), min(mn_y, y) );
}

int rek_rt(int x, int y){
  //TRACE(x); TRACE(y); TRACE("KOK"); TRACE(get(1, y, x, MAX));
  if(dp_rt[x][y] != -1) return dp_rt[x][y];
  if(get(1, y, x, MAX) == 1) return dp_rt[x][y] = 1;
  //TRACE(x); TRACE(y);
  int mn_x = prefix.X[x][y - 1], mx_y = suffix.Y[x + 1][y];
  if(mn_x == x && mx_y == y) return dp_rt[x][y] = 0;
  return dp_rt[x][y] = get(1, y, x, MAX) + rek_rt( min(mn_x, x), max(mx_y, y) );
}

int main(){
  ios_base::sync_with_stdio(false); cin.tie(0);
  memset(dp_lt, -1, sizeof(dp_lt));
  memset(dp_rt, -1, sizeof(dp_rt));
  prefix.init_prefix();
  suffix.init_suffix();

  cin >> n;
  REP(i, n){
    int a, b; cin >> a >> b;
    imam[a][b] = 1;
    in[i] = point(a, b);
  }
  FOR(i, 1, MAX + 1) FOR(j, 1, MAX + 1){
    prefix.update_prefix(i, j);
    total[i][j] = total[i][j - 1] + total[i - 1][j] - total[i - 1][j - 1] + imam[i][j];
  }

  for(int i = MAX; i > 0; --i)
    for(int j = MAX; j > 0; --j)
      suffix.update_suffix(i, j);

  REP(i, n){
    int x = in[i].first, y = in[i].second;
    cout << rek_lt(x, y) + rek_rt(x, y) + total[MAX][MAX] - 3 << "\n";
    //break;
  }
}

• Subtask 1: 25 / 25
• Subtask 2: 25 / 25
• Subtask 3: 10 / 10
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20