Submission #296702

#	Time	Username	Problem	Language	Result	Execution time	Memory
296702		Bruteforceman	Seats (IOI18_seats)	C++11	5 / 100	4077 ms	43768 KiB

seats

#include "bits/stdc++.h"
#include "seats.h"
using namespace std;
vector <vector <int>> a;
vector <int> row, col;
int h, w;
bool inside(int x, int y) {
  return (0 <= x && x < h) && (0 <= y && y < w);
}
bool isOkay(int R) {
  int total = 0;
  for(int i = 0; i <= R; i++) {
    for(int dx : {-1, 1}) {
      for(int dy : {-1, 1}) {
        int x = row[i];
        int y = col[i];
        int cnt = 0;
        if(!inside(x + dx, y) || a[x + dx][y] > R) ++cnt;
        if(!inside(x, y + dy) || a[x][y + dy] > R) ++cnt;
        if(cnt == 2) ++total;
      }
    }
  }
  for(int i = R + 1; i < h * w; i++) {
    for(int dx : {-1, 1}) {
      for(int dy : {-1, 1}) {
        int x = row[i];
        int y = col[i];
        int cnt = 0;
        if(inside(x + dx, y) && a[x + dx][y] <= R) ++cnt;
        if(inside(x, y + dy) && a[x][y + dy] <= R) ++cnt;
        if(cnt == 2) ++total;
      }
    }
  }
  return (total == 4);
}
void give_initial_chart(int H, int W, std::vector<int> R, std::vector<int> C) {
  h = H;
  w = W;
  a = vector <vector <int>> (H, vector <int> (W, 0));
  row = R;
  col = C;
  for(int i = 0; i < H * W; i++) {
    a[row[i]][col[i]] = i;
  }
}

int swap_seats(int p, int q) {
  swap(a[row[p]][col[p]], a[row[q]][col[q]]);
  swap(row[p], row[q]);
  swap(col[p], col[q]);
  int ans = 0;
  for(int i = 0; i < h * w; i++) {
    ans += isOkay(i); 
  }
  return ans;
}

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 0 / 20
• Subtask 4: 0 / 6
• Subtask 5: 0 / 33
• Subtask 6: 0 / 30