Submission #1009748

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009748		HappyCapybara	Seats (IOI18_seats)	C++17	11 / 100	4051 ms	67000 KiB

seats

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

int h, w;
vector<int> r, c;

void give_initial_chart(int H, int W, vector<int> R, vector<int> C){
  h = H;
  w = W;
  r = R;
  c = C;
}

int swap_seats(int a, int b){
  swap(r[a], r[b]);
  swap(c[a], c[b]);
  int res = 1;
  int T = r[0], B = r[0], L = c[0], R = c[0];
  unordered_set<int> s;
  for (int i=1; i<h*w; i++){
    int next = w*r[i] + c[i];
    if (r[i] < T){
      for (int j=r[i]; j<T; j++){
        for (int k=min(L, c[i]); k<=max(R, c[i]); k++) s.insert(w*j + k);
      }
    }
    if (r[i] > B){
      for (int j=B+1; j<=r[i]; j++){
        for (int k=min(L, c[i]); k<=max(R, c[i]); k++) s.insert(w*j + k);
      }
    }
    if (c[i] < L){
      for (int j=T; j<=B; j++){
        for (int k=c[i]; k<L; k++) s.insert(w*j + k);
      }
    }
    if (c[i] > R){
      for (int j=T; j<=B; j++){
        for (int k=R+1; k<=c[i]; k++) s.insert(w*j + k);
      }
    }
    T = min(T, r[i]); B = max(B, r[i]); L = min(L, c[i]); R = max(R, c[i]);
    s.erase(next);
    if (s.empty()) res++;
  }
  return res;
}

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