Submission #344736

#	Time	Username	Problem	Language	Result	Execution time	Memory
344736		Sparky_09	Aliens (IOI16_aliens)	C++17	0 / 100	1 ms	364 KiB

aliens

#include "bits/stdc++.h"
using namespace std;
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define all(x) begin(x), end(x)
#define sz(x) (int)(x).size()
#define ll long long 
//typedef long long int;
typedef pair<int, int> pii;
typedef vector<int> vi;
#ifdef LOCAL_DEFINE
#pragma GCC optimize ("Ofast")
#pragma GCC target ("avx2")
#endif
  
#include "aliens.h"

long long take_photos(int n, int m, int k, std::vector<int> r, std::vector<int> c) {
  /*
    dp[i][k] = dp[j][k - 1] + area(j + 1, i)
    make new vector and add the points which matter in it
  */
  vector<pair<int, int>> temp;
  for(int i = 0; i < n; i++){
  	if(r[i] > c[i]){
  	  int a = c[i];
  	  c[i] = r[i];
  	  r[i] = a;
  	}
  	temp.emplace_back(c[i], r[i]);
  }
  	
  sort(temp.begin(), temp.end(), [](pair<int, int> x, pair<int, int> y){
    if(x.first == y.first) return x.second < y.second;
    return x.first < y.first;
  });
  vector<int> useless(n+1, 0);
  for(int i = 0; i < n; i++) {
    for(int j = i+1; j < n; j++) {
    	if(useless[i] or useless[j]) continue;
      if(temp[i].second >= temp[j].second){
        useless[j] = 1;
      }
    }
  }
  vector<pair<int, int>> final;
  for(int i = 0, j = 0; i < n; i++){
    if(!useless[i]){
    	final.emplace_back(temp[i].first, temp[i].second);
    	//cout << final[j].first << ' ' << final[j].second << '\n';
    	j++;
    }	
  }
  auto area = [&](int x, int y){
    if(x == 0){
      return (final[y].first - final[x].second + 1)*(final[y].first - final[x].second + 1);
    }
    else{
      return (final[y].first - final[x].second + 1)*(final[y].first - final[x].second + 1) - max(0, (final[x-1].first - final[x].second + 1)*(final[x-1].first - final[x].second + 1));
    }
  };
  n = final.size();
  int dp[n+2][n+2];
  memset(dp, 0x3f, sizeof dp);
  //dp[0][1] = 1;
  dp[0][0] = 0;
  for(int i = 0; i < n; i++){
    for(int j = 0; j <= i; j++){
    	for(int l = 1; l <= k; l++){
	      if(l == 1){
	        dp[i][l] = area(0, i);
	      }
	      else{
       	 	dp[i][l] = min(dp[i][l-1], dp[j][l-1] + area(j+1, i));
      	}
      }
    }
  }
  return dp[n-1][k];
}   

• Subtask 1: 0 / 4
• Subtask 2: 0 / 12
• Subtask 3: 0 / 9
• Subtask 4: 0 / 16
• Subtask 5: 0 / 19
• Subtask 6: 0 / 40