Submission #681994

#	Time	Username	Problem	Language	Result	Execution time	Memory
681994		boykut	Bootfall (IZhO17_bootfall)	C++14	13 / 100	1089 ms	352 KiB

bootfall

#include <bits/stdc++.h>

using namespace std;

const int MAX = 555;
int dp[MAX*MAX], cant[MAX*MAX];
int a[MAX];

int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  
  int n;
  cin >> n;
  
  dp[0] = 1;
  int sum = 0;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
    for (int x = sum; x >= 0; x--) {
      dp[x+a[i]] += dp[x];
    }
    sum += a[i];
  }
  
  if (sum%2 == 1 || dp[sum/2] == 0) {
    return cout << 0, 0;
  }
  
  vector<int> ans;
  for (int Tima = 0; Tima <= sum; Tima++) {
    
    for (int Without = 0; Without < n; Without++) {
      
      fill(dp, dp+sum+1, 0);
      dp[0] = 1;
      for (int i = 0; i < n; i++) {
        if (i == Without) {
          swap(a[i], Tima);
        }
        for (int x = sum-a[i]; x >= 0; x--) {
          dp[x + a[i]] += dp[x];
        }
        if (i == Without) {
          swap(a[i], Tima);
        }
      }
      if ((sum+Tima-a[Without])%2 == 1 || dp[(sum+Tima-a[Without])/2] == 0) {
        cant[Tima] = 1;
        break;
      } 
    }
    
  }
  
  for (int Tima = 0; Tima <= sum; Tima++) {
    if (cant[Tima] == 0)
      ans.push_back(Tima);
  }
  
  cout << ans.size() << "\n";
  for (int i = 0; i < ans.size(); i++) {
    cout << ans[i] << " ";
  }
  
  return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'int main()':
bootfall.cpp:62:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |   for (int i = 0; i < ans.size(); i++) {
      |                   ~~^~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 7 / 7
• Subtask 3: 0 / 15
• Subtask 4: 0 / 16
• Subtask 5: 0 / 21
• Subtask 6: 0 / 35