Submission #406041

#	Time	Username	Problem	Language	Result	Execution time	Memory
406041		codebuster_10	Bootfall (IZhO17_bootfall)	C++17	65 / 100	1095 ms	31108 KiB

bootfall

#include <bits/stdc++.h>
 
using namespace std ;
 
#define int int64_t //be careful about this 
#define endl "\n"
#define f(i,a,b) for(int i=int(a);i<int(b);++i)
 
#define pr pair
#define ar array
#define fr first
#define sc second
#define vt vector
#define pb push_back
#define eb emplace_back
#define LB lower_bound  
#define UB upper_bound
#define PQ priority_queue
 
#define sz(x) ((int)(x).size())
#define all(a) (a).begin(),(a).end()
#define allr(a) (a).rbegin(),(a).rend()
#define mem0(a) memset(a, 0, sizeof(a))
#define mem1(a) memset(a, -1, sizeof(a))
 
template<class A> void rd(vt<A>& v);
template<class T> void rd(T& x){ cin >> x; }
template<class H, class... T> void rd(H& h, T&... t) { rd(h) ; rd(t...) ;}
template<class A> void rd(vt<A>& x) { for(auto& a : x) rd(a) ;}
 
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
 
template<typename T>
void __p(T a) {
  cout<<a; 
}
template<typename T, typename F>
void __p(pair<T, F> a) {
  cout<<"{";
  __p(a.first);
  cout<<",";
  __p(a.second);
  cout<<"}\n"; 
}
template<typename T>
void __p(std::vector<T> a) {
  cout<<"{";
  for(auto it=a.begin(); it<a.end(); it++)
    __p(*it),cout<<",}\n"[it+1==a.end()]; 
}
template<typename T, typename ...Arg>
void __p(T a1, Arg ...a) {
  __p(a1);
  __p(a...);
}
template<typename Arg1>
void __f(const char *name, Arg1 &&arg1) {
  cout<<name<<" : ";
  __p(arg1);
  cout<<endl;
}
template<typename Arg1, typename ... Args>
void __f(const char *names, Arg1 &&arg1, Args &&... args) {
  int bracket=0,i=0;
  for(;; i++)
    if(names[i]==','&&bracket==0)
      break;
    else if(names[i]=='(')
      bracket++;
    else if(names[i]==')')
      bracket--;
  const char *comma=names+i;
  cout.write(names,comma-names)<<" : ";
  __p(arg1);
  cout<<" | ";
  __f(comma+1,args...);
}
 
void setIO(string s = "") {
  ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); 
  cin.exceptions(cin.failbit); 
	cout.precision(15);	cout << fixed;
  #ifdef ONLINE_JUDGE
  if(sz(s)){
  	freopen((s+".in").c_str(),"r",stdin);
  	freopen((s+".out").c_str(),"w",stdout);
  }
  #define __f(...) 0
  #endif
}
const int N = 500 + 1;
bitset<N*N> ans, EMPTY, now, can, check, L[N], R[N];;
signed main(){
  setIO() ;
  int n; rd(n);
  vt<int> a(n);
  for(auto& i : a) cin >> i;
  int total = accumulate(all(a),0);
  
  {
  	check[0] = true;
  	for(auto i : a){
  		check |= check << i;
  	}
  	if(total%2 == 1 || !check[total/2]){
  		cout << 0; exit(0);
  	}
  }
  
  for(int i = 0; i < N*N; ++i){
  	ans[i] = true;	
  }
  
  L[0][0] = 1;
  for(int i = 1; i < n; ++i){
  	L[i] = L[i-1] | (L[i-1] << a[i-1]);
  }
  
  R[n-1][0] = 1;
  for(int i = n-2; i >= 0; --i){
  	R[i] = R[i+1] | (R[i+1] << a[i+1]);
  }
  
  // optimization for to get runtime/2 
  for(int i = 0; i < n; ++i){
  	if(i < n/2){
  		now = R[i]; 
  		for(int j = 0; j < i; ++j){
  			now |= now << a[j];
  		}	
  	}else{
  		now = L[i];
  		for(int j = i+1; j < n; ++j){
  			now |= now << a[j];
  		}	
  	}
  	
  	int sum = total - a[i];
  	can = EMPTY;
  	for(int i = now._Find_first(); i < int(now.size()); i = now._Find_next(i)){
  		int j = abs(2*i - sum);
  		can[j] = true;
  	}
  	ans &= can;
  }
  cout << int(ans.count()) << endl;
  for(int i = ans._Find_first(); i < int(ans.size()); i = ans._Find_next(i)){
  		cout << i << ' ';
  }
}

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