Submission #343809

#	Time	Username	Problem	Language	Result	Execution time	Memory
343809		Kalashnikov	Bootfall (IZhO17_bootfall)	C++17	0 / 100	1 ms	364 KiB

bootfall

#include <bits/stdc++.h>
 
#define ios ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define file(s) if (fopen(s".in", "r")) freopen(s".in", "r", stdin), freopen(s".out", "w", stdout)
#define all(a) a.begin() , a.end()
#define F first
#define S second
 
using namespace std;
using ll = long long;
 
const int N = 500+5 , inf = 2e9 + 7;
const ll INF = 1e18 ,   mod = 1e9+7 , P = 6547;

int a[N];
bitset<500*250>  b1 , b2 , b3;


void solve() {
	int n;
	cin >> n;
	int sum = 0;
	int cnt[2];
	cnt[0]=cnt[1]=0;
	for(int i = 1; i <= n; i ++) {
		cin >> a[i];
		sum += a[i];
		cnt[a[i]%2] = 1;
	}
	if(sum%2 || cnt[0]==cnt[1]) {
		cout << 0;
		return;
	}
	for(int i = 0; i <= n; i ++) {
		b3.reset();
		for(int j = 1; j <= n; j ++) {
			if(i == j) continue;
			if(i == 0) {
				b2 |= (b2 << a[j]);
				b2[a[j]] = 1;
			}
			else {
				b3 |= (b3 << a[j]);
				b3[a[j]] = 1;
			}
		}
		if(i) b3 <<= a[i]/2;
		if(i == 1) b1 = b3;
		if(i > 1) b1 &= b3;
	}
	if(!b2[sum/2]) {
		cout << 0;
		return;
	}
	cout << b2.count() << '\n';
	for(int i = 0; i < b2.size(); i ++) {
		if(b2[i]) {
			cout << i*2-sum << ' ';
		}
	}
}
/*
1 2 1 2   2


*/
main() {
    ios;
    int tt = 1;
    //cin >> tt;
    while(tt --) {
        solve();
    }
    return 0;
}

Compilation message (stderr)

bootfall.cpp: In function 'void solve()':
bootfall.cpp:56:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::size_t' {aka 'long unsigned int'} [-Wsign-compare]
   56 |  for(int i = 0; i < b2.size(); i ++) {
      |                 ~~^~~~~~~~~~~
bootfall.cpp: At global scope:
bootfall.cpp:67:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   67 | main() {
      |      ^

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