Submission #532895

#	Time	Username	Problem	Language	Result	Execution time	Memory
532895		hhhhaura	Cheerleaders (info1cup20_cheerleaders)	C++14	51 / 100	2085 ms	1868 KiB

cheerleaders

#define wiwihorz
#include <bits/stdc++.h>
#pragma GCC optimize("Ofast")
#pragma GCC target("sse")
#pragma loop-opt(on)
#define rep(i, a, b) for(int i = a; i <= b; i ++)
#define rrep(i, a, b) for(int i = b; i >= a; i--)
#define ceil(a, b) ((a + b - 1) / (b))
#define all(x) x.begin(), x.end()
#define lld long double
#define pii pair<int, int>
#define random mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count())
using namespace std;
#define INF 1000000000
#define MOD 1000000007
#define eps (1e-9)

#ifdef wiwihorz
#define print(a...) cerr<<"Line "<<__LINE__<<":",kout("[" + string(#a) + "] = ", a)
void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L)==R], ++L;}
void kout() { cerr << endl; }
template<class T1, class ... T2> void kout(T1 a, T2 ... e) { cerr << a << " ", kout(e...);} 
#else
#define print(...) 0
#define vprint(...) 0
#endif
#define x first
#define y second
struct BIT {
	int n;
	vector<int> v;
	void init_(int _n) {
		n = _n;
		v.assign(n + 1, 0);
	}
	int lowbit(int x) {
		return x & (-x);
	}
	void modify(int x, int val) {
		for(int i = x; i <= n; i += lowbit(i)) {
			v[i] += val;
		}
	}
	int query(int x) {
		int ans = 0;
		for(int i = x; i > 0; i -= lowbit(i)) {
			ans += v[i];
		}
		return ans;
	}
};
namespace solver {
	int n, tot;
	BIT bit;
	vector<int> a, b;
	void init_(int _n) {
		n = _n, tot = 1 << n;
		a.assign(tot, 0);
		b.assign(tot, 0);
	}
	int cal() {
		bit.init_(tot);
		int ans = 0;
		rrep(i, 0, tot - 1) {
			int val = a[b[i]] + 1;
			ans += bit.query(val - 1);
			bit.modify(val, 1);
		}
		return ans;
	}
	void solve() {
		int ans = INF;
		pii opt;
		if(n == 0) {
			cout << 0 <<"\n";
			return;
		}
		rep(i, 0, tot - 1) rep(j, 0, n - 1) {
			rep(x, 0, tot - 1) b[x] = 0;
			rep(x, 0, tot - 1) rep(y, 0, n - 1) {
				int to = (j + y >= n ? j + y - n : j + y);
				b[x] |= ((((x >> to) & 1) ^ ((i >> y) & 1)) << y);
			}
			int val = cal();
			if(val < ans) ans = val, opt = {i, j};
		}
		cout << ans << "\n";
		string s = "2";
		rep(i, 0, n - 1) {
			if((opt.x >> i) & 1) s += "1";
			s += "2";
		}
		rep(i, 1, n - 1 - opt.y) s += "2";
		cout << s << "\n";
	}
};
using namespace solver;
signed main() {
	ios::sync_with_stdio(false), cin.tie(0);
	int n; cin >> n;
	init_(n);
	rep(i, 0, (1 << n) - 1) cin >> a[i];
	solve();
	return 0;
}

Compilation message (stderr)

cheerleaders.cpp:5: warning: ignoring '#pragma loop ' [-Wunknown-pragmas]
    5 | #pragma loop-opt(on)
      | 
cheerleaders.cpp:20:13: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L)==R], ++L;}
      |             ^~~~
cheerleaders.cpp:20:21: warning: use of 'auto' in parameter declaration only available with '-fconcepts-ts'
   20 | void vprint(auto L, auto R) { while(L < R) cerr << *L << " \n"[next(L)==R], ++L;}
      |                     ^~~~

• Subtask 1: 16 / 16
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 0 / 21
• Subtask 5: 0 / 28