Submission #734077

#	Time	Username	Problem	Language	Result	Execution time	Memory
734077		Amaarsaa	Pancake (NOI12_pancake)	C++14	12 / 25	21 ms	304 KiB

pancake

#include<bits/stdc++.h>

using namespace std;
using ll = long long;
ll n, ans, p, j, s;
void Dfs(ll a[], ll  moves) {
	if ( moves < ans) return;
	if ( moves == 0) return ;
	s = n;
	
	for (ll i = 1; i <= n; i ++) {
		if ( a[i] == (n - i + 1)) s --;
	}
	if ( s == 0) {
		ans =moves;
		return;
	}
	for (ll i = 1; i <= n; i ++) {
		reverse(a + i,a +n + 1);
		Dfs(a, moves - 1);
		reverse(a + i, a + n + 1);
	}
	return ;
}
int main() {
	ll i, t, r;
	cin >> t;
	
	while ( t --) {
		cin >> n;
		ans = 0;
		ll a[n + 2], b[n + 2];
		vector < pair < ll, ll > > v;
		for (i = 1; i <= n; i ++) {
			cin >> a[i];
			v.push_back(make_pair(a[i], i));
		}
		sort (v.begin(), v.end());
		for ( i = 0; i < n; i ++) {
			a[v[i].second ] = i + 1;
		}
		for ( i = 1; i <= n; i ++) {
			if ( a[i] != (n - i + 1)) {
				for ( j = i; j <= n; j ++) {
					if ( a[j] == n - i + 1) r= j;
				}
				
				if ( r == n) ans ++;
				else ans += 2;
				reverse(a + r , a + n + 1);
				reverse(a + i, a + n + 1);
			}
		}
		for ( i = 1; i <= n; i ++) a[i] = b[i];
		Dfs(a, 0);
		cout << ans << endl;
	}
}

Compilation message (stderr)

pancake.cpp: In function 'int main()':
pancake.cpp:50:17: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   50 |     reverse(a + r , a + n + 1);
      |                 ^

• Subtask 1: 4 / 4
• Subtask 2: 4 / 4
• Subtask 3: 4 / 4
• Subtask 4: 0 / 8
• Subtask 5: 0 / 5