Submission #343263

#	Time	Username	Problem	Language	Result	Execution time	Memory
343263		sinamhdv	Skyscraper (JOI16_skyscraper)	C++11	15 / 100	779 ms	214636 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int mod = 1000 * 1000 * 1000 + 7;
const int INF = 1000 * 1000 * 1000;
const ll LINF = (ll)INF * INF;

#ifdef DEBUG
#define dbg(x) cout << #x << " = " << (x) << endl << flush;
#define dbgr(s, f) { cout << #s << ": "; for (auto _ = (s); _ != (f); _++) cout << *_ << ' '; cout << endl << flush; }
#else
#define dbg(x) ;
#define dbgr(s, f) ;
#endif
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define fast_io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define msub(a, b) ((mod + ((ll)(a) - (b)) % mod) % mod)
#define mdiv(a, b) ((ll)(a) * poww((b), mod - 2) % mod)
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define endl '\n'

#define MAXN 16
#define MAXL 110

ll dp[1 << MAXN][MAXN][MAXL];
int n, L;
int a[MAXN];

int32_t main(void)
{
	fast_io;
	cin >> n >> L;
	FOR(i, 0, n)
		cin >> a[i];
	FOR(i, 0, n)
	{
		dp[1 << i][i][0] = 1;
	}
	FOR(mask, 1, 1 << n)
	{
		if (__builtin_popcount(mask) == 1)
			continue;
		FOR(l, 0, L + 1)
		{
			FOR(i, 0, n)
			{
				if (!(mask & (1 << i)))
					continue;
				int nmask = mask ^ (1 << i);
				FOR(j, 0, n)
				{
					if (!(nmask & (1 << j)) || abs(a[i] - a[j]) > l)
						continue;
					dp[mask][i][l] = (dp[mask][i][l] + dp[nmask][j][l - abs(a[i] - a[j])]) % mod;
				}
			}
		}
	}
	ll ans = 0;
	FOR(i, 0, n)
	{
		FOR(j, 0, L + 1)
		{
			ans = (ans + dp[(1 << n) - 1][i][j]) % mod;
		}
	}
	cout << ans << endl;
	return 0;
}

• Subtask 1: 0 / 5
• Subtask 2: 15 / 15
• Subtask 3: 0 / 80