oj.uz

Submission #240517

# Submission time Handle Problem Language Result Execution time Memory
240517 2020-06-19T18:59:23 Z ruler Skyscraper (JOI16_skyscraper) C++14
100 / 100
 157 ms 56824 KB 
// IOI 2021
#include <bits/stdc++.h>
using namespace std;

#define endl '\n'
#define ends ' '
#define die(x) return cout << x << endl, 0
#define all(v) v.begin(), v.end()
#define sz(x) (int)(x.size())
void debug_out() { cerr << endl; }
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) { cerr << ends << H; debug_out(T...); }
#define debug(...) cerr << "{" << #__VA_ARGS__ << "}:", debug_out(__VA_ARGS__)
typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll MOD = 1e9 + 7;
 
////////////////////////////////////////////////////////////////////

const int N = 1e2 + 5, L = 1e3 + 5;

int A[N], DP[N][N][L][3];

void Add(int &x, int y) {
	x += y;
	if (x >= MOD) x -= MOD;
}
int SMul(int x, int y) { return 1LL * x * y % MOD; }

int main() {

	ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
	mt19937 Rnd(time(0));

	int n, l; cin >> n >> l;
	for (int i = 1; i <= n; i++) cin >> A[i];
	if (n == 1) die(1);
	sort(A + 1, A + n + 1);
	DP[1][0][0][1] = 2, DP[1][0][0][2] = 1;
	for (int i = 1; i <= n; i++) for (int j = 0; j <= i; j++) for (int s = 0; s <= l; s++) for (int c = 0; c < 3; c++) {
		int x = A[i + 1] - A[i], y = 2 * j + c, d = s + x * y, p = DP[i][j][s][c];
		if (d >= L || j + c == 0) continue;
		if (j) {
			Add(DP[i + 1][j - 1][d][c], SMul(j, p));
			Add(DP[i + 1][j][d][c], SMul(j << 1, p));
			Add(DP[i + 1][j + 1][d][c], SMul(j, p));
		}
		if (c) {
			Add(DP[i + 1][j][d][c - 1], SMul(c, p));
			Add(DP[i + 1][j][d][c], SMul(c, p));
			Add(DP[i + 1][j + 1][d][c - 1], SMul(c, p));
			Add(DP[i + 1][j + 1][d][c], SMul(c, p));
		}
	}
	int ans = 0;
	for (int i = 0; i <= l; i++) Add(ans, DP[n][0][i][0]);
	cout << ans << endl;

	return 0;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 640 KB Output is correct
5 Correct 6 ms 896 KB Output is correct
6 Correct 6 ms 896 KB Output is correct
7 Correct 5 ms 768 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 6 ms 896 KB Output is correct
10 Correct 5 ms 640 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 896 KB Output is correct
2 Correct 6 ms 1152 KB Output is correct
3 Correct 5 ms 1024 KB Output is correct
4 Correct 6 ms 1152 KB Output is correct
5 Correct 6 ms 1280 KB Output is correct
6 Correct 6 ms 1152 KB Output is correct
7 Correct 5 ms 1024 KB Output is correct
8 Correct 5 ms 1024 KB Output is correct
9 Correct 5 ms 1024 KB Output is correct
10 Correct 5 ms 1152 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 5 ms 384 KB Output is correct
4 Correct 5 ms 640 KB Output is correct
5 Correct 6 ms 896 KB Output is correct
6 Correct 6 ms 896 KB Output is correct
7 Correct 5 ms 768 KB Output is correct
8 Correct 5 ms 640 KB Output is correct
9 Correct 6 ms 896 KB Output is correct
10 Correct 5 ms 640 KB Output is correct
11 Correct 5 ms 896 KB Output is correct
12 Correct 6 ms 1152 KB Output is correct
13 Correct 5 ms 1024 KB Output is correct
14 Correct 6 ms 1152 KB Output is correct
15 Correct 6 ms 1280 KB Output is correct
16 Correct 6 ms 1152 KB Output is correct
17 Correct 5 ms 1024 KB Output is correct
18 Correct 5 ms 1024 KB Output is correct
19 Correct 5 ms 1024 KB Output is correct
20 Correct 5 ms 1152 KB Output is correct
21 Correct 8 ms 4608 KB Output is correct
22 Correct 116 ms 38648 KB Output is correct
23 Correct 136 ms 46076 KB Output is correct
24 Correct 157 ms 54520 KB Output is correct
25 Correct 147 ms 45764 KB Output is correct
26 Correct 145 ms 48504 KB Output is correct
27 Correct 73 ms 37244 KB Output is correct
28 Correct 85 ms 40568 KB Output is correct
29 Correct 143 ms 56824 KB Output is correct
30 Correct 138 ms 45688 KB Output is correct