oj.uz

Submission #1087519

# Submission time Handle Problem Language Result Execution time Memory
1087519 2024-09-12T20:12:11 Z TAhmed33 Skyscraper (JOI16_skyscraper) C++
20 / 100
 296 ms 244888 KB 
#include <bits/stdc++.h>
using namespace std;
#pragma GCC optimize ("Ofast")
typedef long long ll;
const int MOD = 1e9 + 7;
int add (int a, int b) {
	a += b; if (a >= MOD) a -= MOD;
	return a;
}
int sub (int a, int b) {
	a -= b; if (a < 0) a += MOD;
	return a;
}
int mul (int a, int b) {
	return (a * 1ll * b) % MOD;
}
int power (int a, int b) {
	if (!b) return 1;
	int u = power(a, b >> 1);
	u = mul(u, u);
	if (b & 1) u = mul(u, a);
	return u;
}
int n, l, a[101];
const int B = 1000;
int dp[102][102][2 * B + 1][3];
int ans (int x, int y, int z, int c) {
	if (y < 1 || c < 0 || c > 2 || abs(z) > B) {
		return 0;
	}
	if (x == n + 1) {
		return y == 1 && z >= 0 && z <= l && c == 0;
	}
	int &ret = dp[x][y][z + B][c];
	if (ret != -1) {
		return ret;
	}
	if (y == 1) {
		ret = 0;
		ret = add(ret, mul(c, ans(x + 1, y, z, c)));
		ret = add(ret, mul(c, ans(x + 1, y, z + a[x], c - 1)));
		ret = add(ret, mul(c, ans(x + 1, y + 1, z - 2 * a[x], c)));
		ret = add(ret, mul(c, ans(x + 1, y + 1, z - a[x], c - 1)));
		return ret;
	}
	ret = 0;
	ret = add(ret, mul(c, ans(x + 1, y + 1, z - 2 * a[x], c)));
	ret = add(ret, mul(c, ans(x + 1, y + 1, z - a[x], c - 1)));
	ret = add(ret, mul(c, ans(x + 1, y, z + a[x], c - 1)));
	ret = add(ret, mul(y - 1, ans(x + 1, y + 1, z - 2 * a[x], c)));
	ret = add(ret, mul(y - 1, ans(x + 1, y - 1, z + 2 * a[x], c)));
	ret = add(ret, mul(2 * y - 2 + c, ans(x + 1, y, z, c)));
	return ret;
}
void solve () {
	memset(dp, -1, sizeof(dp));
	cin >> n >> l;
	for (int i = 1; i <= n; i++) {
		cin >> a[i];
	}
	if (n == 1) {
		cout << 1 << '\n';
		return;
	}
	sort(a + 1, a + n + 1);
	int sum = ans(2, 1, -a[1], 1);
	sum = mul(sum, 2);
	sum = add(sum, ans(2, 1, -2 * a[1], 2));
	cout << sum << '\n';
}				
signed main () {
	ios::sync_with_stdio(0); cin.tie(0);
	int tc = 1; //cin >> tc;
	while (tc--) solve();
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 244888 KB Output is correct
2 Correct 105 ms 244828 KB Output is correct
3 Correct 106 ms 244816 KB Output is correct
4 Correct 107 ms 244820 KB Output is correct
5 Correct 105 ms 244784 KB Output is correct
6 Correct 106 ms 244816 KB Output is correct
7 Correct 107 ms 244676 KB Output is correct
8 Correct 110 ms 244848 KB Output is correct
9 Correct 106 ms 244820 KB Output is correct
10 Correct 108 ms 244820 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 105 ms 244820 KB Output is correct
2 Correct 109 ms 244816 KB Output is correct
3 Correct 103 ms 244820 KB Output is correct
4 Correct 120 ms 244744 KB Output is correct
5 Correct 107 ms 244744 KB Output is correct
6 Correct 109 ms 244820 KB Output is correct
7 Correct 112 ms 244820 KB Output is correct
8 Correct 108 ms 244640 KB Output is correct
9 Correct 104 ms 244820 KB Output is correct
10 Correct 118 ms 244640 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 110 ms 244888 KB Output is correct
2 Correct 105 ms 244828 KB Output is correct
3 Correct 106 ms 244816 KB Output is correct
4 Correct 107 ms 244820 KB Output is correct
5 Correct 105 ms 244784 KB Output is correct
6 Correct 106 ms 244816 KB Output is correct
7 Correct 107 ms 244676 KB Output is correct
8 Correct 110 ms 244848 KB Output is correct
9 Correct 106 ms 244820 KB Output is correct
10 Correct 108 ms 244820 KB Output is correct
11 Correct 105 ms 244820 KB Output is correct
12 Correct 109 ms 244816 KB Output is correct
13 Correct 103 ms 244820 KB Output is correct
14 Correct 120 ms 244744 KB Output is correct
15 Correct 107 ms 244744 KB Output is correct
16 Correct 109 ms 244820 KB Output is correct
17 Correct 112 ms 244820 KB Output is correct
18 Correct 108 ms 244640 KB Output is correct
19 Correct 104 ms 244820 KB Output is correct
20 Correct 118 ms 244640 KB Output is correct
21 Correct 133 ms 244816 KB Output is correct
22 Incorrect 296 ms 244884 KB Output isn't correct
23 Halted 0 ms 0 KB -