oj.uz

Submission #46288

# Submission time Handle Problem Language Result Execution time Memory
46288 2018-04-18T19:15:53 Z qoo2p5 Sparklers (JOI17_sparklers) C++17
50 / 100
 206 ms 49788 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int INF = (int) 1e9 + 1e6 + 123;
const ll LINF = (ll) 1e18 + 1e9 + 123;

#define rep(i, s, t) for (auto i = (s); i < (t); ++(i))
#define per(i, s, t) for (auto i = (s); i >= (t); --(i))
#define sz(x) ((int)(x).size())
#define mp make_pair
#define pb push_back

bool mini(auto &x, const auto &y) {
	if (y < x) {
		x = y;
		return 1;
	}
	return 0;
}

bool maxi(auto &x, const auto &y) {
	if (y > x) {
		x = y;
		return 1;
	}
	return 0;
}

void run();

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	run();
	return 0;
}

const int N = 5005;

int n, k;
ll t;
ll x[N], a[N];
bool dp[N][N];

bool check(ll s) {
	memset(dp, 0, sizeof dp);
	dp[k][k] = 1;
	rep(i, 0, n) {
		a[i] = x[i] - 2 * s * t * i;
	}
	rep(len, 2, n + 1) {
		rep(l, 0, n) {
			int r = l + len - 1;
			if (r >= n) {
				break;
			}
			dp[l][r] = ((dp[l + 1][r] || dp[l][r - 1]) && a[l] >= a[r]);
		}
	}
	return dp[0][n - 1];
}

void run() {
	cin >> n >> k >> t;
	k--;
	rep(i, 0, n) {
		cin >> x[i];
	}
	ll left = -1;
	ll right = (x[n - 1] + t) / t;
	
	while (right - left > 1) {
		ll mid = (left + right) / 2;
		if (check(mid)) {
			right = mid;
		} else {
			left = mid;
		}
	}
	
	cout << right << "\n";
}

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 24824 KB Output is correct
2 Correct 71 ms 25064 KB Output is correct
3 Correct 70 ms 25064 KB Output is correct
4 Correct 87 ms 25064 KB Output is correct
5 Correct 79 ms 25064 KB Output is correct
6 Correct 85 ms 25064 KB Output is correct
7 Correct 71 ms 25064 KB Output is correct
8 Correct 89 ms 25064 KB Output is correct
9 Correct 107 ms 25064 KB Output is correct
10 Correct 92 ms 25184 KB Output is correct
11 Correct 65 ms 25184 KB Output is correct
12 Correct 82 ms 25184 KB Output is correct
13 Correct 84 ms 25184 KB Output is correct
14 Correct 67 ms 25184 KB Output is correct
15 Correct 66 ms 25184 KB Output is correct
16 Correct 72 ms 25188 KB Output is correct
17 Correct 80 ms 25188 KB Output is correct
18 Correct 80 ms 25188 KB Output is correct
19 Correct 19 ms 25188 KB Output is correct
20 Correct 85 ms 25188 KB Output is correct
21 Correct 18 ms 25188 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 24824 KB Output is correct
2 Correct 71 ms 25064 KB Output is correct
3 Correct 70 ms 25064 KB Output is correct
4 Correct 87 ms 25064 KB Output is correct
5 Correct 79 ms 25064 KB Output is correct
6 Correct 85 ms 25064 KB Output is correct
7 Correct 71 ms 25064 KB Output is correct
8 Correct 89 ms 25064 KB Output is correct
9 Correct 107 ms 25064 KB Output is correct
10 Correct 92 ms 25184 KB Output is correct
11 Correct 65 ms 25184 KB Output is correct
12 Correct 82 ms 25184 KB Output is correct
13 Correct 84 ms 25184 KB Output is correct
14 Correct 67 ms 25184 KB Output is correct
15 Correct 66 ms 25184 KB Output is correct
16 Correct 72 ms 25188 KB Output is correct
17 Correct 80 ms 25188 KB Output is correct
18 Correct 80 ms 25188 KB Output is correct
19 Correct 19 ms 25188 KB Output is correct
20 Correct 85 ms 25188 KB Output is correct
21 Correct 18 ms 25188 KB Output is correct
22 Correct 111 ms 25196 KB Output is correct
23 Correct 112 ms 25196 KB Output is correct
24 Correct 102 ms 25196 KB Output is correct
25 Correct 164 ms 25256 KB Output is correct
26 Correct 164 ms 25256 KB Output is correct
27 Correct 166 ms 25256 KB Output is correct
28 Correct 176 ms 25256 KB Output is correct
29 Correct 170 ms 25256 KB Output is correct
30 Correct 161 ms 25256 KB Output is correct
31 Correct 203 ms 25256 KB Output is correct
32 Correct 167 ms 25256 KB Output is correct
33 Correct 172 ms 25256 KB Output is correct
34 Correct 201 ms 25256 KB Output is correct
35 Correct 196 ms 25256 KB Output is correct
36 Correct 206 ms 25256 KB Output is correct
37 Correct 173 ms 25256 KB Output is correct
38 Correct 188 ms 25256 KB Output is correct
39 Correct 192 ms 25256 KB Output is correct
40 Correct 20 ms 25256 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 62 ms 24824 KB Output is correct
2 Correct 71 ms 25064 KB Output is correct
3 Correct 70 ms 25064 KB Output is correct
4 Correct 87 ms 25064 KB Output is correct
5 Correct 79 ms 25064 KB Output is correct
6 Correct 85 ms 25064 KB Output is correct
7 Correct 71 ms 25064 KB Output is correct
8 Correct 89 ms 25064 KB Output is correct
9 Correct 107 ms 25064 KB Output is correct
10 Correct 92 ms 25184 KB Output is correct
11 Correct 65 ms 25184 KB Output is correct
12 Correct 82 ms 25184 KB Output is correct
13 Correct 84 ms 25184 KB Output is correct
14 Correct 67 ms 25184 KB Output is correct
15 Correct 66 ms 25184 KB Output is correct
16 Correct 72 ms 25188 KB Output is correct
17 Correct 80 ms 25188 KB Output is correct
18 Correct 80 ms 25188 KB Output is correct
19 Correct 19 ms 25188 KB Output is correct
20 Correct 85 ms 25188 KB Output is correct
21 Correct 18 ms 25188 KB Output is correct
22 Correct 111 ms 25196 KB Output is correct
23 Correct 112 ms 25196 KB Output is correct
24 Correct 102 ms 25196 KB Output is correct
25 Correct 164 ms 25256 KB Output is correct
26 Correct 164 ms 25256 KB Output is correct
27 Correct 166 ms 25256 KB Output is correct
28 Correct 176 ms 25256 KB Output is correct
29 Correct 170 ms 25256 KB Output is correct
30 Correct 161 ms 25256 KB Output is correct
31 Correct 203 ms 25256 KB Output is correct
32 Correct 167 ms 25256 KB Output is correct
33 Correct 172 ms 25256 KB Output is correct
34 Correct 201 ms 25256 KB Output is correct
35 Correct 196 ms 25256 KB Output is correct
36 Correct 206 ms 25256 KB Output is correct
37 Correct 173 ms 25256 KB Output is correct
38 Correct 188 ms 25256 KB Output is correct
39 Correct 192 ms 25256 KB Output is correct
40 Correct 20 ms 25256 KB Output is correct
41 Runtime error 43 ms 49788 KB Execution killed with signal 11 (could be triggered by violating memory limits)
42 Halted 0 ms 0 KB -