oj.uz

Submission #428715

# Submission time Handle Problem Language Result Execution time Memory
428715 2021-06-15T14:02:16 Z shenxy Sparklers (JOI17_sparklers) C++11
0 / 100
 37 ms 8132 KB 
#include <cstdio>
#include <algorithm>
#include <cstring>
using namespace std;
const long long INF = 1LL << 60;
int N, K;
long long T, X[1000], m, dpt[1000][1000];
long long dp(int a, int b) {
	if (a == K - 1 && b == K - 1) return 2 * m * T;
	if (a == b) return -INF;
	if (dpt[a][b] != -1) return dpt[a][b];
	return dpt[a][b] = max(dp(a + 1, b) + (X[a] - X[a + 1]) / 2 < 0 ? -INF : dp(a + 1, b) + (X[a] - X[a + 1]) / 2, dp(a, b - 1) + (X[b - 1] - X[b]) / 2 < 0 ? -INF : dp(a, b - 1) + (X[b - 1] - X[b]) / 2) + 2 * m * T;
}
int main() {
	scanf("%d %d %lld", &N, &K, &T);
	for (int i = 0; i < N; ++i) scanf("%lld", &X[i]), X[i] *= 2;
	long long l = 1, u = 10000000000 / T;
	while (l != u) {
		m = (l + u) / 2;
		memset(dpt, -1, sizeof dpt);
		if (dp(0, N - 1) < 0) l = m + 1;
		else u = m;
	}
	printf("%lld", l);
	return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  scanf("%d %d %lld", &N, &K, &T);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:16:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |  for (int i = 0; i < N; ++i) scanf("%lld", &X[i]), X[i] *= 2;
      |                              ~~~~~^~~~~~~~~~~~~~~

Subtask #1
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 8100 KB Output is correct
2 Correct 26 ms 8096 KB Output is correct
3 Correct 30 ms 8012 KB Output is correct
4 Correct 37 ms 8088 KB Output is correct
5 Correct 24 ms 8100 KB Output is correct
6 Correct 24 ms 8012 KB Output is correct
7 Correct 23 ms 8056 KB Output is correct
8 Correct 26 ms 8100 KB Output is correct
9 Correct 24 ms 8012 KB Output is correct
10 Correct 27 ms 8100 KB Output is correct
11 Correct 23 ms 8104 KB Output is correct
12 Correct 24 ms 8104 KB Output is correct
13 Correct 26 ms 8132 KB Output is correct
14 Correct 25 ms 8012 KB Output is correct
15 Correct 36 ms 8012 KB Output is correct
16 Correct 27 ms 8084 KB Output is correct
17 Correct 26 ms 8104 KB Output is correct
18 Correct 28 ms 8012 KB Output is correct
19 Incorrect 22 ms 8104 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 8100 KB Output is correct
2 Correct 26 ms 8096 KB Output is correct
3 Correct 30 ms 8012 KB Output is correct
4 Correct 37 ms 8088 KB Output is correct
5 Correct 24 ms 8100 KB Output is correct
6 Correct 24 ms 8012 KB Output is correct
7 Correct 23 ms 8056 KB Output is correct
8 Correct 26 ms 8100 KB Output is correct
9 Correct 24 ms 8012 KB Output is correct
10 Correct 27 ms 8100 KB Output is correct
11 Correct 23 ms 8104 KB Output is correct
12 Correct 24 ms 8104 KB Output is correct
13 Correct 26 ms 8132 KB Output is correct
14 Correct 25 ms 8012 KB Output is correct
15 Correct 36 ms 8012 KB Output is correct
16 Correct 27 ms 8084 KB Output is correct
17 Correct 26 ms 8104 KB Output is correct
18 Correct 28 ms 8012 KB Output is correct
19 Incorrect 22 ms 8104 KB Output isn't correct
20 Halted 0 ms 0 KB -

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 23 ms 8100 KB Output is correct
2 Correct 26 ms 8096 KB Output is correct
3 Correct 30 ms 8012 KB Output is correct
4 Correct 37 ms 8088 KB Output is correct
5 Correct 24 ms 8100 KB Output is correct
6 Correct 24 ms 8012 KB Output is correct
7 Correct 23 ms 8056 KB Output is correct
8 Correct 26 ms 8100 KB Output is correct
9 Correct 24 ms 8012 KB Output is correct
10 Correct 27 ms 8100 KB Output is correct
11 Correct 23 ms 8104 KB Output is correct
12 Correct 24 ms 8104 KB Output is correct
13 Correct 26 ms 8132 KB Output is correct
14 Correct 25 ms 8012 KB Output is correct
15 Correct 36 ms 8012 KB Output is correct
16 Correct 27 ms 8084 KB Output is correct
17 Correct 26 ms 8104 KB Output is correct
18 Correct 28 ms 8012 KB Output is correct
19 Incorrect 22 ms 8104 KB Output isn't correct
20 Halted 0 ms 0 KB -