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Submission #745320

# Submission time Handle Problem Language Result Execution time Memory
745320 2023-05-19T21:07:14 Z rainboy Exam (eJOI20_exam) C
77 / 100
 110 ms 98320 KB 
#include <stdio.h>

#define N	100000
#define N_	5000

int max(int a, int b) { return a > b ? a : b; }

int main() {
	static int aa[N], bb[N], qu[N], pp[N], qq[N], dp[N_][N_];
	int n, cnt, same, i, j, b, k, good;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	for (i = 0; i < n; i++)
		scanf("%d", &bb[i]);
	same = 1;
	for (i = 1; i < n; i++)
		if (bb[i] != bb[i - 1]) {
			same = 0;
			break;
		}
	if (same) {
		b = bb[0], k = 0;
		for (i = 0; i < n; i++)
			if (aa[i] <= b) {
				j = i;
				good = 0;
				while (j < n && aa[j] <= b)
					if (aa[j++] == b)
						good = 1;
				if (good)
					k += j - i;
				i = j;
			}
		printf("%d\n", k);
		return 0;
	}
	cnt = 0;
	for (i = 0; i < n; i++) {
		while (cnt && aa[qu[cnt - 1]] <= aa[i])
			cnt--;
		pp[i] = cnt ? qu[cnt - 1] : -1;
		qu[cnt++] = i;
	}
	cnt = 0;
	for (i = n - 1; i >= 0; i--) {
		while (cnt && aa[qu[cnt - 1]] <= aa[i])
			cnt--;
		qq[i] = cnt ? qu[cnt - 1] : n;
		qu[cnt++] = i;
	}
	if (n <= N_) {
		for (i = 0; i < n; i++)
			for (j = 0; j < n; j++)
				dp[i][j] = max(i == 0 ? 0 : dp[i - 1][j], (j == 0 ? 0 : dp[i][j - 1]) + (aa[i] == bb[j] && pp[i] < j && j < qq[i] ? 1 : 0));
		printf("%d\n", dp[n - 1][n - 1]);
	}
	return 0;
}

Compilation message

exam.c: In function 'main':
exam.c:12:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
exam.c:14:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~
exam.c:16:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |   scanf("%d", &bb[i]);
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 292 KB Output is correct

Subtask #2
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 6 ms 336 KB Output is correct
3 Correct 18 ms 968 KB Output is correct
4 Correct 17 ms 1044 KB Output is correct
5 Correct 26 ms 1008 KB Output is correct
6 Correct 16 ms 976 KB Output is correct
7 Correct 18 ms 1004 KB Output is correct
8 Correct 25 ms 1180 KB Output is correct

Subtask #3
13.0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 2 ms 3284 KB Output is correct
3 Correct 16 ms 24020 KB Output is correct
4 Correct 60 ms 94396 KB Output is correct
5 Correct 65 ms 98252 KB Output is correct
6 Correct 66 ms 98320 KB Output is correct

Subtask #4
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 340 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 292 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 1 ms 468 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 1192 KB Output is correct
11 Correct 1 ms 1236 KB Output is correct
12 Correct 1 ms 1236 KB Output is correct
13 Correct 1 ms 1236 KB Output is correct
14 Correct 1 ms 1236 KB Output is correct

Subtask #6
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 292 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 2 ms 3284 KB Output is correct
9 Correct 16 ms 24020 KB Output is correct
10 Correct 60 ms 94396 KB Output is correct
11 Correct 65 ms 98252 KB Output is correct
12 Correct 66 ms 98320 KB Output is correct
13 Correct 0 ms 340 KB Output is correct
14 Correct 1 ms 468 KB Output is correct
15 Correct 1 ms 724 KB Output is correct
16 Correct 1 ms 1192 KB Output is correct
17 Correct 1 ms 1236 KB Output is correct
18 Correct 1 ms 1236 KB Output is correct
19 Correct 1 ms 1236 KB Output is correct
20 Correct 1 ms 1236 KB Output is correct
21 Correct 1 ms 1236 KB Output is correct
22 Correct 5 ms 8180 KB Output is correct
23 Correct 2 ms 340 KB Output is correct
24 Correct 110 ms 98240 KB Output is correct
25 Correct 73 ms 98220 KB Output is correct
26 Correct 68 ms 98252 KB Output is correct
27 Correct 68 ms 98224 KB Output is correct
28 Correct 71 ms 98252 KB Output is correct
29 Correct 69 ms 98300 KB Output is correct
30 Correct 65 ms 98288 KB Output is correct
31 Correct 66 ms 98220 KB Output is correct
32 Correct 67 ms 98220 KB Output is correct