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Submission #491080

# Submission time Handle Problem Language Result Execution time Memory
491080 2021-11-30T13:19:23 Z rainboy Ljetopica (COI19_ljetopica) C
100 / 100
 65 ms 304 KB 
#include <stdio.h>
#include <string.h>

#define N	1000
#define MD	1000000007

int pp2[N + 1];

void init() {
	int i;

	pp2[0] = 1;
	for (i = 1; i <= N; i++)
		pp2[i] = pp2[i - 1] * 2 % MD;
}

int solve(char *aa, char *cc, int n, int k, int lt) {
	static char bb[N + 1];
	static int dp[N + 1][2], dq[N + 1][2];
	int i, j;

	bb[0] = '1';
	for (i = 0; i < n - 1; i++)
		bb[i + 1] = cc[i] == 'L' ? '0' : '1';
	for (j = 0; j <= k; j++)
		dp[j][0] = dp[j][1] = 0, dq[j][0] = dq[j][1] = 0;
	dp[0][0] = 1, dq[0][0] = 0;
	for (i = 0; i < n; i++) {
		int a = aa[i] - '0', b = bb[i] - '0';

		for (j = k; j >= 0; j--) {
			int x0 = dp[j][0], y0 = dq[j][0], x1 = dp[j][1], y1 = dq[j][1], b_;

			dp[j][0] = dp[j][1] = dq[j][0] = dq[j][1] = 0;
			b_ = b ^ j % 2;
			if (b_ != a) {
				dp[j][1] = (dp[j][1] + x1) % MD;
				dq[j][1] = (dq[j][1] + y1 + (long long) pp2[n - 1 - i] * x1 % MD * b_) % MD;
				if (b_ < a) {
					dp[j][1] = (dp[j][1] + x0) % MD;
					dq[j][1] = (dq[j][1] + y0 + (long long) pp2[n - 1 - i] * x0 % MD * b_) % MD;
				}
			} else {
				dp[j][0] = (dp[j][0] + x0) % MD;
				dq[j][0] = (dq[j][0] + y0 + (long long) pp2[n - 1 - i] * x0 % MD * b_) % MD;
				dp[j][1] = (dp[j][1] + x1) % MD;
				dq[j][1] = (dq[j][1] + y1 + (long long) pp2[n - 1 - i] * x1 % MD * b_) % MD;
			}
			if (j < k) {
				b_ = b ^ (j + 1) % 2;
				if (b_ != a) {
					dp[j + 1][1] = (dp[j + 1][1] + x1) % MD;
					dq[j + 1][1] = (dq[j + 1][1] + y1 + (long long) pp2[n - 1 - i] * x1 % MD * b_) % MD;
					if (b_ < a) {
						dp[j + 1][1] = (dp[j + 1][1] + x0) % MD;
						dq[j + 1][1] = (dq[j + 1][1] + y0 + (long long) pp2[n - 1 - i] * x0 % MD * b_) % MD;
					}
				} else {
					dp[j + 1][0] = (dp[j + 1][0] + x0) % MD;
					dq[j + 1][0] = (dq[j + 1][0] + y0 + (long long) pp2[n - 1 - i] * x0 % MD * b_) % MD;
					dp[j + 1][1] = (dp[j + 1][1] + x1) % MD;
					dq[j + 1][1] = (dq[j + 1][1] + y1 + (long long) pp2[n - 1 - i] * x1 % MD * b_) % MD;
				}
			}
		}
	}
	return (dq[k][1] + (lt ? 0 : dq[k][0])) % MD;
}

int main() {
	static char cc[N + 1], aa[N + 1], bb[N + 1];
	int n, k, i, ans;

	init();
	scanf("%d%d%s%s%s", &n, &k, cc, aa, bb);
	ans = (solve(bb, cc, n, k, 0) - solve(aa, cc, n, k, 1)) % MD;
	for (i = 0; i < n - 1; i++)
		cc[i] = cc[i] == 'L' ? 'R' : 'L';
	ans = ((long long) ans + solve(bb, cc, n, k, 0) - solve(aa, cc, n, k, 1)) % MD;
	if (ans < 0)
		ans += MD;
	printf("%d\n", ans);
	return 0;
}

Compilation message

ljetopica.c: In function 'main':
ljetopica.c:75:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |  scanf("%d%d%s%s%s", &n, &k, cc, aa, bb);
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct

Subtask #2
14.0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 0 ms 280 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 0 ms 288 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 0 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 224 KB Output is correct
11 Correct 0 ms 204 KB Output is correct
12 Correct 0 ms 204 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 0 ms 280 KB Output is correct
15 Correct 0 ms 204 KB Output is correct

Subtask #3
17.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 46 ms 280 KB Output is correct
2 Correct 31 ms 204 KB Output is correct
3 Correct 35 ms 204 KB Output is correct
4 Correct 65 ms 284 KB Output is correct
5 Correct 26 ms 296 KB Output is correct
6 Correct 63 ms 296 KB Output is correct
7 Correct 14 ms 212 KB Output is correct
8 Correct 34 ms 208 KB Output is correct
9 Correct 2 ms 204 KB Output is correct
10 Correct 28 ms 296 KB Output is correct

Subtask #4
61.0 / 61.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 0 ms 204 KB Output is correct
7 Correct 0 ms 204 KB Output is correct
8 Correct 1 ms 204 KB Output is correct
9 Correct 0 ms 204 KB Output is correct
10 Correct 1 ms 204 KB Output is correct
11 Correct 0 ms 280 KB Output is correct
12 Correct 1 ms 204 KB Output is correct
13 Correct 0 ms 288 KB Output is correct
14 Correct 0 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct
16 Correct 0 ms 204 KB Output is correct
17 Correct 0 ms 204 KB Output is correct
18 Correct 1 ms 224 KB Output is correct
19 Correct 0 ms 204 KB Output is correct
20 Correct 0 ms 204 KB Output is correct
21 Correct 0 ms 204 KB Output is correct
22 Correct 0 ms 280 KB Output is correct
23 Correct 0 ms 204 KB Output is correct
24 Correct 46 ms 280 KB Output is correct
25 Correct 31 ms 204 KB Output is correct
26 Correct 35 ms 204 KB Output is correct
27 Correct 65 ms 284 KB Output is correct
28 Correct 26 ms 296 KB Output is correct
29 Correct 63 ms 296 KB Output is correct
30 Correct 14 ms 212 KB Output is correct
31 Correct 34 ms 208 KB Output is correct
32 Correct 2 ms 204 KB Output is correct
33 Correct 28 ms 296 KB Output is correct
34 Correct 49 ms 284 KB Output is correct
35 Correct 18 ms 300 KB Output is correct
36 Correct 33 ms 280 KB Output is correct
37 Correct 58 ms 280 KB Output is correct
38 Correct 9 ms 304 KB Output is correct
39 Correct 60 ms 280 KB Output is correct
40 Correct 7 ms 284 KB Output is correct
41 Correct 35 ms 204 KB Output is correct
42 Correct 50 ms 276 KB Output is correct
43 Correct 42 ms 204 KB Output is correct
44 Correct 49 ms 280 KB Output is correct
45 Correct 14 ms 300 KB Output is correct
46 Correct 39 ms 204 KB Output is correct
47 Correct 40 ms 204 KB Output is correct
48 Correct 23 ms 204 KB Output is correct
49 Correct 2 ms 204 KB Output is correct
50 Correct 46 ms 204 KB Output is correct
51 Correct 21 ms 204 KB Output is correct
52 Correct 23 ms 280 KB Output is correct
53 Correct 58 ms 204 KB Output is correct
54 Correct 16 ms 296 KB Output is correct
55 Correct 45 ms 204 KB Output is correct
56 Correct 53 ms 276 KB Output is correct
57 Correct 5 ms 204 KB Output is correct
58 Correct 44 ms 204 KB Output is correct