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Submission #1060287

# Submission time Handle Problem Language Result Execution time Memory
1060287 2024-08-15T12:39:34 Z rainboy Sprinklers (CEOI24_sprinklers) C
9 / 100
 56 ms 4004 KB 
#include <stdio.h>
#include <string.h>

#define N	100000
#define M	100000
#define X	1000000001

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

char cc[N + 1]; int xx[N + 2], yy[M], n, m;

int solve(int d) {
	static int dp[N + 2], pp[N + 2];
	int i, i_, i1, j, x, y;

	memset(dp, -1, (n + 2) * sizeof *dp);
	dp[0] = 0;
	for (i = 0, i_ = 0, j = 0; i <= n; i++) {
		if (dp[i] == -1)
			return 0;
		while (j < m && yy[j] < xx[i])
			j++;
		x = max(xx[i], xx[dp[i]] + d), y = -1;
		while (j < m && yy[j] < xx[i + 1]) {
			if (yy[j] > x) {
				y = yy[j];
				break;
			}
			j++;
		}
		if (y == -1)
			dp[i + 1] = i + 1, pp[i + 1] = i;
		else {
			i_ = max(i_, i + 1);
			while (i_ <= n + 1 && y >= xx[i_] - d) {
				i1 = i_ == i + 1 ? dp[i] : i_ - 1;
				if (dp[i_] < i1)
					dp[i_] = i1, pp[i_] = i;
				i_++;
			}
		}
	}
	if (dp[n + 1] == -1)
		return 0;
	i = n;
	while (i > 0)
		if (pp[i] == i - 1)
			cc[i - 1] = dp[i] == i ? 'R' : 'L', i--;
		else {
			cc[--i] = 'L';
			while (i > pp[i])
				cc[--i] = 'R';
		}
	return 1;
}

int main() {
	int m_, i, y, d, lower, upper;

	scanf("%d%d", &n, &m);
	xx[0] = -X - 1, xx[n + 1] = X * 2 + 1;
	for (i = 1; i <= n; i++)
		scanf("%d", &xx[i]);
	m_ = 0, i = 0;
	while (m--) {
		scanf("%d", &y);
		while (xx[i] < y)
			i++;
		if (xx[i] != y)
			yy[m_++] = y;
	}
	m = m_;
	lower = -1, upper = X;
	while (upper - lower > 1) {
		d = (lower + upper) / 2;
		if (solve(d))
			upper = d;
		else
			lower = d;
	}
	if (upper == X) {
		printf("-1\n");
		return 0;
	}
	solve(upper);
	printf("%d\n", upper);
	printf("%s\n", cc);
	return 0;
}

Compilation message

Main.c: In function 'main':
Main.c:60:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
Main.c:63:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   63 |   scanf("%d", &xx[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:66:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |   scanf("%d", &y);
      |   ^~~~~~~~~~~~~~~

Subtask #0
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 0 ms 348 KB Correct

Subtask #1
3.0 / 3.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 8 ms 1368 KB Correct
3 Correct 0 ms 348 KB Correct
4 Correct 9 ms 1636 KB Correct
5 Correct 19 ms 1624 KB Correct
6 Correct 0 ms 344 KB Correct
7 Correct 0 ms 348 KB Correct
8 Correct 4 ms 604 KB Correct
9 Correct 0 ms 348 KB Correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 10 ms 1628 KB Correct
3 Correct 3 ms 600 KB Correct
4 Correct 31 ms 4004 KB Correct
5 Correct 51 ms 3924 KB Correct
6 Correct 0 ms 348 KB Correct
7 Correct 1 ms 348 KB Correct
8 Correct 25 ms 3736 KB Correct
9 Correct 22 ms 3676 KB Correct
10 Correct 42 ms 3956 KB Correct
11 Correct 33 ms 2660 KB Correct
12 Correct 32 ms 2392 KB Correct
13 Correct 30 ms 2908 KB Correct
14 Correct 56 ms 3164 KB Correct
15 Correct 32 ms 3356 KB Correct
16 Correct 33 ms 2852 KB Correct

Subtask #3
0.0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 0 ms 348 KB Correct
3 Correct 1 ms 348 KB Correct
4 Correct 0 ms 348 KB Correct
5 Incorrect 1 ms 348 KB User solution is incorrect
6 Halted 0 ms 0 KB -

Subtask #4
0.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 14 ms 1944 KB Correct
3 Incorrect 55 ms 3948 KB User solution is incorrect
4 Halted 0 ms 0 KB -

Subtask #5
0.0 / 47.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 KB Correct
2 Correct 0 ms 348 KB Correct
3 Correct 8 ms 1368 KB Correct
4 Correct 0 ms 348 KB Correct
5 Correct 9 ms 1636 KB Correct
6 Correct 19 ms 1624 KB Correct
7 Correct 0 ms 344 KB Correct
8 Correct 0 ms 348 KB Correct
9 Correct 4 ms 604 KB Correct
10 Correct 0 ms 348 KB Correct
11 Correct 10 ms 1628 KB Correct
12 Correct 3 ms 600 KB Correct
13 Correct 31 ms 4004 KB Correct
14 Correct 51 ms 3924 KB Correct
15 Correct 0 ms 348 KB Correct
16 Correct 1 ms 348 KB Correct
17 Correct 25 ms 3736 KB Correct
18 Correct 22 ms 3676 KB Correct
19 Correct 42 ms 3956 KB Correct
20 Correct 33 ms 2660 KB Correct
21 Correct 32 ms 2392 KB Correct
22 Correct 30 ms 2908 KB Correct
23 Correct 56 ms 3164 KB Correct
24 Correct 32 ms 3356 KB Correct
25 Correct 33 ms 2852 KB Correct
26 Correct 1 ms 348 KB Correct
27 Correct 0 ms 348 KB Correct
28 Incorrect 1 ms 348 KB User solution is incorrect
29 Halted 0 ms 0 KB -