import java.util.*;
import java.io.*;
public class ho_t1 {
final static int MOD = 1000000007;
final static int intMax = 1000000000;
final static int intMin = -1000000000;
final static int[] dx = { 0, 0, -1, 1 };
final static int[] dy = { -1, 1, 0, 0 };
static int T;
static class Reader {
final private int BUFFER_SIZE = 1 << 16;
private DataInputStream din;
private byte[] buffer;
private int bufferPointer, bytesRead;
public Reader() {
din = new DataInputStream(System.in);
buffer = new byte[BUFFER_SIZE];
bufferPointer = bytesRead = 0;
}
public Reader(String file_name) throws IOException {
din = new DataInputStream(new FileInputStream(file_name));
buffer = new byte[BUFFER_SIZE];
bufferPointer = bytesRead = 0;
}
public String readLine() throws IOException {
byte[] buf = new byte[360]; // line length
int cnt = 0, c;
while ((c = read()) != -1) {
if (c == '\n')
break;
buf[cnt++] = (byte) c;
}
return new String(buf, 0, cnt);
}
public int nextInt() throws IOException {
int ret = 0;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do {
ret = ret * 10 + c - '0';
} while ((c = read()) >= '0' && c <= '9');
if (neg)
return -ret;
return ret;
}
public long nextLong() throws IOException {
long ret = 0;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do {
ret = ret * 10 + c - '0';
} while ((c = read()) >= '0' && c <= '9');
if (neg)
return -ret;
return ret;
}
public double nextDouble() throws IOException {
double ret = 0, div = 1;
byte c = read();
while (c <= ' ')
c = read();
boolean neg = (c == '-');
if (neg)
c = read();
do {
ret = ret * 10 + c - '0';
} while ((c = read()) >= '0' && c <= '9');
if (c == '.') {
while ((c = read()) >= '0' && c <= '9') {
ret += (c - '0') / (div *= 10);
}
}
if (neg)
return -ret;
return ret;
}
private void fillBuffer() throws IOException {
bytesRead = din.read(buffer, bufferPointer = 0, BUFFER_SIZE);
if (bytesRead == -1)
buffer[0] = -1;
}
private byte read() throws IOException {
if (bufferPointer == bytesRead)
fillBuffer();
return buffer[bufferPointer++];
}
public void close() throws IOException {
if (din == null)
return;
din.close();
}
}
public static void main(String[] args) throws Exception {
Reader in = new Reader();
int N = in.nextInt();
int L = in.nextInt();
int[] X = new int[N + 1];
int[] X2 = new int[N + 1];
int[] T = new int[N];
for(int i = 1; i <= N; ++i) {
X[i] = in.nextInt();
}
for(int i = 0; i < N; ++i) {
T[i] = in.nextInt();
}
for(int i = N; i >= 1; --i) {
X2[N - i + 1] = L - X[i];
}
long[][][][] dp = new long[N + 1][N + 1][N + 1][2]; //dp[i][j][k][l] = min time to i stamps, j left, k right, l = 0 last left, 1 last right
for(int i = 0; i <= N; ++i) {
for(int j = 0; j <= N; ++j) {
for(int k = 0; k <= N; ++k) {
dp[i][j][k][0] = Long.MAX_VALUE / 2;
dp[i][j][k][1] = Long.MAX_VALUE / 2;
}
}
}
dp[0][0][0][0] = 0;
dp[0][0][0][1] = 0;
int ans = 0;
for(int i = 0; i <= N; ++i) {
for(int j = 0; j <= N; ++j) {
for(int k = 0; k <= N; ++k) {
if(j + k > N || j + k < i) continue;
if(j > 0) {
//transition from dp[i - 1][j - 1][k][0], dp[i - 1][j - 1][k][1], dp[i][j - 1][k][0], dp[i][j - 1][k][1]
dp[i][j][k][0] = dp[i][j - 1][k][0] + X2[j] - X2[j - 1];
if(i > 0 && dp[i - 1][j - 1][k][0] + X2[j] - X2[j - 1] <= T[N - j])
dp[i][j][k][0] = Math.min(dp[i][j][k][0], dp[i - 1][j - 1][k][0] + X2[j] - X2[j - 1]);
dp[i][j][k][0] = Math.min(dp[i][j][k][0], dp[i][j - 1][k][1] + X2[j] + X[k]);
if(i > 0 && dp[i - 1][j - 1][k][1] + X2[j] + X[k] <= T[N - j])
dp[i][j][k][0] = Math.min(dp[i][j][k][0], dp[i - 1][j - 1][k][1] + X2[j] + X[k]);
}
if(k > 0) {
dp[i][j][k][1] = dp[i][j][k - 1][0] + X2[j] + X[k];
if(i > 0 && dp[i - 1][j][k - 1][0] + X2[j] + X[k] <= T[k - 1])
dp[i][j][k][1] = Math.min(dp[i][j][k][1], dp[i - 1][j][k - 1][0] + X2[j] + X[k]);
dp[i][j][k][1] = Math.min(dp[i][j][k][1], dp[i][j][k - 1][1] + X[k] - X[k - 1]);
if(i > 0 && dp[i - 1][j][k - 1][1] + X[k] - X[k - 1] <= T[k - 1])
dp[i][j][k][1] = Math.min(dp[i][j][k][1], dp[i - 1][j][k - 1][1] + X[k] - X[k - 1]);
}
if(dp[i][j][k][0] < Long.MAX_VALUE / 2 || dp[i][j][k][1] < Long.MAX_VALUE / 2) ans = i;
}
}
}
System.out.println(ans);
in.close();
}
}
Compilation message
ho_t3.java:4: error: class ho_t1 is public, should be declared in a file named ho_t1.java
public class ho_t1 {
^
1 error
