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input.java
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171 lines (154 loc) · 4.28 KB
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class Input
{
final int SIZE = 8192; //4096; 8192; 65536;
InputStream in;
byte[] buf = new byte[SIZE];
int last, current, total;
public Input(InputStream stream) throws IOException
{
in = stream; last = read();
}
int read() throws IOException
{
if (total == -1) return -1;
if (current >= total)
{
current = 0; total = in.read(buf);
if (total <= 0) return -1;
}
return buf[current++];
}
void advance() throws IOException
{
while (true)
{
if (last == -1) return;
if (!isValidChar(last)) last = read();
else break;
}
}
boolean isValidChar(int c) { return c > 32 && c < 127; }
public boolean endOfFile() throws IOException { advance(); return last == -1; }
public String nextString() throws IOException
{
advance();
if (last == -1) throw new EOFException();
StringBuilder s = new StringBuilder();
while (true)
{
s.appendCodePoint(last); last = read();
if (!isValidChar(last)) break;
}
return s.toString();
}
public String nextLine() throws IOException
{
if (last == -1) throw new EOFException();
StringBuilder s = new StringBuilder();
while (true)
{
s.appendCodePoint(last); last = read();
if (last == '\n' || last == -1) break;
}
return s.toString();
}
public String nextLine(boolean ignoreIfEmpty) throws IOException
{
if (!ignoreIfEmpty) return nextLine();
String s = nextLine();
while (s.trim().length() == 0) s = nextLine();
return s;
}
public int nextInt() throws IOException
{
advance();
if (last == -1) throw new EOFException();
int n = 0, s = 1;
if (last == '-')
{
s = -1; last = read();
if (last == -1) throw new EOFException();
}
while (true)
{
n = n * 10 + last - '0'; last = read();
if (!isValidChar(last)) break;
}
return n * s;
}
public long nextLong() throws IOException
{
advance();
if (last == -1) throw new EOFException();
int s = 1;
if (last == '-')
{
s = -1; last = read();
if (last == -1) throw new EOFException();
}
long n = 0;
while (true)
{
n = n * 10 + last - '0'; last = read();
if (!isValidChar(last)) break;
}
return n * s;
}
public BigInteger nextBigInt() throws IOException { return new BigInteger(nextString()); }
public char nextChar() throws IOException
{
advance();
char c = (char) last;
last = 0;
return c;
}
public double nextDouble() throws IOException
{
advance();
if (last == -1) throw new EOFException();
int s = 1;
if (last == '-')
{
s = -1; last = read();
if (last == -1) throw new EOFException();
}
double n = 0;
while (true)
{
n = n * 10 + last - '0'; last = read();
if (!isValidChar(last) || last == '.') break;
}
if (last == '.')
{
last = read();
if (last == -1) throw new EOFException();
double m = 1;
while (true)
{
m = m / 10;
n = n + (last - '0') * m; last = read();
if (!isValidChar(last)) break;
}
}
return n * s;
}
public BigDecimal nextBigDecimal() throws IOException { return new BigDecimal(nextString()); }
public int[] nextIntArray(int len) throws IOException
{
int[] A = new int[len];
for (int i = 0; i < len; i++) A[i] = nextInt();
return A;
}
public long[] nextLongArray(int len) throws IOException
{
long[] A = new long[len];
for (int i = 0; i < len; i++) A[i] = nextLong();
return A;
}
public int[][] nextIntTable(int rows, int cols) throws IOException
{
int[][] T = new int[rows][];
for (int i = 0; i < rows; i++) T[i] = nextIntArray(cols);
return T;
}
}