Created
November 1, 2017 07:05
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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[64]; // 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(); | |
} | |
} |
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