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fast io java
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import java.io.IOException; | |
import java.io.InputStream; | |
import java.util.InputMismatchException; | |
class InputReader { | |
private InputStream stream; | |
private byte[] buf = new byte[102400]; | |
private int curChar; | |
private int numChars; | |
public InputReader(InputStream stream) { | |
this.stream = stream; | |
} | |
public final int read() { | |
if (numChars == -1) | |
throw new InputMismatchException(); | |
if (curChar >= numChars) { | |
curChar = 0; | |
try { | |
numChars = stream.read(buf); | |
} catch (IOException e) { | |
throw new InputMismatchException(); | |
} | |
if (numChars <= 0) | |
return -1; | |
} | |
return buf[curChar++]; | |
} | |
public final int readInt() { | |
int c = read(); | |
while (isSpaceChar(c)) | |
c = read(); | |
int sgn = 1; | |
if (c == '-') { | |
sgn = -1; | |
c = read(); | |
} | |
int res = 0; | |
do { | |
if (c < '0' || c > '9') | |
throw new InputMismatchException(); | |
res *= 10; | |
res += c - '0'; | |
c = read(); | |
} while (!isSpaceChar(c)); | |
return res * sgn; | |
} | |
public final long readLong() { | |
int c = read(); | |
while (isSpaceChar(c)) | |
c = read(); | |
int sgn = 1; | |
if (c == '-') { | |
sgn = -1; | |
c = read(); | |
} | |
long res = 0; | |
do { | |
if (c < '0' || c > '9') | |
throw new InputMismatchException(); | |
res *= 10; | |
res += c - '0'; | |
c = read(); | |
} while (!isSpaceChar(c)); | |
return res * sgn; | |
} | |
public final String readString() { | |
int c = read(); | |
while (isSpaceChar(c)) | |
c = read(); | |
StringBuilder res = new StringBuilder(); | |
do { | |
res.appendCodePoint(c); | |
c = read(); | |
} while (!isSpaceChar(c)); | |
return res.toString(); | |
} | |
public static boolean isSpaceChar(int c) { | |
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; | |
} | |
public final String next() { | |
return readString(); | |
} | |
} |
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