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p298.java
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p298.java
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import java.io.*;
/**
* @author Rubén Saiz
*/
class Arbol {
int val;
Arbol left, right;
Arbol(int x) { val = x; }
public String toString() {
return String.valueOf( val );
}
}
public class p298 {
final static FastReader r = new FastReader(System.in);
static void insertNodes(Arbol node) {
int value = r.readInt();
if (value != -1) {
node.left = new Arbol( value );
insertNodes(node.left);
}
value = r.readInt();
if (value != -1) {
node.right = new Arbol( value );
insertNodes( node.right);
}
}
static boolean isBST(Arbol node, Integer min, Integer max) {
if (node == null) return true;
if (min != null && node.val <= min ||
max != null && node.val >= max)
return false;
return isBST(node.left, min, node.val) &&
isBST(node.right, node.val, max);
}
public static void main(String[] args) {
int rootValue;
for (int i = r.readInt(); i > 0; i--) {
rootValue = r.readInt();
if (rootValue == -1) System.out.println("SI");
else {
Arbol root = new Arbol( rootValue );
insertNodes( root );
System.out.println( isBST(root, null, null) ? "SI" : "NO" );
}
}
}
}
class FastReader {
private InputStream stream;
private byte[] buf = new byte[1024];
private int curChar;
private int numChars;
public FastReader(InputStream stream) {
this.stream = stream;
}
public int read() {
if (numChars == -1)
throw new RuntimeException();
if (curChar >= numChars) {
curChar = 0;
try {
numChars = stream.read(buf);
} catch (IOException e) {
throw new RuntimeException();
}
if (numChars <= 0)
return -1;
}
return buf[curChar++];
}
public String readString() {
final StringBuilder stringBuilder = new StringBuilder();
int c = read();
while (isSpaceChar(c))
c = read();
do {
stringBuilder.append(c);
c = read();
} while (!isSpaceChar((char) c));
return stringBuilder.toString();
}
public int readInt() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
int res = 0;
do {
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public long readLong() {
int c = read();
while (isSpaceChar(c))
c = read();
int sgn = 1;
if (c == '-') {
sgn = -1;
c = read();
}
long res = 0;
do {
res *= 10;
res += c - '0';
c = read();
} while (!isSpaceChar(c));
return res * sgn;
}
public boolean isSpaceChar(int c) {
return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
}
}