Problem:
Cross Point

For given two segments s1 and s2, print the coordinate of the cross point of them.

s1 is formed by end points p0 and p1, and
s2 is formed by end points p2 and p3.

Input

The entire input looks like:

q (the number of queries)
1st query
2nd query
...
qth query

Each query consists of integer coordinates of end points of s1 and s2 in the following format:

xp0 yp0 xp1 yp1 xp2 yp2 xp3 yp3

Output

For each query, print the coordinate of the cross point. The output values should be in a decimal fraction with an error less than 0.00000001.

Constraints

1 ≤ q ≤ 1000

-10000 ≤ xpi, ypi ≤ 10000

p0 ≠ p1 and
p2 ≠ p3.

The given segments have a cross point and are not in parallel.

Sample Input

3
0 0 2 0 1 1 1 -1
0 0 1 1 0 1 1 0
0 0 1 1 1 0 0 1

Sample Output

1.0000000000 0.0000000000
0.5000000000 0.5000000000
0.5000000000 0.5000000000

Solution in JAVA (judge verdict: Wrong Answer)

import java.io.IOException;
import java.io.InputStream;
import java.text.DecimalFormat;
import java.util.NoSuchElementException;

public class Main {
	static FastScanner sc = new FastScanner();

	public static void main(String[] args) {
		int q = sc.nextInt();
		
		StringBuilder ans = new StringBuilder();
		for(int i=0; i<q; i++) {
			double x0 = sc.nextDouble();
			double y0 = sc.nextDouble();
			double x1 = sc.nextDouble();
			double y1 = sc.nextDouble();
			double x2 = sc.nextDouble();
			double y2 = sc.nextDouble();
			double x3 = sc.nextDouble();
			double y3 = sc.nextDouble();
			
			double a1 = (y1 - y0) / (x1 - x0);
			double a2 = (y3 - y2) / (x3 - x2);
			double b1 = y0 - a1 * x0;
			double b2 = y2 - a2 * x2;
			
			double x;
			double y;
			if(x1 == x0) {
				x = x0;
				y = a2 * x + b2;
			} else if(x3 == x2) {
				x = x2;
				y = a1 * x + b1;
			} else {
				x = (b1 - b2)/(a2 - a1);
				y = a1 * x + b1;
			}
			DecimalFormat df = new DecimalFormat("0.00000000");
			ans.append(df.format(x));
			ans.append(" ");
			ans.append(df.format(x));
			ans.append("\n");
		}
		System.out.print(ans);
	}

	static class FastScanner {
        private final InputStream in = System.in;
        private final byte[] buffer = new byte[1024];
        private int ptr = 0;
        private int buflen = 0;
        private boolean hasNextByte() {
            if(ptr < buflen) {
                return true;
            } else {
                ptr = 0;
                try {
                    buflen = in.read(buffer);
                } catch(IOException e) {
                    e.printStackTrace();
                }
                if(buflen <= 0) {
                    return false;
                }
            }
            return true;
        }
        private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
        private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
        private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
        public boolean hasNext() { skipUnprintable(); return hasNextByte();}
        public String next() {
            if (!hasNext()) throw new NoSuchElementException();
            StringBuilder sb = new StringBuilder();
            int b = readByte();
            while(isPrintableChar(b)) {
                sb.appendCodePoint(b);
                b = readByte();
            }
            return sb.toString();
        }
        public long nextLong() {
            return Long.parseLong(next());
        }
        public int nextInt(){
            return Integer.parseInt(next());
        }
        public double nextDouble(){
            return Double.parseDouble(next());
        }
    }
}