import java.io.InputStream; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.Comparator; import java.util.InputMismatchException; import java.util.NoSuchElementException; import java.math.BigInteger; public class Main{ static PrintWriter out; static InputReader ir; static void solve(){ P[] ps=new P[5]; for(int i=0;i<5;i++) ps[i]=new P(ir.nextDouble(),ir.nextDouble()); P[] c=convexHull(ps); out.println(c.length==5?"YES":"NO"); } public static P[] convexHull(P[] ps){ int n=ps.length; Arrays.sort(ps,new Comparator

(){ public int compare(P a,P b){ if(a.getX()!=b.getX()) return Double.compare(a.getX(),b.getX()); return Double.compare(a.getY(),b.getY()); } }); int p=0; P[] qs=new P[2*n]; for(int i=0;i1&&(qs[p-1].sub(qs[p-2])).det(ps[i].sub(qs[p-1]))<=0) p--; qs[p++]=ps[i]; } for(int i=n-2,t=p;i>=0;i--){ while(p>t&&(qs[p-1].sub(qs[p-2])).det(ps[i].sub(qs[p-1]))<=0) p--; qs[p++]=ps[i]; } return Arrays.copyOf(qs,p-1); } static final double EPS=1e-10; public static double accurateTotal(double a,double b){ if(Math.abs(a+b)=lenbuf){ curbuf= 0; try{ lenbuf=in.read(buffer); }catch(IOException e) { throw new InputMismatchException(); } if(lenbuf<=0) return false; } return true; } private int readByte(){if(hasNextByte()) return buffer[curbuf++]; else return -1;} private boolean isSpaceChar(int c){return !(c>=33&&c<=126);} private void skip(){while(hasNextByte()&&isSpaceChar(buffer[curbuf])) curbuf++;} public boolean hasNext(){skip(); return hasNextByte();} public String next(){ if(!hasNext()) throw new NoSuchElementException(); StringBuilder sb=new StringBuilder(); int b=readByte(); while(!isSpaceChar(b)){ sb.appendCodePoint(b); b=readByte(); } return sb.toString(); } public int nextInt() { if(!hasNext()) throw new NoSuchElementException(); int c=readByte(); while (isSpaceChar(c)) c=readByte(); boolean minus=false; if (c=='-') { minus=true; c=readByte(); } int res=0; do{ if(c<'0'||c>'9') throw new InputMismatchException(); res=res*10+c-'0'; c=readByte(); }while(!isSpaceChar(c)); return (minus)?-res:res; } public long nextLong() { if(!hasNext()) throw new NoSuchElementException(); int c=readByte(); while (isSpaceChar(c)) c=readByte(); boolean minus=false; if (c=='-') { minus=true; c=readByte(); } long res = 0; do{ if(c<'0'||c>'9') throw new InputMismatchException(); res=res*10+c-'0'; c=readByte(); }while(!isSpaceChar(c)); return (minus)?-res:res; } public double nextDouble(){return Double.parseDouble(next());} public BigInteger nextBigInteger(){return new BigInteger(next());} public int[] nextIntArray(int n){ int[] a=new int[n]; for(int i=0;i