first commit

J04008 - CHU VI TAM GIÁC.java

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+import java.util.*;
+public class Main{
+    static class pair{
+        public pair(double a, double b){
+            this.x = a;
+            this.y = b;
+        }
+        double x,y;
+    }
+    static double dis(pair a, pair b){
+        return Math.sqrt(Math.pow(a.x - b.x, 2) + Math.pow(a.y - b.y, 2));
+    }
+    static boolean validate(double[] c){
+        double max = Math.max(c[0], Math.max(c[1], c[2]));
+        if(max*2 >= c[0]+c[1]+c[2]) return false;
+        return true;
+    }
+    public static void main(String[] a) {
+        Scanner sc=new Scanner(System.in);
+        int t = sc.nextInt();
+        while(t-->0){
+            pair[] p = new pair[3];
+            for(int i=0; i<3; i++) p[i] = new pair(sc.nextDouble(), sc.nextDouble());
+            double[] c = new double[3];
+            for(int i=0; i<3; i++){
+                c[i] = dis(p[i], p[(i+1)%3]);
+            }
+            if(validate(c)) System.out.printf("%.3f\n",c[0]+c[1]+c[2]);
+            else System.out.println("INVALID");
+        }
+    }
+}