first commit

J04014 - TÍNH TOÁN PHÂN SỐ.java

@@ -0,0 +1,63 @@
+import java.util.*;;
+
+public class Main {
+    static long gcd(long a, long b) {
+        if (b == 0)
+            return a;
+        return gcd(b, a % b);
+    }
+    
+    static class ps {
+        long t, m;
+
+        public ps(long x, long y) {
+            t = x;
+            m = y;
+            this.rg();
+        }
+
+        public void rg() {
+            long x = gcd(t, m);
+            t /= x;
+            m /= x;
+            // if (m < 0) {
+            //     t *= -1;
+            //     m *= -1;
+            // }
+        }
+
+        public ps add(ps b) {
+            ps r = new ps(0, 1);
+            r.m = m * b.m;
+            r.t = t * b.m + m * b.t;
+            r.rg();
+            return r;
+        }
+
+        public ps mul(ps b) {
+            ps r = new ps(0, 1);
+            r.t = t * b.t;
+            r.m = m * b.m;
+            r.rg();
+            return r;
+        }
+
+        @Override
+        public String toString() {
+            return String.format("%d/%d", t, m);
+        }
+    }
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        int t = sc.nextInt();
+        while (t-- > 0) {
+            ps a = new ps(sc.nextLong(), sc.nextLong());
+            ps b = new ps(sc.nextLong(), sc.nextLong());
+            ps sum = a.add(b);
+            ps c = sum.mul(sum);
+            ps d = a.mul(b.mul(c));
+            System.out.printf("%s %s\n", c, d);
+            
+        }
+    }
+}