refactor: solution 679. 24 Game

Author: tzuyi0817

solutions/679. 24 Game/README.md

@@ -68,30 +68,34 @@
  * @return {boolean}
  */
 const judgePoint24 = function (cards) {
-  if (cards.length === 1) return Math.abs(cards[0] - 24) < 1e-6;
-
   const n = cards.length;
 
+  if (n === 1) return Math.abs(cards[0] - 24) < 10e-9;
+
   const getValues = (a, b) => {
     const values = [a + b, a * b, a - b, b - a];
 
     if (a) values.push(b / a);
     if (b) values.push(a / b);
+
     return values;
   };
 
-  for (let a = 1; a < n; a++) {
-    for (let b = 0; b < a; b++) {
+  for (let a = 0; a < n - 1; a++) {
+    for (let b = a + 1; b < n; b++) {
       const values = getValues(cards[a], cards[b]);
       const nextCards = cards.filter((_, index) => index !== a && index !== b);
 
       for (const value of values) {
         nextCards.push(value);
+
         if (judgePoint24(nextCards)) return true;
+
         nextCards.pop();
       }
     }
   }
+
   return false;
 };
 ```

solutions/679. 24 Game/solution.js

@@ -3,29 +3,33 @@
  * @return {boolean}
  */
 const judgePoint24 = function (cards) {
-  if (cards.length === 1) return Math.abs(cards[0] - 24) < 1e-6;
-
   const n = cards.length;
 
+  if (n === 1) return Math.abs(cards[0] - 24) < 10e-9;
+
   const getValues = (a, b) => {
     const values = [a + b, a * b, a - b, b - a];
 
     if (a) values.push(b / a);
     if (b) values.push(a / b);
+
     return values;
   };
 
-  for (let a = 1; a < n; a++) {
-    for (let b = 0; b < a; b++) {
+  for (let a = 0; a < n - 1; a++) {
+    for (let b = a + 1; b < n; b++) {
       const values = getValues(cards[a], cards[b]);
       const nextCards = cards.filter((_, index) => index !== a && index !== b);
 
       for (const value of values) {
         nextCards.push(value);
+
         if (judgePoint24(nextCards)) return true;
+
         nextCards.pop();
       }
     }
   }
+
   return false;
 };