[HAI] twoSumHashtable etalon by Max

lib/twoSumHashTable/twoSumHashTable.ts

@@ -1,24 +1,38 @@
-export function twoSumHashTable(nums: number[], target: number): number[] {
-  const result: number[] = [];
-  const hashTable: Record<string, number> = {};
-  let i = 0;
+// export function twoSumHashTable(nums: number[], target: number): number[] {
+//   const result: number[] = [];
+//   const hashTable: Record<string, number> = {};
+//   let i = 0;
 
 
-  while (i < nums.length) {
-    let key = nums[i];
-    let val = i;
-    let searchKey = String(target - key);
+//   while (i < nums.length) {
+//     let key = nums[i];
+//     let val = i;
+//     let searchKey = String(target - key);
 
-    if (searchKey in hashTable) {
-      result.push(hashTable[searchKey]);
-      result.push(val);
-      break;
-    } else {
-      hashTable[key] = val;
-    }
+//     if (searchKey in hashTable) {
+//       result.push(hashTable[searchKey]);
+//       result.push(val);
+//       break;
+//     } else {
+//       hashTable[key] = val;
+//     }
 
-    i++
-  }
+//     i++
+//   }
+
+//   return result;
+// };
 
-  return result;
+export function twoSumHashTable(nums: number[], target: number): number[] {
+  let usedNums = {};
+
+  for (let idx = 0; idx < nums.length; idx++) {
+    let secondNum = nums[idx];
+    let firstNum = target - secondNum;
+    if (firstNum in usedNums) {
+      return [usedNums[firstNum], idx];
+    }
+    usedNums[secondNum] = idx;
+  }
+  return [];
 };