diff --git a/leetcode/1 - twosum/twoSum.ts b/leetcode/1 - twosum/twoSum.ts
new file mode 100644
index 0000000..f981b8a
--- /dev/null
+++ b/leetcode/1 - twosum/twoSum.ts	
@@ -0,0 +1,54 @@
+function twoSum(nums: number[], target: number): number[] {
+    const pairs: Map<number, number> = new Map();
+    let results: number[] = [];
+    
+    nums.forEach((val, idx) => {
+        const found = pairs.get(target - val);
+        
+        if (found !== undefined)
+            return results = [idx, found];
+        
+        pairs.set(val, idx)
+        
+    });
+    
+    return results;
+};
+
+// Outras possíveis soluções
+//
+// function twoSum(nums: number[], target: number): number[] {
+//     const pairs: Map<number, number> = new Map();
+//     let results: number[] = [];
+    
+//     for (let i = 0; i < nums.length; i++) {
+//         const value = nums[i];
+//         const found = pairs.get(target - value);
+        
+//         if (found !== undefined)
+//             return results = [i, found];
+        
+//         pairs.set(value, i)
+//     }    
+    
+//     return results;
+// };
+//
+// function twoSum(nums: number[], target: number): number[] {
+//     const pairs: Map<number, number> = new Map();
+//     let result: number[] = [];
+    
+//     for (let i = 0; i < nums.length; i++) {
+//         const value = nums[i];
+//         const found = pairs.get(target - value);
+
+//         if (found !== undefined) {
+//             result = [i, found];
+//             break;
+//         }
+        
+//         pairs.set(value, i); 
+//     }
+
+//     return result;
+// }
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