quick fix to address warnings

Author: charliesbot

cpp/0001_two_sum/0001_two_sum.h

@@ -7,13 +7,12 @@ using std::vector;
 class Solution {
 public:
   vector<int> twoSum(vector<int> &nums, int target) {
-
     unordered_map<int, int> umap;
-    for (int i = 0; i < nums.size(); i++) {
+    for (uint i = 0; i < nums.size(); i++) {
       const int current = nums[i];
 
       if (umap.count(current) > 0) {
-        return {i, umap[current]};
+        return {(int)i, umap[current]};
       }
 
       const int diff = target - nums[i];

cpp/0001_two_sum/0001_two_sum_test.cc

@@ -9,7 +9,7 @@ TEST(TwoSumTest, Example1) {
   const vector<int> mock = Solution().twoSum(nums, 9);
 
   const vector<int> solution = {1, 0};
-  for (int i = 0; i < mock.size(); ++i) {
+  for (uint i = 0; i < mock.size(); ++i) {
     EXPECT_EQ(solution[i], mock[i]);
   }
 }