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-rw-r--r--single_number.cpp38
1 files changed, 0 insertions, 38 deletions
diff --git a/single_number.cpp b/single_number.cpp
deleted file mode 100644
index e9a5878..0000000
--- a/single_number.cpp
+++ /dev/null
@@ -1,38 +0,0 @@
-#include "leetcode.h"
-
-class Solution {
-public:
- int singleNumber(vector<int> &nums) {
- int ans;
- /*
- * unordered_map to track frequency
- * unordered_map<key data type, value data type>
- * both are int in this case.
- */
- unordered_map<int, int> freq;
- for (int i = 0; i < nums.size(); i++)
- /*
- * store frequency
- * given 4, 1, 2, 1, 2
- * 4 -> once
- * 1 -> twice
- * 2 -> twice
- * output: 4
- */
- freq[nums[i]]++;
- for (auto i : freq) // traverse map
- if (i.second == 1) { // if frequency of any element is 1...
- ans = i.first; // that's the answer
- break; // exit loop because we have our answer
- }
- return ans;
- }
-};
-
-int main() {
- vector<int> nums = {4, 1, 2, 1, 2};
- Solution obj;
- for (int i = 0; i < nums.size(); i++)
- cout << nums[i] << ' ';
- cout << endl << obj.singleNumber(nums);
-}