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-rw-r--r--other/longest_consecutive_sequence.cpp36
1 files changed, 36 insertions, 0 deletions
diff --git a/other/longest_consecutive_sequence.cpp b/other/longest_consecutive_sequence.cpp
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+++ b/other/longest_consecutive_sequence.cpp
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+#include "leetcode.h"
+
+class Solution {
+public:
+ int longestConsecutive(vector<int> &nums) {
+ unordered_set<int> us;
+ int ans = 0;
+ for (int i = 0; i < nums.size(); i++)
+ us.insert(nums[i]);
+ while (us.size() > 0) {
+ int num = *us.begin();
+ int count = 1;
+ us.erase(num);
+ int smaller = num - 1;
+ int bigger = num + 1;
+ while (us.count(smaller) > 0) {
+ us.erase(smaller);
+ smaller--;
+ count++;
+ }
+ while (us.count(bigger) > 0) {
+ us.erase(bigger);
+ bigger++;
+ count++;
+ }
+ ans = max(ans, count);
+ }
+ return ans;
+ }
+};
+
+int main() {
+ Solution obj;
+ vector<int> nums = {100, 4, 200, 1, 3, 2};
+ cout << obj.longestConsecutive(nums);
+}