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// ��������Please upvote if it helps ��������
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class Solution {
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 public:
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  vector<string> summaryRanges(vector<int> &nums) {
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    // resultant string
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    vector<string> result;
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    int n = nums.size();
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    // if size happens to be  zero return empty string
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    if (n == 0) return result;
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    // assigning first element to a
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    int a = nums[0];
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    for (int i = 0; i < n; i++) {
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      // if one of both is true
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      if (i == n - 1 || nums[i] + 1 != nums[i + 1]) {
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        // if current element is not equals a
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        // this means we have found a range.
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        if (nums[i] != a) result.push_back(to_string(a) + "->" + to_string(nums[i]));
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        // this means we have reached to the end of string and now
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        // we have to add a that should be the last element
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        else
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          result.push_back(to_string(a));
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        // checking  for this condition so that a got updated for next range
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        // also n-1 so that a doesn't contain out of bound value
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        if (i != n - 1) a = nums[i + 1];
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      }
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    }
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    // return result
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    return result;
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  }
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};