Largest Number LeetCode solution in C++

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class Solution {
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 public:
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  string largestNumber(vector<int> &nums) {
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    sort(nums.begin(), nums.end(), [&](int a, int b) {
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      string order1 = to_string(a) + to_string(b);
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      string order2 = to_string(b) + to_string(a);
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      return order1 > order2;
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    });
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    string ans = "";
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    for (int i = 0; i < nums.size(); i++) {
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      if (nums[0] == 0) return "0";
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      ans += to_string(nums[i]);
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    }
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    return ans;
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  }
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};