2610. 转换二维数组

2610. 转换二维数组

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题目链接：2610. 转换二维数组

代码如下：

class Solution {
public:
	vector<vector<int>> findMatrix(vector<int>& nums) {
		unordered_map<int, int> um;
		for (int i = 0;i < nums.size();i++) {
			um[nums[i]]++;
		}
		vector<vector<int>> res;
		while (!um.empty()) {
			vector<int> arr;
			for (unordered_map<int, int>::iterator it = um.begin();it != um.end();) {
				it->second--;
				arr.push_back(it->first);	
				if (it->second == 0) {
					it = um.erase(it);
				}
				else {
					it++;
				}
			}
			res.push_back(arr);
		}
		return res;
	}
};