Given scores of N athletes, find their relative ranks and the people with the top three highest scores, who will be awarded medals: "Gold Medal", "Silver Medal" and "Bronze Medal".

Example 1:

Input: [5, 4, 3, 2, 1]
Output: ["Gold Medal", "Silver Medal", "Bronze Medal", "4", "5"]
Explanation: The first three athletes got the top three highest scores, so they got "Gold Medal", "Silver Medal" and "Bronze Medal". 
For the left two athletes, you just need to output their relative ranks according to their scores.

Note:

1. N is a positive integer and won't exceed 10,000.
2. All the scores of athletes are guaranteed to be unique.

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給每一個數一個排名，前三名是金銀銅。這是排序的問題。將原序列的每個數的鍵值和值組成pair，然後按值從大到小排序。最後按順序給排名就行了。

程式碼：

class Solution
{
public:
	vector<string> findRelativeRanks(vector<int>& nums)
	{
		vector<pair<int, int> > vec;
		vector<string> res(nums.size());
		string ranks[3] = {"Gold Medal", "Silver Medal", "Bronze Medal"};

		for(int i = 0; i < nums.size(); ++i) 
			vec.push_back(pair<int, int>(i, nums[i]));
		auto cmp = [](const pair<int, int>& p1, const pair<int, int>& p2) { return p1.second > p2.second; };
		sort(vec.begin(), vec.end(), cmp);

		for(int i = 0; i < nums.size(); ++i)
		{
			if(i < 3) res[vec[i].first] = ranks[i];
			else res[vec[i].first] = to_string(i+1);
		}
		return res;
	}
};