桶排序

# （基数排序是桶排序的特例，优势是可以处理浮点数和负数，劣势是还要配合别的排序函数）

vector<int> bucketSort(vector<int>& nums) {
    int n = nums.size();
    int maxv = *max_element(nums.begin(), nums.end());
    int minv = *min_element(nums.begin(), nums.end());
    int bs = 1000;
    int m = (maxv-minv)/bs+1;
    vector<vector<int> > bucket(m);
    for (int i = 0; i < n; ++i) {
        bucket[(nums[i]-minv)/bs].push_back(nums[i]);
    }
    int idx = 0;
    for (int i = 0; i < m; ++i) {
        int sz = bucket[i].size();
        bucket[i] = quickSort(bucket[i]);
        for (int j = 0; j < sz; ++j) {
            nums[idx++] = bucket[i][j];
        }
    }
    return nums;
}