45 lines
1.1 KiB
C++
45 lines
1.1 KiB
C++
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/**
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* File: bucket_sort.cpp
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* Created Time: 2023-03-30
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* Author: krahets (krahets@163.com)
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*/
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#include "../utils/common.hpp"
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/* Ͱ<><CDB0><EFBFBD><EFBFBD> */
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void bucketSort(vector<float> &nums) {
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// <20><>ʼ<EFBFBD><CABC> k = n/2 <20><>Ͱ<EFBFBD><CDB0>Ԥ<EFBFBD><D4A4><EFBFBD><EFBFBD>ÿ<EFBFBD><C3BF>Ͱ<EFBFBD><CDB0><EFBFBD><EFBFBD> 2 <20><>Ԫ<EFBFBD><D4AA>
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int k = nums.size() / 2;
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vector<vector<float>> buckets(k);
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// 1. <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ԫ<EFBFBD>ط<EFBFBD><D8B7>䵽<EFBFBD><E4B5BD><EFBFBD><EFBFBD>Ͱ<EFBFBD><CDB0>
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for (float num : nums) {
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ݷ<EFBFBD>ΧΪ [0, 1)<29><>ʹ<EFBFBD><CAB9> num * k ӳ<>䵽<EFBFBD><E4B5BD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Χ [0, k-1]
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int i = num * k;
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// <20><> num <20><><EFBFBD>ӽ<EFBFBD>Ͱ bucket_idx
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buckets[i].push_back(num);
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}
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// 2. <20>Ը<EFBFBD><D4B8><EFBFBD>Ͱִ<CDB0><D6B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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for (vector<float> &bucket : buckets) {
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// ʹ<><CAB9><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><D2B2><EFBFBD><EFBFBD><EFBFBD>滻<EFBFBD><E6BBBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>㷨
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sort(bucket.begin(), bucket.end());
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}
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// 3. <20><><EFBFBD><EFBFBD>Ͱ<EFBFBD>ϲ<EFBFBD><CFB2><EFBFBD><EFBFBD><EFBFBD>
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int i = 0;
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for (vector<float> &bucket : buckets) {
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for (float num : bucket) {
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nums[i++] = num;
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}
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}
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}
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/* Driver Code */
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int main() {
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><CEAA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ΧΪ [0, 1)
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vector<float> nums = {0.49f, 0.96f, 0.82f, 0.09f, 0.57f, 0.43f, 0.91f, 0.75f, 0.15f, 0.37f};
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bucketSort(nums);
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cout << "Ͱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ɺ<EFBFBD> nums = ";
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printVector(nums);
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return 0;
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}
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