39 lines
948 B
C++
39 lines
948 B
C++
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/**
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* File: top_k.cpp
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* Created Time: 2023-06-12
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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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/* <20><><EFBFBD>ڶѲ<DAB6><D1B2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> k <20><>Ԫ<EFBFBD><D4AA> */
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priority_queue<int, vector<int>, greater<int>> topKHeap(vector<int> &nums, int k) {
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// <20><>ʼ<EFBFBD><CABC>С<EFBFBD><D0A1><EFBFBD><EFBFBD>
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priority_queue<int, vector<int>, greater<int>> heap;
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// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ k <20><>Ԫ<EFBFBD><D4AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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for (int i = 0; i < k; i++) {
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heap.push(nums[i]);
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}
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// <20>ӵ<EFBFBD> k+1 <20><>Ԫ<EFBFBD>ؿ<EFBFBD>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD><EFBFBD>ֶѵij<D1B5><C4B3><EFBFBD>Ϊ k
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for (int i = k; i < nums.size(); i++) {
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// <20><><EFBFBD><EFBFBD>ǰԪ<C7B0>ش<EFBFBD><D8B4>ڶѶ<DAB6>Ԫ<EFBFBD>أ<EFBFBD><D8A3>Ѷ<F2BDABB6>Ԫ<EFBFBD>س<EFBFBD><D8B3>ѡ<EFBFBD><D1A1><EFBFBD>ǰԪ<C7B0><D4AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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if (nums[i] > heap.top()) {
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heap.pop();
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heap.push(nums[i]);
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}
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}
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return heap;
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}
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// Driver Code
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int main() {
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vector<int> nums = {1, 7, 6, 3, 2};
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int k = 3;
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priority_queue<int, vector<int>, greater<int>> res = topKHeap(nums, k);
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cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> " << k << " <20><>Ԫ<EFBFBD><D4AA>Ϊ: ";
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printHeap(res);
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return 0;
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}
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