版权声明:博客文章都是作者辛苦整理的,转载请注明出处,谢谢! https://cloud.tencent.com/developer/article/1435031
文章作者:Tyan
博客:noahsnail.com | CSDN | 简书
bool compare(const pair<int, int> &a, const pair<int, int> &b) {
return a.second > b.second;
}
class Solution {
public:
vector<int> topKFrequent(vector<int>& nums, int k) {
map<int, int> elements;
for(int i = 0; i < nums.size(); i++) {
elements[nums[i]]++;
}
vector<pair<int, int>> temp;
map<int, int>::iterator iter;
for(iter = elements.begin(); iter != elements.end(); iter++) {
temp.push_back(pair<int, int>(iter->first, iter->second));
}
sort(temp.begin(), temp.end(), compare);
vector<int> result;
for(int i = 0; i < k; i++) {
result.push_back(temp[i].first);
}
return result;
}
};
class Solution {
public:
vector<int> topKFrequent(vector<int>& nums, int k) {
map<int, int> elements;
for(int i = 0; i < nums.size(); i++) {
elements[nums[i]]++;
}
vector<vector<int>> bucket(nums.size() + 1);
map<int, int>::iterator iter;
for(iter = elements.begin(); iter != elements.end(); iter++) {
bucket[iter->second].push_back(iter->first);
}
reverse(bucket.begin(), bucket.end());
vector<int> result;
for(int i = 0; i < bucket.size(); i++) {
for(int j = 0; j < bucket[i].size(); j++) {
result.push_back(bucket[i][j]);
if(result.size() == k) {
return result;
}
}
}
return result;
}
};