二分，快排，归并

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aosei 2023-08-16 10:57:58 +08:00
parent 3b79a9531b
commit b89eb9a2b4
10 changed files with 278 additions and 0 deletions
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w-bug_algori_8.16/w-bug_algori_8.16/test.cpp Normal file
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#include <iostream>
#include <vector>
using namespace std;
//二分
//寻找区间左端点
while (left < right)
{
int mid = left + (right - left) / 2;
if (...)
left = mid + 1;
else
right = mid;
}
//寻找区间右端点
while (left < right)
{
int mid = left + (right - left + 1) / 2;
if (...)
left = mid;
else
right = mid - 1;
}
//快排（三路划分+随机选取key）
//随机选取key
int Getrand(vector<int>& nums, int left, int right)
{
return nums[rand() % (right - left + 1) + left];
}
//三路划分
void qsort(vector<int>& nums, int l, int r)
{
if (l >= r)
return;
int key = Getrand(nums, l, r);
int left = l - 1, right = r + 1, i = l;
while (i < right)
{
if (nums[i] < key)
swap(nums[++left], nums[i++]);
else if (nums[i] == key)
i++;
else
swap(nums[--right], nums[i]);
}
qsort(nums, l, left);
qsort(nums, right, r);
}
//归并
int tmp[50000]; //临时数组
void mergesort(vector<int>& nums, int left, int right)
{
if (left >= right)
return;
int mid = left + (right - left) / 2;
//分割数组
mergesort(nums, left, mid);
mergesort(nums, mid + 1, right);
//开始合并数组
int cur1 = left, cur2 = mid + 1, i = 0;
while (cur1 <= mid && cur2 <= right)
{
if (nums[cur1] < nums[cur2])
tmp[i++] = nums[cur1++];
else
tmp[i++] = nums[cur2++];
}
while (cur1 <= mid)
tmp[i++] = nums[cur1++];
while (cur2 <= right)
tmp[i++] = nums[cur2++];
for (int i = left; i <= right; i++)
nums[i] = tmp[i - left];
}

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