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quicksort， cpp version #558

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quicksort， cpp version #558

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80 changes: 80 additions & 0 deletions basic/sorting/QuickSort/Main.cpp
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Original file line number Diff line number Diff line change
@@ -0,0 +1,80 @@
#include <iostream>
#include <vector>

using namespace std;
void printvec( const vector<int> &vec, const string &strbegin = "", const string &strend = "" )
{
cout << strbegin << endl;
for ( auto val : vec )
{
cout << val << "\t";
}

cout << endl;
cout << strend << endl;
}


int partition( vector<int> & vec, int left, int right )
{
if ( left >= right )
{
return left;
}

int base = vec[left];
while ( left < right )
{
while ( left < right && vec[right] >= base )
{
right--;
}
if ( left >= right )
{
break;
}

vec[left] = vec[right];

while ( left < right && vec[left] <= base )
{
left++;
}

if ( left >= right )
{
break;
}

vec[right] = vec[left];
}

vec[left] = base;
return left;
}


void quicksort( vector<int> & vec, int left, int right )
{
if ( left >= right )
{
return;
}

int idx = partition( vec, left, right );
quicksort( vec, left, idx - 1 );
quicksort( vec, idx + 1, right );
}


int main( void )
{
vector<int> vec = { 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
printvec( vec );
quicksort( vec, 0, vec.size() - 1 );
printvec( vec, "after insert sort" );
return 0;
}



83 changes: 83 additions & 0 deletions basic/sorting/QuickSort/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -288,4 +288,87 @@ fn main() -> io::Result<()> {
}
```



**C++**

```c++
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Suggested change
```c++
```cpp

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修改后重新pr，这个老的是关闭，貌似我没权限操作老的?

#include <iostream>
#include <vector>

using namespace std;
void printvec( const vector<int> &vec, const string &strbegin = "", const string &strend = "" )
{
cout << strbegin << endl;
for ( auto val : vec )
{
cout << val << "\t";
}

cout << endl;
cout << strend << endl;
}


int partition( vector<int> & vec, int left, int right )
{
if ( left >= right )
{
return left;
}

int base = vec[left];
while ( left < right )
{
while ( left < right && vec[right] >= base )
{
right--;
}
if ( left >= right )
{
break;
}

vec[left] = vec[right];

while ( left < right && vec[left] <= base )
{
left++;
}

if ( left >= right )
{
break;
}

vec[right] = vec[left];
}

vec[left] = base;
return left;
}


void quicksort( vector<int> & vec, int left, int right )
{
if ( left >= right )
{
return;
}

int idx = partition( vec, left, right );
quicksort( vec, left, idx - 1 );
quicksort( vec, idx + 1, right );
}


int main( void )
{
vector<int> vec = { 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 };
printvec( vec );
quicksort( vec, 0, vec.size() - 1 );
printvec( vec, "after insert sort" );
return 0;
}
```
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