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ReorderArray.cpp
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172 lines (138 loc) · 3.61 KB
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/*******************************************************************
Copyright(c) 2016, Harry He
All rights reserved.
Distributed under the BSD license.
(See accompanying file LICENSE.txt at
https://github.com/zhedahht/CodingInterviewChinese2/blob/master/LICENSE.txt)
*******************************************************************/
//==================================================================
// 《剑指Offer——名企面试官精讲典型编程题》代码
// 作者：何海涛
//==================================================================
// 面试题21：调整数组顺序使奇数位于偶数前面
// 题目：输入一个整数数组，实现一个函数来调整该数组中数字的顺序，使得所有
// 奇数位于数组的前半部分，所有偶数位于数组的后半部分。
#include <cstdio>
void Reorder(int *pData, unsigned int length, bool (*func)(int));
bool isEven(int n);
// ====================方法一====================
void ReorderOddEven_1(int *pData, unsigned int length)
{
if(pData == nullptr || length == 0)
return;
int *pBegin = pData;
int *pEnd = pData + length - 1;
while(pBegin < pEnd)
{
// 向后移动pBegin，直到它指向偶数
while(pBegin < pEnd && (*pBegin & 0x1) != 0)
pBegin ++;
// 向前移动pEnd，直到它指向奇数
while(pBegin < pEnd && (*pEnd & 0x1) == 0)
pEnd --;
if(pBegin < pEnd)
{
int temp = *pBegin;
*pBegin = *pEnd;
*pEnd = temp;
}
}
}
// ====================方法二====================
void ReorderOddEven_2(int *pData, unsigned int length)
{
Reorder(pData, length, isEven);
}
void Reorder(int *pData, unsigned int length, bool (*func)(int))
{
if(pData == nullptr || length == 0)
return;
int *pBegin = pData;
int *pEnd = pData + length - 1;
while(pBegin < pEnd)
{
// 向后移动pBegin
while(pBegin < pEnd && !func(*pBegin))
pBegin ++;
// 向前移动pEnd
while(pBegin < pEnd && func(*pEnd))
pEnd --;
if(pBegin < pEnd)
{
int temp = *pBegin;
*pBegin = *pEnd;
*pEnd = temp;
}
}
}
bool isEven(int n)
{
return (n & 1) == 0;
}
// ====================测试代码====================
void PrintArray(int numbers[], int length)
{
if(length < 0)
return;
for(int i = 0; i < length; ++i)
printf("%d\t", numbers[i]);
printf("\n");
}
void Test(char* testName, int numbers[], int length)
{
if(testName != nullptr)
printf("%s begins:\n", testName);
int* copy = new int[length];
for(int i = 0; i < length; ++i)
{
copy[i] = numbers[i];
}
printf("Test for solution 1:\n");
PrintArray(numbers, length);
ReorderOddEven_1(numbers, length);
PrintArray(numbers, length);
printf("Test for solution 2:\n");
PrintArray(copy, length);
ReorderOddEven_2(copy, length);
PrintArray(copy, length);
delete[] copy;
}
void Test1()
{
int numbers[] = {1, 2, 3, 4, 5, 6, 7};
Test("Test1", numbers, sizeof(numbers)/sizeof(int));
}
void Test2()
{
int numbers[] = {2, 4, 6, 1, 3, 5, 7};
Test("Test2", numbers, sizeof(numbers)/sizeof(int));
}
void Test3()
{
int numbers[] = {1, 3, 5, 7, 2, 4, 6};
Test("Test3", numbers, sizeof(numbers)/sizeof(int));
}
void Test4()
{
int numbers[] = {1};
Test("Test4", numbers, sizeof(numbers)/sizeof(int));
}
void Test5()
{
int numbers[] = {2};
Test("Test5", numbers, sizeof(numbers)/sizeof(int));
}
void Test6()
{
Test("Test6", nullptr, 0);
}
int main(int argc, char* argv[])
{
Test1();
Test2();
Test3();
Test4();
Test5();
Test6();
return 0;
}