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#include <iostream> #include <cstdio>
using namespace std;
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 == NULL || 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 == NULL || 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(int numbers[], int length) { 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; }
int main() { int numbers[] = {1, 2, 3, 4, 5, 6, 7}; Test(numbers, sizeof(numbers) / sizeof(int)); return 0; }
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