#include <iostream>
using namespace std;

void txsort(int* arr, int len) {
	if (!arr || len == 1) {
		return;
	}
	int negCount = 0;
	for (int i = 0; i < len; ++i) {
		if (arr[i] < 0) {
			negCount++;
		}
	}

	int swapingId = 0;
	int fixNegId = 0;
	int toSwapId = 0;
	for (int i = 0; i < len; ++i) {
		swapingId = (i - fixNegId) % (negCount - fixNegId) + fixNegId;
		toSwapId = i + negCount - fixNegId;

		/*arr[swapingId] < 0说明此处的负数未固定,
		 *  将带交换元素下标定位至待固定元素下标
		 */
		if (arr[swapingId] < 0) {
			toSwapId = fixNegId;
			fixNegId++;
		}

		swap(arr[swapingId], arr[toSwapId]);

		if (fixNegId == negCount) {
			break;
		}
	}
}