七大排序

七大排序算法

冒泡排序

选择排序

插入排序

堆排序

归并排序

快速排序

希尔排序

冒泡排序

void bubbleSort(int *a, int length){
	for(int i = 0; i < length; i++){
		for(int j = i+1; j < length; j++){
			if (a[i] > a[j]){
				int temp = a[i];
				a[i] = a[j];
				a[j] = temp;
			}
		}
	}
}

选择排序

void  selectionSort(int *a, int length){
	for(int i = 0; i < length; i++){
		int k = i;
		for(int j = i+1; j < length; j++){
			if(a[k] > a[j]){
				k = j;
			}
		}
		int temp = a[i];
		a[i] = a[k];
		a[k] = temp;
	}
} 

插入排序

void insertSort(int *a, int length){
	/*
	for(int i = 1; i < length; i++){
		for(int j = i; j >= 0; j--){
			if(a[j] < a[j-1]){
				int temp = a[j];
				a[j] = a[j-1];
				a[j-1] = temp;
			}else{
				break;
			}
		}
	}*/
	for(int i = 1; i < length; i++){
		int it = a[i];
		int index = i-1;
		while(index >= 0 && it < a[index]){
			a[index+1] = a[index];
			index--;
		}
		a[index+1] = it;
	}
} 

堆排序

void headSort(int *a, int length){
	
} 

归并排序

void merage(int *a, int left, int center, int right){
	int tp[right-left];
	int begin = left;
	int mid = center+1;
	int index = 0;
	while(begin <= center && mid <= right){
		if(a[begin] >= a[mid]){
			tp[index++] = a[mid++];
		}else{
			tp[index++] = a[begin++];
		}
	}
	while(begin <= center){
		tp[index++] = a[begin++];
	}
	while(mid <= right){
		tp[index++] = a[mid++];
	}
	for(int i = left; i <= right; i++){
		a[i] = tp[i-left];
	}
}
void merageSort(int *a, int left, int right){
	if(left >= right){
		return;
	}
	int center = (left + right)/2;
	merageSort(a, left, center);
	merageSort(a, center+1, right);
	merage(a, left, center, right);
}

快速排序

//	快速排序
void quickSort(int *a, int low, int high){
	/*
	int start = low;
	int end = high;
	int key = a[low];
	while(end > start){
		while(end > start && a[end] >= key){
			end--;
		}
		if(a[end] <= key){
			int temp = a[end];
			a[end] = a[start];
			a[start] = temp;
		}
		while(end > start && a[start] <= key){
			start++;
		}
		if(a[start] >= key){
			int temp = a[start];
			a[start] = a[end];
			a[end] = temp;
		}
	}
	if(start > low){
		quickSort(a, low, start-1);
	}
	if(end < high){
		quickSort(a, end+1, high);
	}*/
	if(low >= high){
		return;
	}
	int start = low;
	int end = high-1;
	int key = a[high];
	while(end > start){
		while(end > start && a[start] <= key){
			start++;
		}
		while(end > start && a[end] >= key){
			end--;
		}
		if(end > start){
			int temp = a[start];
			a[start] = a[end];
			a[end] = temp;
		}
	}
	if(start == end && a[start] > key){
		a[high] = a[start];
		a[start] = key;
	}
	if(start > low){
		quickSort(a, low, start-1);
	}
	if(end < high){
		quickSort(a, end+1, high);
	}
}

希尔排序

//	希尔排序 
void shellSort(int *a, int length){
	
}

主函数

int main(){
	int a[7] = {11, 14, 90, 34, 67, 12, 68};
	quickSort(a, 0, 6);
	//merageSort(a, 0, 6);
	//insertSort(a, 7);
	//selectionSort(a, 7);
	//bubbleSort(a, 7);
	for(int i = 0; i < 7; i++){
		printf("%d ", a[i]);
	}
	return 0;
}