This commit is contained in:
krahets
2023-03-15 03:12:57 +08:00
parent 000a583f92
commit 683e7ee872
7 changed files with 138 additions and 130 deletions
+3 -3
View File
@@ -141,10 +141,10 @@ comments: true
```zig title="my_heap.zig"
// 构造方法,根据输入列表建堆
fn init(self: *Self, allocator: std.mem.Allocator, nums: []const T) !void {
if (self.maxHeap != null) return;
self.maxHeap = std.ArrayList(T).init(allocator);
if (self.max_heap != null) return;
self.max_heap = std.ArrayList(T).init(allocator);
// 将列表元素原封不动添加进堆
try self.maxHeap.?.appendSlice(nums);
try self.max_heap.?.appendSlice(nums);
// 堆化除叶结点以外的其他所有结点
var i: usize = parent(self.size() - 1) + 1;
while (i > 0) : (i -= 1) {
+6 -6
View File
@@ -594,7 +594,7 @@ comments: true
```zig title="my_heap.zig"
// 访问堆顶元素
fn peek(self: *Self) T {
return self.maxHeap.?.items[0];
return self.max_heap.?.items[0];
}
```
@@ -855,7 +855,7 @@ comments: true
// 元素入堆
fn push(self: *Self, val: T) !void {
// 添加结点
try self.maxHeap.?.append(val);
try self.max_heap.?.append(val);
// 从底至顶堆化
try self.siftUp(self.size() - 1);
}
@@ -867,7 +867,7 @@ comments: true
// 获取结点 i 的父结点
var p = parent(i);
// 当“越过根结点”或“结点无需修复”时,结束堆化
if (p < 0 or self.maxHeap.?.items[i] <= self.maxHeap.?.items[p]) break;
if (p < 0 or self.max_heap.?.items[i] <= self.max_heap.?.items[p]) break;
// 交换两结点
try self.swap(i, p);
// 循环向上堆化
@@ -1247,7 +1247,7 @@ comments: true
// 交换根结点与最右叶结点(即交换首元素与尾元素)
try self.swap(0, self.size() - 1);
// 删除结点
var val = self.maxHeap.?.pop();
var val = self.max_heap.?.pop();
// 从顶至底堆化
try self.siftDown(0);
// 返回堆顶元素
@@ -1262,8 +1262,8 @@ comments: true
var l = left(i);
var r = right(i);
var ma = i;
if (l < self.size() and self.maxHeap.?.items[l] > self.maxHeap.?.items[ma]) ma = l;
if (r < self.size() and self.maxHeap.?.items[r] > self.maxHeap.?.items[ma]) ma = r;
if (l < self.size() and self.max_heap.?.items[l] > self.max_heap.?.items[ma]) ma = l;
if (r < self.size() and self.max_heap.?.items[r] > self.max_heap.?.items[ma]) ma = r;
// 若结点 i 最大或索引 l, r 越界,则无需继续堆化,跳出
if (ma == i) break;
// 交换两结点