if(qb==NULL || qa && qa->mi<qb->mi)
时间: 2023-11-07 20:34:46 浏览: 37
I'm sorry, I am unable to answer that question. It does not seem to be a complete or coherent question. Can you please provide more context or clarity?
相关问题
Polyn MultiplyPolyn(Polyn pa, Polyn pb) { //求解并建立多项式a*b,返回其头指针 Polyn hf; Polyn pf; Polyn qa = pa -> next; Polyn qb = pb -> next; hf = (Polyn)malloc(sizeof(struct Polynomial));//建立头结点 hf -> next = NULL; for(;qa;qa = qa->next) { for(qb = pb -> next;qb;qb = qb -> next) { pf = (Polyn)malloc(sizeof(struct Polynomial)); pf -> coef = qa -> coef * qb -> coef; pf -> expn = qa -> expn + qb -> expn; Insert(pf, hf);//调用Insert函数以合并指数相同的项 } } return hf; }从时间、空间复杂度上分析算法效率,或者从其它算法主要评价指标进行分析,
该算法的时间复杂度为O(n^2),其中n为多项式的项数。这是因为算法使用了两个循环嵌套,每次都需要遍历整个多项式,因此总的时间复杂度为n*n=n^2。
空间复杂度方面,算法需要额外的空间来存储结果多项式,以及每次循环中需要动态分配的节点。每个节点需要存储系数和指数,因此总的空间复杂度也为O(n^2)。
综上所述,该算法的效率不是很高,特别是在对大规模多项式进行运算时,会出现较明显的时间和空间瓶颈。如果需要处理大规模多项式,可以考虑使用更高效的算法,如快速傅里叶变换(FFT)算法或者Karatsuba算法。
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>小精灵转呀转~</title> <style> * { list-style: none; margin: 0; padding: 0; } .box2 { width: 260px; height: 190px; margin: 100px auto; /* background-color: skyblue; */ } .box2 li { float: left; width: 24px; height: 24px; background-color: pink; margin: 10px 0 30px 30px; background: url(qb.png) no-repeat; } </style> </head> <body> <div class="box2"> <ul> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> <li></li> </ul> </div> <script> var change = document.querySelectorAll('li'); for (var i = 0; i < change.length; i++) { var index = i * 44; change[i].style.backgroundPosition = '0 -' + index + 'px'; } </script> </body> </html>用其他方法实现这个效果,至少三种
这段 HTML + CSS + JavaScript 代码实现的效果是将一张包含了多个小图片的图片作为背景,然后通过 JavaScript 代码实现将每个小图片的位置进行调整,从而实现一个转盘的效果。
下面是三种用其他方法实现这个效果的方式:
1. 用 CSS3 动画实现转盘效果
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>小精灵转呀转~</title>
<style>
* {
list-style: none;
margin: 0;
padding: 0;
}
.box2 {
width: 260px;
height: 190px;
margin: 100px auto;
position: relative;
}
.box2 ul {
position: absolute;
top: 0;
left: 0;
animation: rotate 5s linear infinite;
}
.box2 li {
width: 24px;
height: 24px;
background-color: pink;
background: url(qb.png) no-repeat;
position: absolute;
left: 50%;
top: 50%;
transform: translate(-50%, -50%);
}
@keyframes rotate {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="box2">
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
</body>
</html>
```
2. 用 Canvas 实现转盘效果
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>小精灵转呀转~</title>
<style>
* {
list-style: none;
margin: 0;
padding: 0;
}
.box2 {
width: 260px;
height: 190px;
margin: 100px auto;
position: relative;
}
.box2 canvas {
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div class="box2">
<canvas id="canvas" width="260" height="190"></canvas>
</div>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var img = new Image();
img.src = 'qb.png';
img.onload = function() {
var count = 0;
setInterval(function() {
count += 44;
if (count >= 528) {
count = 0;
}
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.drawImage(img, 0, count, 24, 24, 118, 82, 24, 24);
}, 100);
}
</script>
</body>
</html>
```
3. 用 SVG 实现转盘效果
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>小精灵转呀转~</title>
<style>
* {
list-style: none;
margin: 0;
padding: 0;
}
.box2 {
width: 260px;
height: 190px;
margin: 100px auto;
position: relative;
}
.box2 svg {
position: absolute;
top: 0;
left: 0;
transform-origin: 50% 50%;
animation: rotate 5s linear infinite;
}
@keyframes rotate {
from {
transform: rotate(0deg);
}
to {
transform: rotate(360deg);
}
}
</style>
</head>
<body>
<div class="box2">
<svg viewBox="0 0 24 528" width="24" height="528">
<use xlink:href="#icon"></use>
</svg>
<svg style="display: none;">
<symbol id="icon">
<image href="qb.png" width="24" height="528"></image>
</symbol>
</svg>
</div>
</body>
</html>
```
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