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How to find all combinations of coins when given some dollar value
...needs a slight correction because it asks "...using 1-, 10-, 25-, 50-, and 100-cent coins?" But then the write up defines the set a as the domain of f but a = {1,5,10,25,50,100}. There should be a 5- in the cent coins list. Otherwise the write up was fantastic, thanks!
– rbrtl
...
How to change the DataTable Column Name?
...
<StudentID>1</StudentID>
<CourseID>100</CourseID>
<SubjectCode>MT400</SubjectCode>
<Marks>80</Marks>
</StudentMarks>
<StudentMarks>
<StudentID>1</StudentID>
...
LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
在模型窗口中输入如下代码：
min=2*x1+3*x2;
x1+x2>=350;
x1>=100;
2*x1+x2<=600;
然后点击工具条上的按钮 即可。
例1.2 使用LINGO软件计算6个发点8个收点的最小费用运输问题。产销单位运价如下表。
销地
产地
B1
...
How to change the opacity (alpha, transparency) of an element in a canvas element after it has been
...canvas.getContext("2d");
timerId = setInterval("fadeIn()", 100);
}
function fadeIn()
{
context.clearRect(0,0, canvas.width,canvas.height);
context.globalAlpha = ga;
var ie = new Image();
...
pandas three-way joining multiple dataframes on columns
...
+100
This is an ideal situation for the join method
The join method is built exactly for these types of situations. You can join any num...
How to get all subsets of a set? (powerset)
...noticed it was significantly slower. To generate the power set of 16 items 100 times, my measurements were 0.55 versus 15.6.
– Ceasar Bautista
Feb 23 '18 at 7:40
...
Why doesn't await on Task.WhenAll throw an AggregateException?
... }
}
}
public async Task<int> A()
{
await Task.Delay(100);
throw new Exception("A");
}
public async Task<int> B()
{
await Task.Delay(100);
throw new Exception("B");
}
The key is to save a reference to the aggregate task before you await it, then you can acc...
Render HTML to an image
...vas')
const ctx = canvas.getContext('2d')
canvas.width = canvas.height = 100
const tempImg = document.createElement('img')
tempImg.addEventListener('load', onTempImageLoad)
tempImg.src = 'data:image/svg+xml,' + encodeURIComponent('<svg xmlns="http://www.w3.org/2000/svg" width="100" height=...
How to center an element horizontally and vertically
...browser support (see example).
html, body, .container {
height: 100%;
}
.container {
display: -webkit-flexbox;
display: -ms-flexbox;
display: -webkit-flex;
display: flex;
-webkit-flex-align: center;
-ms-flex-align: center;
-webkit-align-items: center...
Shorten string without cutting words in JavaScript
...ite("20: " + t.replace(/^(.{20}[^\s]*).*/, "$1") + "\n");
document.write("100: " + t.replace(/^(.{100}[^\s]*).*/, "$1") + "\n");
</script>
Output:
1: this
2: this
5: this is
11: this is a longish
20: this is a longish string
100: this is a longish string of text
...