在具体的操作前添加!符号，好吧，这又是什么诡异的语法?!
let digit = sender.currentTitle!
这里的!表示“我确定这里的的strValue一定是非nil的，尽情调用吧”
，例如
if userIsInTheMiddleOfTypingANumber { //== true
display.text = display....
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编程语言 时间：
2015-01-30 00:09:09
阅读次数：
261
windy数基本的数位DP，需要判断当前位是否为起始位。#include #include #include using namespace std;#define D(x) xconst int MAX_DIGIT = 35;int n, m;int f[MAX_DIGIT];int memoiz...
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其他好文 时间：
2015-01-29 21:03:35
阅读次数：
192
基本的数位dp#include #include using namespace std;#define D(x) xconst int MAX_DIGIT = 66;long long n;int f[MAX_DIGIT];long long memoize[MAX_DIGIT][2][2][2]...
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其他好文 时间：
2015-01-29 20:59:06
阅读次数：
248
题目： Specialized Four-Digit NumbersTime Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 2027 Accepted Submission(s): 1349 Problem DescriptionFind a...
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其他好文 时间：
2015-01-28 13:01:52
阅读次数：
169
题目链接：Add Two Numbers
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers a...
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其他好文 时间：
2015-01-27 23:36:05
阅读次数：
373
描述：
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse
order and each of their nodes contain a single digit. Add the two numbers and return it ...
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其他好文 时间：
2015-01-27 20:23:35
阅读次数：
154
Power digit sum
Problem 16
215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26.
What is the sum of the digits of the number 21000?
Answer:
1366
Co...
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编程语言 时间：
2015-01-27 13:22:36
阅读次数：
158
Large sum
Problem 13
Work out the first ten digits of the sum of the following one-hundred 50-digit numbers.
37107287533902102798797998220837590246510135740250
463769376774900097126481248969...
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编程语言 时间：
2015-01-27 11:11:17
阅读次数：
284
Largest palindrome product
Problem 4
A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99.
Find the largest p...
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编程语言 时间：
2015-01-27 09:34:40
阅读次数：
223
You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a link...
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其他好文 时间：
2015-01-27 09:29:46
阅读次数：
186
