[英]Project euler 8: weird issue
I've tried solving Project Euler Problem 8 I believe I have the right approach, but for some reason I get the exception ("An unhandled exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll") in below code when i=494
. 我已经尝试解决Project Euler 问题8,我相信我有正确的方法,但是由于某些原因,在以下代码中,当i=494
。 Line is 38 I believe. 我相信线是38。
PS. PS。 The length of the string is 1000 as shown by debugger too. 字符串的长度也是1000,如调试器所示。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace euler8
{
class Program
{
static void Main(string[] args)
{
const String candidate = "73167176531330624919225119674426574742355349194934"+
"96983520312774506326239578318016984801869478851843"+
"85861560789112949495459501737958331952853208805511"+
"12540698747158523863050715693290963295227443043557"+
"66896648950445244523161731856403098711121722383113"+
"62229893423380308135336276614282806444486645238749"+
"30358907296290491560440772390713810515859307960866"+
"70172427121883998797908792274921901699720888093776"+
"65727333001053367881220235421809751254540594752243"+
"52584907711670556013604839586446706324415722155397"+
"53697817977846174064955149290862569321978468622482"+
"83972241375657056057490261407972968652414535100474"+
"82166370484403199890008895243450658541227588666881"+
"16427171479924442928230863465674813919123162824586"+
"17866458359124566529476545682848912883142607690042"+
"24219022671055626321111109370544217506941658960408"+
"07198403850962455444362981230987879927244284909188"+
"84580156166097919133875499200524063689912560717606"+
"05886116467109405077541002256983155200055935729725"+
"71636269561882670428252483600823257530420752963450";
long max = 0;
int length = candidate.Length;
for (int i = 0; i < length - 13; i++)
{
string substring = candidate.Substring(i, i + 13);
int [] x = new int [13];
for(int j = 0; j<13; j++)
x[j]= int.Parse(substring[j].ToString());
long product = 1;
for (int k = 0; k < 13; k++)
product = product * x[k];
if (product > max)
max = product;
}
Console.WriteLine(max.ToString());
}
}
}
Does anyone spot the issue? 有人发现这个问题吗?
It looks like this is stemming from a misunderstanding of how .SubString()
works. 看来这是由于对.SubString()
工作方式有误解。
string substring = candidate.Substring(i, i + 13);
Most likely should be: 最有可能应该是:
string substring = candidate.Substring(i, 13);
.SubString()
is : .SubString(startPosition, length)
So adding i + 13
doesn't net you the next 13 characters, but instead the next i + 13
characters from start position i
. .SubString()
是: .SubString(startPosition, length)
因此,添加i + 13
不会为您带来下13个字符,而是从起始位置i
开始的下i + 13
字符。
String.Substring needs a starting position plus a length , not and end position. String.Substring需要一个开始位置加上一个length ,而不是结束位置。
So just use 所以就用
string substring = candidate.Substring(i, 13);
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