在这方面我没有得到所有路径和偏移限制 [英] In this I am not getting all paths and offset limits

问题描述

想象一下，机器人坐在NxN网格的左上角。机器人只能向三个方向移动：向右，向下和对角向下。机器人必须到达NxN网格的右下角。想象一下，某些方块是禁区或偏移，这样机器人就无法踩到它们。编写一个程序来确定机器人可能的路径数。







输入和输出格式：



请参阅样本输入和输出以了解格式规范。



偏移点的输入在结束时结束用户输入坐标为（-1，-1）。



所有粗体文本对应输入，其余对应输出。







样品输入和输出1：



输入尺寸电网



3







输入偏移的网格点



0 1



-1 -1







机器人的路径是



（0,0） - （1,0） - （2,0） - （2,1） - （2,2）



（0,0） ） - （1,0） - （1,1） - （2,1） - （2,2）



（0,0） - （1 ，0） - （1,1） - （1,2） - （2,2）



（0,0） - （1,0） - （ 1,1） - （2,2）



（0,0） - （1,0） - （2,1） - （2,2）< br $>


（0,0） - （1,1） - （2,1） - （2,2）



（0,0） - （1,1） - （1,2） - （2,2）



（0,0） - （ 1,1） - （2,2）





样本输入和输出2：



输入网格大小



-7



无效输入



我尝试过：

Imagine a robot sitting on the upper left hand corner of an NxN grid. The robot can only move in three directions: right , down and diagonally down. The robot has to reach the lower right hand corner of the NxN grid. Imagine certain squares are "off limits" or "offsets", such that the robot cannot step on them. Write a program to determine the number of possible paths for the robot.



Input and Output Format:

Refer sample input and output for formatting specifications.

The entry of offset points ends when the user enters the coordinates as (-1,-1).

All text in bold corresponds to input and the rest corresponds to output.



Sample Input and Output 1:

Enter the size of the grid

3



Enter the grid points that are offsets

0 1

-1 -1



The paths for the robot are

( 0 , 0 ) - ( 1 , 0 ) - ( 2 , 0 ) - ( 2 , 1 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 0 ) - ( 1 , 1 ) - ( 2 , 1 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 0 ) - ( 1 , 1 ) - ( 1 , 2 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 0 ) - ( 1 , 1 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 0 ) - ( 2 , 1 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 1 ) - ( 2 , 1 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 1 ) - ( 1 , 2 ) - ( 2 , 2 )

( 0 , 0 ) - ( 1 , 1 ) - ( 2 , 2 )


Sample Input and Output2:

Enter the size of the grid

-7

Invalid Input

What I have tried:

#include<stdio.h>
#include<stdlib.h>
int ch,a[100];
static int i=0;
void path(int u,int v,int n,char arr[],size_t s,size_t p)
{
    ch=1;
    if(u==(n-1)&& v==(n-1))
    {
        p+=snprintf(arr+p,s-p,"(%d , %d)",u,v);
    }
    else
    {
      p+=snprintf(arr+p,s-p,"(%d , %d)-",u,v);   
    }
    if(p>=s)
    {
        fprintf(stderr,"small path");
        exit(1);
    }
    if(u==n-1&&v==n-1)
    {
        printf("%s",arr);
    }
    else
    {
        if(u<n-1)
        {
            path(u+1,v,n,arr,s,p);
        }
        if(u<n-1&&v<n-1)
        {
            path(u+1,v+1,n,arr,s,p);
        }
    }
}
void main()
{
    char arr[1000];
    int size;
    printf("Enter the size of the grid\n");
    scanf("%d",&size);
    if(size<=0)
    {
        printf("Invalid Input");
        exit(1);
    }
    printf("Enter the grid points that are offsets\n");
    here1: scanf("%d %d",&a[i],&a[i+1]);
    if(a[i]==-1&&a[i+1]==-1)
    {
        goto here;
    }
    else
    {
        i+=2;
        goto here1;
    }
    here: printf("The paths for the robot are\n");
    i=0;
    path(0,0,size,arr,sizeof arr,0);


    }

推荐答案

这是你的功课，让它正常工作是其中的一部分task：一个名为 debugging 的进程。当与昨天的问题相结合时，你似乎没有为此付出太多努力，所以最好的办法是让你开始使用调试器 - 编译并不意味着你的代码是正确的！ ：笑：

将开发过程想象成编写电子邮件：成功编译意味着您使用正确的语言编写电子邮件 - 例如英语而不是德语 - 而不是电子邮件包含您的邮件想发送。



所以现在你进入第二阶段的发展（实际上它是第四或第五阶段，但你将在之后的阶段进入）：测试和调试。



首先查看它的作用，以及它与你想要的有何不同。这很重要，因为它可以为您提供有关其原因的信息。例如，如果程序旨在让用户输入一个数字并将其翻倍并打印答案，那么如果输入/输出是这样的：

This is your homework, and getting it working is part of the task: a process called debugging. When combined with yesterdays question, you don;t seem to be putting much effort of your own into this, so the best thing to do is get you started with the debugger - compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

然后很明显问题出在将它加倍的位 - 它不会将自身加到自身上，或者将它乘以2，它会将它自身相乘并返回输入的平方。

所以，你可以查看代码和很明显，它在某处：

Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:

private int Double(int value)
   {
   return value * value;
   }

一旦你知道可能出现的问题，就开始使用teh调试器找出原因。在你的行上设一个断点：

Once you have an idea what might be going wrong, start using teh debugger to find out why. Put a breakpoint on your line:

myaverage.DisplayAverage();

并运行你的应用程序。在执行代码之前，请考虑代码中的每一行应该做什么，并将其与使用Step over按钮依次执行每一行时实际执行的操作进行比较。它符合您的期望吗？如果是这样，请转到下一行。

如果没有，为什么不呢？它有何不同？



这是一项非常值得开发的技能，因为它可以帮助你在现实世界和发展中。和所有技能一样，它只能通过使用来改善！



是的，我可能会告诉你问题是什么 - 但这并不难做到，你会在同一时间学到一些非常值得的东西！

and run your app. Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?

This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!

Yes, I could probably tell you what "the problem" is - but it's not difficult to do this yourself, and you will learn something really worthwhile at the same time!

这个问题已存在多年，一点搜索会给你很多资源。

你不要不明白你的代码没有做到你期望的原因，解决方案是使用调试器并查看代码是如何工作的。



有一个工具允许您查看代码正在执行的操作，其名称为调试程序。它也是一个很好的学习工具，因为它向你展示了现实，你可以看到哪种期望与现实相符。

当你不明白你的代码在做什么或为什么它做它做的时候，答案就是答案是调试器。

使用调试器查看代码正在执行的操作。只需设置断点并查看代码执行情况，调试器允许您逐行执行第1行并在执行时检查变量。



调试器 - 维基百科，免费的百科全书 [ ^ ]



掌握Visual Studio 2010中的调试 - 初学者指南 [ ^ ]

使用Visual Studio 2010进行基本调试 - YouTube [ ^ ]

调试器在这里向您展示您的代码正在做什么，您的任务是与什么进行比较应该这样做。

调试器中没有魔法，它没有找到错误，它只是帮助你。当代码没有达到预期的效果时，你就会接近一个错误。

This problem have been around for years, a little search will give you numerous resources.
You don't understand the reason why your code do not do what you expect, the solution is to use the debugger and look at how the code works.

There is a tool that allow you to see what your code is doing, its name is debugger. It is also a great learning tool because it show you reality and you can see which expectation match reality.
When you don't understand what your code is doing or why it does what it does, the answer is debugger.
Use the debugger to see what your code is doing. Just set a breakpoint and see your code performing, the debugger allow you to execute lines 1 by 1 and to inspect variables as it execute.

Debugger - Wikipedia, the free encyclopedia[^]

Mastering Debugging in Visual Studio 2010 - A Beginner's Guide[^]
Basic Debugging with Visual Studio 2010 - YouTube[^]
The debugger is here to show you what your code is doing and your task is to compare with what it should do.
There is no magic in the debugger, it don't find bugs, it just help you to. When the code don't do what is expected, you are close to a bug.

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