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Thread: Edit distance

  1. #1
    Join Date
    May 2013
    Posts
    6

    Edit distance

    I tested my code for all the test cases and got correct answer but while submitting it on SPOJ, i am getting wrong answer. Can anyone help me in figuring out what's wrong with the code?

    Here is the link to the original problem: http://www.spoj.com/problems/EDIST/

    #include<stdio.h>
    #include<string.h>
    int main()
    {
    char a[3001],b[3001];
    int t,D[2][2005],A,B,LEFT,TOP,CORNER,temp,CURR,PREV;
    scanf("%d",&t);
    getchar();
    while(t--)
    {
    scanf("%s",&a);
    scanf("%s",&b);

    A=strlen(a);
    B=strlen(b);
    CURR=0;
    PREV=1;
    for(int i=0;i<B+1;i++)
    D[CURR][i]=i;

    for(int i=1;i<=A;i++)
    {

    CURR=(CURR+1)%2;
    PREV=(PREV+1)%2;
    D[CURR][0]=i;

    for(int j=1;j<=B;j++)
    {
    LEFT=D[CURR][j-1]+1;
    TOP=D[PREV][j]+1;
    if(a[i-1]==b[j-1])
    CORNER=D[PREV][j-1];
    else
    CORNER=D[PREV][j-1]+1;
    if(LEFT<TOP&&LEFT<CORNER) temp=LEFT;
    else if(TOP<LEFT&&TOP<CORNER) temp=TOP;
    else temp=CORNER;
    D[CURR][j]=temp;
    }
    }
    printf("%d\n",D[CURR][B]);
    }
    return 0;
    }

  2. #2
    2kaud's Avatar
    2kaud is offline Super Moderator Power Poster
    Join Date
    Dec 2012
    Location
    England
    Posts
    7,822

    Re: Edit distance

    Please would you format your code properly with indents etc before posting. Also would you use code tags (Go Advanced, select code, click '#'). The code as posted is just about unreadable.
    All advice is offered in good faith only. All my code is tested (unless stated explicitly otherwise) with the latest version of Microsoft Visual Studio (using the supported features of the latest standard) and is offered as examples only - not as production quality. I cannot offer advice regarding any other c/c++ compiler/IDE or incompatibilities with VS. You are ultimately responsible for the effects of your programs and the integrity of the machines they run on. Anything I post, code snippets, advice, etc is licensed as Public Domain https://creativecommons.org/publicdomain/zero/1.0/ and can be used without reference or acknowledgement. Also note that I only provide advice and guidance via the forums - and not via private messages!

    C++23 Compiler: Microsoft VS2022 (17.6.5)

  3. #3
    Join Date
    May 2013
    Posts
    6

    Re: Edit distance

    Code:
    #include<stdio.h>
    #include<string.h>
    int main()
    {
        char a[3001],b[3001];
        int t,D[2][2005],A,B,LEFT,TOP,CORNER,temp,CURR,PREV;
        scanf("%d",&t);
        getchar();
        while(t--)
        {
                  scanf("%s",&a);
                  scanf("%s",&b);
                  
                  A=strlen(a);
                  B=strlen(b);
                  CURR=0;
                  PREV=1;
                  for(int i=0;i<B+1;i++)
                          D[CURR][i]=i;
                  
                  for(int i=1;i<=A;i++)
                  {
                         
                          CURR=(CURR+1)%2;
                          PREV=(PREV+1)%2;
                          D[CURR][0]=i;
                          
                          for(int j=1;j<=B;j++)
                          {
                                  LEFT=D[CURR][j-1]+1;
                                  TOP=D[PREV][j]+1;
                                  if(a[i-1]==b[j-1])
                                                   CORNER=D[PREV][j-1];
                                  else
                                      CORNER=D[PREV][j-1]+1;
                                  if(LEFT<TOP&&LEFT<CORNER)           temp=LEFT;
                                  else if(TOP<LEFT&&TOP<CORNER)       temp=TOP;
                                  else                                temp=CORNER;
                                  D[CURR][j]=temp;        
                          }
                  }              
                printf("%d\n",D[CURR][B]);    
        }
        return 0;
    }

  4. #4
    Join Date
    May 2013
    Posts
    6

    Re: Edit distance

    got AC
    Still if anyone is trying to debug.. then it should be LEFT<=TOP instead of LEFT<TOP

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