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为什么会runtime error呀~~~~~求救~~~~~

Posted by thegoldinsea at 2005-07-25 22:38:55 on Problem 1107
#include<stdio.h>
int scan(int i,int j,int b[],char a[])
{
    int k,v=-1;
    char n=i,m=j;
    if(i<115)
    {
      for(k=0;a[k]!='\0';k++)
        if(a[k]>=n&&a[k]<=m)
          b[++v]=k;
    }
    else
    {
        for(k=0;a[k]!='\0';k++)
        {   if(a[k]>=n&&a[k]<=m||a[k]=='_')
               b[++v]=k;
        }
    }
    return v;
}
int main()
{
    char a[81],d[10],t;
    int b[10]={0},c[10]={0};
    int k[4];
    int i,j,v;
    scanf("%d%d%d",&k[1],&k[2],&k[3]);
    while(k[1]!=0&&k[2]!=0&&k[3]!=0)
    {
        scanf("%s",a);
        for(i=1;i<=3;i++)
        {
            switch(i)
            {
                case 1:v=scan(97,105,b,a);break;
                case 2:v=scan(106,114,b,a);break;
                case 3:v=scan(115,122,b,a);break;
            }
            if(v>-1)
            {
              for(j=0;j<=v;j++)
              {
                c[(j+k[i]+1)%(v+1)]=b[(j+1)%(v+1)];
                d[(j+k[i]+1)%(v+1)]=a[c[(j+k[i]+1)%(v+1)]];
              }
              for(j=0;j<=v;j++)
                a[b[j]]=d[j];
            }
        }
        puts(a);
        scanf("%d%d%d",&k[1],&k[2],&k[3]);
    }
    return 0;
}

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