【POJ 1035】Spell checker

#include<stdio.h>
#include<cstring>
char c[17],dictionary[10005][17],words[52][17],print[10005];
int n,num,len,correct,l[10005],printlen;
void add(int i)
{
    print[printlen++]=' ';
    for(int p=0; p<l[i]; p++)
        print[printlen+p]=dictionary[i][p];
    printlen+=l[i];
}
int main()
{
    while(scanf("%s",c)&&c[0]!='#')
    {
        for(len=0; c[len]; len++)
            dictionary[num][len]=c[len];
        l[num]=len;
        num++;
    }

    while(scanf("%s",words[n])&&words[n][0]!='#')
    {
        printf("%s",words[n]);
        for(len=0; words[n][len]; len++);
        correct=printlen=0;
        memset(print,0,sizeof(print));
        for(int i=0; i<num&&!correct; i++)
        {
            if(l[i]>=len-1)
            {
                int j=0;
                while(j<len&&dictionary[i][j] ==words[n][j]) j++;
                if(j==len&&l[i]==len)
                    correct=1;
                else
                {
                    if(l[i]==len)
                    {
                        while(j<len&&dictionary[i][j+1] ==words[n][j+1])j++;//替换
                        if(j==len)
                            add(i);
                    }
                    if(l[i]==len-1)
                    {
                        while(j<len-1&&dictionary[i][j] ==words[n][j+1])j++;//删除
                        if(j==len-1)
                            add(i);
                    }
                    if(l[i]==len+1)
                    {
                        while(j<len&&dictionary[i][j+1] ==words[n][j])j++;//添加
                        if(j==len)
                            add(i);
                    }
                }
            }
        }
        if(correct) printf(" is correct\n");
        else printf(":%s\n",print);
        n++;
    }
    return 0;
}