随机生成文本程序

昨天看编程珠玑，写了一个随机生成文本的程序

in.txt是读入的文本 输出一个文本 可以是根据in.txt的内容随机出来的

/*----------------------------------------随机生成文本程序2011.3.15 by LiWang112358----------------------------------------*/#include <iostream>#include <time.h>using namespace std;int k = 2;char inputchars[5000000];char * word[1000000];int nword = 0;int cmp(char * p,char * q){int n = k;for (; *p == *q; p ++ ,q ++)if ( 0 == *p && -- n == 0)return 0;return *p - *q;}int sortcmp(const void * p,const void * q){return cmp((char *)p,(char *)q) <= 0;}void myQsort(char * a[],int l,int r){ int i,j;char * s = a[l]; i=l; j=r; while (i<=j) { while (cmp(a[i],s) < 0 && i<=j) i++; while (cmp(a[j],s) > 0 && i<=j) j--; if (i<=j) { swap(a[i],a[j]); i++; j--; } } if (i<r) myQsort(a,i,r); if (l<j) myQsort(a,l,j);}int find(int begin,int end,char * x,char * a[]) // 二分查找{int l = begin,r = end,mid = (l + r) >> 1;while (l <= r){if (strcmp(a[mid],x) < 0) l = mid + 1;else if (strcmp(a[mid],x) > 0) r = mid - 1;else if (strcmp(a[mid],x) == 0){while (mid > 0 && strcmp(a[mid],a[mid - 1]) == 0) --mid;return mid;}mid = (l + r) >> 1;}return -1;}char * skip(char * p,int num){for (int i = 0; i < num ; ++ i){for (; (*p) > 0; ++ p);p++;}return p;}int main(){freopen("in.txt","r",stdin);memset(inputchars,0,sizeof(inputchars));word[0] = inputchars;while (scanf("%s",word[nword]) != EOF){word[nword + 1] = word[nword] + strlen(word[nword]) + 1;nword ++;}for (int i = 0; i < k; ++ i)word[nword][i] = 0;myQsort(word,0,nword - 1);srand(int(time(0)));char * p = inputchars;for (int i = 0; i < 10000; ++ i){printf("%s ",p);if ( i > 0 && i % 20 == 0) printf("/n");int pos = find(0,nword - 1,p,word);int j = 0;for (j = 0; strcmp(p,word[pos + j]) == 0 && pos + j < nword; ++ j);int rd = abs(rand()) % j;p = word[pos + rd];p = skip(p,1);if (strlen(skip(p,k - 1)) == 0) break;}return 0;}