(eden)Delete character

Description:

Description

In this exercise, you will get two strings A and B in each test group and the length of every string is less than 40, you need to delete all characters which are contained in string B from string A.

The character may be space or letter.

Input

first line is a number n(0<n<=50), which stands for the number of test data.

the next 2*n lines contain 2*n strings, and each group of test data contain two strings A and B. There may be space in both A and B.

Output 

string A after delete characters, and each output is split by " "

if string A is null after delete, you just need to print " "

Sample Input

3

WE are family

aeiou

qwert

asdfg

hello world

e l

Sample Output

WE r fmly

qwert

howrd

Hint:

the string contains space, so you may need to use fgets() to input a string.

Capital letter and small letter cannot be ignored.

代码

#include<stdio.h>
#include<string.h>
int main() {
    int n, j, i;
    scanf("%d", &n);
    getchar();
    while (n--) {
        char ch[50] = "0", result[50] = "0", ch1[50] = "0";
        char t;
        fgets(ch, 50, stdin);
        int k = strlen(ch);
        fgets(ch1, 50, stdin);
        int k2 = strlen(ch1);
        int tot = 0;
        for (i = 0; i < k + 1; i++) {
            int b = 0;
            for (j = 0; j < k2 + 1; j++) {
                if (ch1[j] == ch[i]) {
                    b = 1;
                }
            }
            if (b == 0) {
                result[++tot] = ch[i];
            }
        }
        for (i = 1; i <= tot; i++) {
            printf("%c", result[i]);
        }
        printf("
");
    }
}

标答

1.#include<stdio.h>
2.#include<string.h>
3. 
4.#define NUMBER 256
5. 
6.void Delete(char *first, char *second) {
7.        int i;
8.        int hashtable[NUMBER];
9.        for (i = 0; i < NUMBER; i++)
10.                hashtable[i]=0;
11. 
12.        char *p = second;
13.        while (*p) {
14.                hashtable[*p]=1;
15.                p++;
16.        }
17. 
18.        char *slow = first;
19.        char *fast = first;
20.        while (*fast) {
21.                if (hashtable[*fast] == 0) {
22.                        *slow=*fast;
23.                        slow++;
24.                }
25.                fast++;
26.        }
27.        *slow='';
28.}
29. 
30.int main() {
31.        int num;
32.        char temp[50];
33.        scanf("%d", &num);
34.        fgets(temp, 50, stdin);
35.        while (num--) {
36.                char first[50];
37.                char second[50];
38.                fgets(first, 50, stdin);
39.                fgets(second, 50, stdin);
40.                if (first == NULL) {
41.                        printf("
");
42.                        continue;
43.                }
44.                Delete(first, second);
45.                printf("%s
", first);
46.        }
47.        return 0;
48.}