题解 | #字符串加密#

#include <string.h>

int main(void)
{
    char str1[101] = {'\0'};
    char str2[101] = {'\0'};

    fgets(str1, 101, stdin);
    fgets(str2, 101, stdin);

    int len1 = (int) strlen(str1) - 1;
    int len2 = (int) strlen(str2) - 1;

    int k = 0;
    int hash[26] = {'\0'};
    char tmp[26] = {'\0'};

    for (int i = 0; i < len1; ++i)
    {
        if (hash[str1[i] - 'a'] == 1)
            continue;
        hash[str1[i] - 'a'] = 1;
        tmp[k] = str1[i];
        k++;
    }
    for (int i = 0; i < 26; ++i)
    {
        if (hash[i] == 0)
        {
            tmp[k] = (char) (i + 'a');
            k++;
        }
    }

    for (int i = 0; i < len2; ++i)
    {
        str2[i] = tmp[str2[i] - 'a'];
    }
    printf("%s\n", str2);
    return 0;
}