2856: 潜伏者

参考代码:

#include<stdio.h>

int main()

{

char before[100] = { 0 };

char after[100] = { 0 };

char ciphertext[100] = { 0 };

char output[100] = { 0 };

char alphabet[26] = { 0 };

gets(before);

gets(after);

gets(ciphertext);

int len = strlen(before);

int len_c = strlen(ciphertext);

for (int i = 0; i < len; i++)//write alphabet

{

if (alphabet[before[i] - 'A'] == 0)

alphabet[before[i] - 'A'] = after[i];

else if (after[i] != alphabet[before[i] - 'A'])

{

printf("Failed");

goto end;

}

}

for(int l=0;l<26;l++)//这里是检查字母表完整性，其实根本没必要；如果密文没有那个字母，我没必要翻译

if(alphabet[l]==0)

{

printf("Failed");

goto end;

}

for (int j = 0; j < len_c; j++)//translate

{

if(alphabet[ciphertext[j] - 'A']!=0)

output[j] = alphabet[ciphertext[j] - 'A'];

else

{

printf("Failed");

goto end;

}

}

for (int k = 0; k < len_c; k++)

printf("%c", output[k]);

end:

return 0;

}