#include <stdio.h>#include <string.h>#include <stdlib.h>char keys[11];char flag[11];char line[101];char plaintext[101];void Decrypt(){ int i,index,column, count,keysLength, lineLength; char c; memset(flag, 0, sizeof(flag)); lineLength=strlen(line); keysLength=strlen(keys); count=lineLength/keysLength; plaintext[lineLength]=0; for(column=0;column<keysLength;column++) { c='Z'+1; for(i=0;i<keysLength;i++) if(flag[i]==0 && keys[i]<c) c=keys[i],index=i; flag[index]=1; for(i=0;i<count;i++) { plaintext[keysLength*i + index]=line[count*column+i]; } } }int main(){ while(1) { gets(keys); if(strcmp(keys,"THEEND")==0) break; gets(line); Decrypt(); printf("%sn", plaintext); }}
