# include <stdio.h>
# include <string.h>

main(){
	int key,len,i,temp;
	char code[75],plain[75];
	while (scanf("%d",&key),key){
		scanf("%s",code);
		len=strlen(code);
		plain[len]=0;
		for (i=0;i<len;i++){
			switch (code[i]){
			case '_' :	temp=(1+i)%28;break;
			case '.' : 	temp=(27+i)%28;break;
			default	 :	temp=(code[i]-'a'+1+i)%28;
			}
			switch (temp){
			case 0  :	plain[(i*key)%len]='_';break;
			case 27 :	plain[(i*key)%len]='.';break;
			default :	plain[(i*key)%len]=temp+'a'-1;
			}
		}
		puts(plain);
	}
}

• Re:谁能帮忙看一下,为什么会WA (598) 190506040 2020-06-07 14:27:02