浙大ACM 1006 WA 求助

[月光下的酒]

#include<stdio.h>
#include<string.h> 
#define MAX 70
int main(void){
	int k;
	char ciphertext[MAX];
	while(scanf("%d",&k)&&k!=0){
		//输入 
		getchar();
		gets(ciphertext);
		int n=strlen(ciphertext);
		int ciphercode[n];

		int plaincode[n];
		//得到密文数组 
		for(int i=0;i<n;i++){
			if(ciphertext[i]=='_')
				ciphercode[i]=0;
			else if(ciphertext[i]=='.')
				ciphercode[i]=27;
			else ciphercode[i]=ciphertext[i]-96;
		}

		//得到原文代码数组
		for(int i=0;i<n;i++){
			int a=0;
			while(a<=27){
				if(ciphercode[i]==(a-i)%28||ciphercode[i]==(a-i+28)%28)
					{
						int x=k*i;
						x=x%n;
						plaincode[x]=a;
						break;
						
					}
					a++;
			}
			
		} 
		//test
	//	for(int i=0;i<n;i++)
	//		printf("%d\n",plaincode[i]);
		//test
		for(int i=0;i<n;i++){
			char c;
			if(plaincode[i]==0)
				c='_';
			else if(plaincode[i]==27)
				c='.';
			else c=plaincode[i]+96;
			putchar(c);
			
		}
		putchar('\n');
		
		
	}
}

[月光下的酒]

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1006

[logiciel]

#include<stdio.h>
#include<string.h> 
//改 #define MAX 70
#define MAX 71
int main(void){
  int k;
  char ciphertext[MAX];
  while(scanf("%d",&k)&&k!=0){
    //输入 
    getchar();
    gets(ciphertext);
    int n=strlen(ciphertext);
    int ciphercode[MAX];//改 int ciphercode[n];

    int plaincode[MAX];//改 int plaincode[n];
    //得到密文数组 
    for(int i=0;i<n;i++){
      if(ciphertext[i]=='_')
        ciphercode[i]=0;
      else if(ciphertext[i]=='.')
        ciphercode[i]=27;
      else ciphercode[i]=ciphertext[i]-96;
    }

    //得到原文代码数组
    for(int i=0;i<n;i++){
      /*改 
      int a=0;
      while(a<=27){
        if(ciphercode[i]==(a-i)%28||ciphercode[i]==(a-i+28)%28)
        {
          int x=k*i;
          x=x%n;
          plaincode[x]=a;
          break;

        }
        a++;
      }*/
      plaincode[k*i%n] = (ciphercode[i]+i)%28;
    } 
    //test
    //	for(int i=0;i<n;i++)
    //		printf("%d\n",plaincode[i]);
    //test
    for(int i=0;i<n;i++){
      char c;
      if(plaincode[i]==0)
        c='_';
      else if(plaincode[i]==27)
        c='.';
      else c=plaincode[i]+96;
      putchar(c);

    }
    putchar('\n');


  }
}

[月光下的酒]

谢谢二楼！过了！