uva 1339 Ancient Cipher

大意:
读入两个字符串(都是大写字母),字符串中字母的顺序可以随便排列。
现在希望有一种字母到字母的一一映射,从而使得一个字符串可以转换成另一个字符串(字母可以随便排列)
有,输出YES;否,输出NO;
exp:

输入
HAHA
HEHE

输出
YES

可以将A→E,或E→A;

关键在于,问题简化:
因为不用考虑字母位置,所以可以分别统计两个字符串中不同字母出现次数,计入数组counts1和counts2。
那么,怎么知道谁和谁对应呢?
这里面有个隐含条件:如果A→B,那么A在1数组出现的次数和B在2数组中出现的次数一定是一样的!
或者说,如果A出现的频率是30%,那么B也是30%。
即二者的地位是相同的。
所以,通过sort将counts1和counts2排序,并相互比较;如果二者一模一样,那就可以直接在对应字母间建立映射关系;否则,一定没法对应。

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<algorithm>
using namespace std;
const int maxl=105;
const int maxalpa=30;
char sup[maxl];
char sub[maxl];
int counts1[maxalpa],counts2[maxalpa];
int l;

int main()
{
    while(scanf("%s%s",sup,sub)!=EOF)
    {
        memset(counts1,0,sizeof(counts1));
        memset(counts2,0,sizeof(counts2));

        l=strlen(sup);
        for(int i=0;i<l;i++)
        {
            counts1[sup[i]-‘A‘]++;
            counts2[sub[i]-‘A‘]++;
        }
        sort(counts1,counts1+26);
        sort(counts2,counts2+26);
        if(!memcmp(counts1,counts2,sizeof(counts1)))
        printf("YES\n");
        else
        printf("NO\n");

        memset(sup,0,sizeof(sup));
        memset(sub,0,sizeof(sub));
    }
    return 0;
}   
时间: 2024-12-29 11:45:41

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