Vigenère 密码

这个东西的源码： ```html 可登录，可提交，挺好使 ``` 注：动态题面查看测试中，有问题反馈哦。

标签：
(fbox{模拟})
(fbox{字符串处理})

代码：

#include <iostream>
#include <cstring>
#include <string>
#include <cstdlib>
using namespace std;
char s[28][28] = {
{"abcdefghijklmnopqrstuvwxyz"},
{"bcdefghijklmnopqrstuvwxyza"},
{"cdefghijklmnopqrstuvwxyzab"},
{"defghijklmnopqrstuvwxyzabc"},
{"efghijklmnopqrstuvwxyzabcd"},
{"fghijklmnopqrstuvwxyzabcde"},
{"ghijklmnopqrstuvwxyzabcdef"},
{"hijklmnopqrstuvwxyzabcdefg"},
{"ijklmnopqrstuvwxyzabcdefgh"},
{"jklmnopqrstuvwxyzabcdefghi"},
{"klmnopqrstuvwxyzabcdefghij"},
{"lmnopqrstuvwxyzabcdefghijk"},
{"mnopqrstuvwxyzabcdefghijkl"},
{"nopqrstuvwxyzabcdefghijklm"},
{"opqrstuvwxyzabcdefghijklmn"},
{"pqrstuvwxyzabcdefghijklmno"},
{"qrstuvwxyzabcdefghijklmnop"},
{"rstuvwxyzabcdefghijklmnopq"},
{"stuvwxyzabcdefghijklmnopqr"},
{"tuvwxyzabcdefghijklmnopqrs"},
{"uvwxyzabcdefghijklmnopqrst"},
{"vwxyzabcdefghijklmnopqrstu"},
{"wxyzabcdefghijklmnopqrstuv"},
{"xyzabcdefghijklmnopqrstuvw"},
{"yzabcdefghijklmnopqrstuvwx"},
{"zabcdefghijklmnopqrstuvwxy"},
};

signed main() {
	string key;
	string v1;
	char v2[1000101];
	int v2len = 0;
	memset(v2,' ',sizeof(v2));
	cin>>key;
	cin>>v1;
	if(v1.length()>key.length()) {
		
		int i = 0;
		int j = 0;
		int k = 0;
		while(j<v1.length()) {
			//´¦Àí´óд 
			if(v1[j]>='A'&&v1[j]<='Z') {
				if(key[i]>='A'&&key[i]<='Z') {
					key[i] = key[i]-'A'+'a';
				}
				for(k = 0;k<26;++k) {
					if(s[k][key[i]-'a']==v1[j]-'A'+'a') {
						v2[v2len] = k+'A';
						v2len++;
					}
				}
			}
			//´¦ÀíСд 
			if(v1[j]>='a'&&v1[j]<='z') {
				if(key[i]>='A'&&key[i]<='Z') {
					key[i] = key[i]-'A'+'a';
				}
				for(k = 0;k<26;++k) {
					if(s[k][key[i]-'a']==v1[j]) {
						v2[v2len] = k+'a';
						v2len++;
					}
				}
			}
			i++;
			j++;
			if(i==key.length()) {
				i = 0;
			}
		}
	} else {
		int i = 0;
		int j = 0;
		int k = 0;
		while(j<v1.length()) {
			//´¦Àí´óд 
			if(v1[j]>='A'&&v1[j]<='Z') {
				if(key[i]>='A'&&key[i]<='Z') {
					key[i] = key[i]-'A'+'a';
				}
				for(k = 0;k<26;++k) {
					if(s[k][key[i]-'a']==v1[j]-'A'+'a') {
						v2[v2len] = k+'A';
						v2len++;
					}
				}
			}
			//´¦ÀíСд 
			if(v1[j]>='a'&&v1[j]<='z') {
				if(key[i]>='A'&&key[i]<='Z') {
					key[i] = key[i]-'A'+'a';
				}
				for(k = 0;k<26;++k) {
					if(s[k][key[i]-'a']==v1[j]) {
						v2[v2len] = k+'a';
						v2len++;
					}
				}
			}
			i++;
			j++;
		}
	}
//	cout<<v2len<<endl;
	for(int i = 0;i<v2len;++i) {
		cout<<v2[i];
	}
}