luoguP1079 Vigenère 密码 题解(NOIP2012)

P1079 Vigenère 密码 题目

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<iomanip>
#include<algorithm>
#include<ctime>
#include<queue>
#include<stack>
#define rg register
#define lst long long
#define N 1050
using namespace std;

int lmy,lmw,now=-;
char my[N],mw[N],ans[N];

inline int read()
{
    rg int s=,m=;rg char ch=getchar();
    while(ch!='-'&&(ch<''||ch>''))ch=getchar();
    if(ch=='-')m=-,ch=getchar();
    while(ch>=''&&ch<='')s=(s<<)+(s<<)+ch-'',ch=getchar();
    return s*m;
}

int main()
{
    cin>>my>>mw;
//    puts(my),puts(mw);
    lmy=strlen(my),lmw=strlen(mw);
//    cout<<lmy<<" "<<lmw<<endl;
    for(rg int i=;i<lmy;++i)
        if(my[i]>='a'&&my[i]<='z')my[i]-=;
//    puts(my);
    for(rg int i=;i<lmw;++i)
    {
        now++;
        if(now==lmy)now=;
        ans[i]=mw[i]-my[now]+'A';
        if(ans[i]<'a'&&(mw[i]>='a'&&mw[i]<='z'))ans[i]=mw[i]-my[now]+'A'+;
        if(ans[i]<'A'&&(mw[i]>='A'&&mw[i]<='Z'))ans[i]=mw[i]-my[now]+'A'+;
    }
    puts(ans);
    return ;
}