ZOJ1006 Do the Untwist

Posted 2021-03-09 zhanglichen

简单模拟~

#include<bits/stdc++.h>
using namespace std;
const int maxn=1e6+14;
int a[maxn];
unordered_map<char,int> pos;
string s="_abcdefghijklmnopqrstuvwxyz.";
int len;
char ch[maxn];
int main () {
    for (int i=0;i<28;i++)pos[s[i]]=i;
    int n;
    while (scanf("%d",&n)&&n) {
        scanf("%s",ch);
        len=strlen(ch);
        for (int i=0;i<len;i++) a[n*i%len]=(pos[ch[i]]+i)%28;
        for (int i=0;i<len;i++) printf ("%c",s[a[i]]);
        printf ("
");
    }
    return 0;
}