代码

#include<bits/stdc++.h>
using namespace std;
string k,m;
int u,lenm,lenk,i;
int main(){
    cin>>k>>m;
    lenm=m.length();
    lenk=k.length();
    for(i=0;i<lenm;i++){
        u=i%lenk;
        if(k[u]-'a'<26)
            m[i]=m[i]+k[u]-'a';
        if(k[u]-'a'>26)
            m[i]=m[i]+k[u]-'A';
        }
    }
    cout<<m;
    return 0;
}

错误

/tmp/tmp6lx95q5w/src:17:5: 错误：‘cout’ does not name a type; did you mean ‘cosl’?
 cout<<m;
 ^~~~
 cosl
/tmp/tmp6lx95q5w/src:18:5: 错误：expected unqualified-id before ‘return’
 return 0;
 ^~~~~~
/tmp/tmp6lx95q5w/src:19:1: 错误：expected declaration before ‘}’ token
 }
^