#include <bits/stdc++.h> using namespace std; string l; int main(){ getline(cin,l); for(int I=0;I<l.size();I++){ if(s[i]>='A' && s[i]<='Z'){ if(s[i]-5>='A'){ l[i]-=5; }else{ l[i]=l[i]-5+26; } } } cout<<l; return 0; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
    string s;
    getline(cin,s);
    for(char &c : s)
    {
        if(c >= 'A' && c <= 'Z')
        {
            c=(26+c-'A'-5)%26+'A';
        }
    }
    cout << s;
    return 0;
}

加油

#include<bits/stdc++.h> using namespace std; int main(){ string n; getline(cin,n); for(int i=0;i<n.size();i++){ if(n[i]>='A' and n[i]<='Z'){ if(n[i]<='E' and n[i]>='A'){ n[i]=n[i]+21; } else n[i]-=5; } } cout<<n; return 0; }

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