提交者：@

首先我们读题后会发现这个其实就是凯撒密码

但是有一点点细节：

请注意：毒瘤出题人并不会放过你，而是反手就来了一句话

可能会有小部分数据含有非大写字符，请照常输出这些字符。 但是保证全部都是ASKII字符，而非Unicode字符（要不然你TM得用python了）

而且题目并没有说偏移量不能超过26。所以需要注意mod26

// P3600 标准程序 
#include <iostream>
#include <string>
using namespace std;
int n;//偏移量
string h,a;//输入，输出的字符串
char alpa[60];
int main(){
	cin >> n;
	cin >> h;
	char al = 'A'-1;//目前的字母
	while (n>25) n%=26;//防止超过26，不过这里的while可以换成if
	for (int i = 1;i<=26;i++){
		al++;
		alpa[i]=al;
	}
    //生成对应的加密字符
	al = 'A'-1;
	for (int i = 27;i<=51;i++){
		al++;
		alpa[i]=al;
	}
    //这里是防止越界，由于前面mod26过，所以这里<=51就行
	for (int i = 0;i<h.size();i++){
		
		if (h[i]>='A'&&'Z'>=h[i])a+=alpa[h[i]-'A'+1+n];
		else a+=h[i];
	}
    //生成
	cout << a;
}

抄题解的人将会获得作弊者TAG

当然，为了各位学习汇编的人学习快乐，这里也把汇编的放一下：

n:
        .zero   4
h[abi:cxx11]:
        .zero   32
a[abi:cxx11]:
        .zero   32
alpa:
        .zero   60
main:
        push    rbp
        mov     rbp, rsp
        push    rbx
        sub     rsp, 24
        mov     esi, OFFSET FLAT:n
        mov     edi, OFFSET FLAT:_ZSt3cin
        call    std::basic_istream<char, std::char_traits<char> >::operator>>(int&)
        mov     esi, OFFSET FLAT:h[abi:cxx11]
        mov     edi, OFFSET FLAT:_ZSt3cin
        call    std::basic_istream<char, std::char_traits<char> >& std::operator>><char, std::char_traits<char>, std::allocator<char> >(std::basic_istream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >&)
        mov     BYTE PTR [rbp-17], 64
        jmp     .L2
.L3:
        mov     edx, DWORD PTR n[rip]
        movsx   rax, edx
        imul    rax, rax, 1321528399
        shr     rax, 32
        sar     eax, 3
        mov     ecx, edx
        sar     ecx, 31
        sub     eax, ecx
        imul    ecx, eax, 26
        mov     eax, edx
        sub     eax, ecx
        mov     DWORD PTR n[rip], eax
.L2:
        mov     eax, DWORD PTR n[rip]
        cmp     eax, 25
        jg      .L3
        mov     DWORD PTR [rbp-24], 1
        jmp     .L4
.L5:
        movzx   eax, BYTE PTR [rbp-17]
        add     eax, 1
        mov     BYTE PTR [rbp-17], al
        mov     eax, DWORD PTR [rbp-24]
        cdqe
        movzx   edx, BYTE PTR [rbp-17]
        mov     BYTE PTR alpa[rax], dl
        add     DWORD PTR [rbp-24], 1
.L4:
        cmp     DWORD PTR [rbp-24], 26
        jle     .L5
        mov     BYTE PTR [rbp-17], 64
        mov     DWORD PTR [rbp-28], 27
        jmp     .L6
.L7:
        movzx   eax, BYTE PTR [rbp-17]
        add     eax, 1
        mov     BYTE PTR [rbp-17], al
        mov     eax, DWORD PTR [rbp-28]
        cdqe
        movzx   edx, BYTE PTR [rbp-17]
        mov     BYTE PTR alpa[rax], dl
        add     DWORD PTR [rbp-28], 1
.L6:
        cmp     DWORD PTR [rbp-28], 51
        jle     .L7
        mov     DWORD PTR [rbp-32], 0
        jmp     .L8
.L13:
        mov     eax, DWORD PTR [rbp-32]
        cdqe
        mov     rsi, rax
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long)
        movzx   eax, BYTE PTR [rax]
        cmp     al, 64
        jle     .L9
        mov     eax, DWORD PTR [rbp-32]
        cdqe
        mov     rsi, rax
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long)
        movzx   eax, BYTE PTR [rax]
        cmp     al, 90
        jg      .L9
        mov     eax, 1
        jmp     .L10
.L9:
        mov     eax, 0
.L10:
        test    al, al
        je      .L11
        mov     eax, DWORD PTR [rbp-32]
        cdqe
        mov     rsi, rax
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long)
        movzx   eax, BYTE PTR [rax]
        movsx   eax, al
        lea     edx, [rax-64]
        mov     eax, DWORD PTR n[rip]
        add     eax, edx
        cdqe
        movzx   eax, BYTE PTR alpa[rax]
        movsx   eax, al
        mov     esi, eax
        mov     edi, OFFSET FLAT:a[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator+=(char)
        jmp     .L12
.L11:
        mov     eax, DWORD PTR [rbp-32]
        cdqe
        mov     rsi, rax
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator[](unsigned long)
        movzx   eax, BYTE PTR [rax]
        movsx   eax, al
        mov     esi, eax
        mov     edi, OFFSET FLAT:a[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::operator+=(char)
.L12:
        add     DWORD PTR [rbp-32], 1
.L8:
        mov     eax, DWORD PTR [rbp-32]
        movsx   rbx, eax
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::size() const
        cmp     rbx, rax
        setb    al
        test    al, al
        jne     .L13
        mov     esi, OFFSET FLAT:a[abi:cxx11]
        mov     edi, OFFSET FLAT:_ZSt4cout
        call    std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
        mov     eax, 0
        mov     rbx, QWORD PTR [rbp-8]
        leave
        ret
__static_initialization_and_destruction_0(int, int):
        push    rbp
        mov     rbp, rsp
        sub     rsp, 16
        mov     DWORD PTR [rbp-4], edi
        mov     DWORD PTR [rbp-8], esi
        cmp     DWORD PTR [rbp-4], 1
        jne     .L17
        cmp     DWORD PTR [rbp-8], 65535
        jne     .L17
        mov     edi, OFFSET FLAT:_ZStL8__ioinit
        call    std::ios_base::Init::Init() [complete object constructor]
        mov     edx, OFFSET FLAT:__dso_handle
        mov     esi, OFFSET FLAT:_ZStL8__ioinit
        mov     edi, OFFSET FLAT:_ZNSt8ios_base4InitD1Ev
        call    __cxa_atexit
        mov     edi, OFFSET FLAT:h[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string() [complete object constructor]
        mov     edx, OFFSET FLAT:__dso_handle
        mov     esi, OFFSET FLAT:h[abi:cxx11]
        mov     edi, OFFSET FLAT:_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev
        call    __cxa_atexit
        mov     edi, OFFSET FLAT:a[abi:cxx11]
        call    std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string() [complete object constructor]
        mov     edx, OFFSET FLAT:__dso_handle
        mov     esi, OFFSET FLAT:a[abi:cxx11]
        mov     edi, OFFSET FLAT:_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEED1Ev
        call    __cxa_atexit
.L17:
        nop
        leave
        ret
_GLOBAL__sub_I_n:
        push    rbp
        mov     rbp, rsp
        mov     esi, 65535
        mov     edi, 1
        call    __static_initialization_and_destruction_0(int, int)
        pop     rbp
        ret