#define NULL ((void *)0)
typedef unsigned long size_t; // Customize by platform.
typedef long intptr_t;
typedef unsigned long uintptr_t;
typedef long scalar_t__; // Either arithmetic or pointer type.
/* By default, we understand bool (as a convenience). */
typedef int bool;
#define false 0
#define true 1

/* Forward declarations */

/* Type definitions */

/* Variables and functions */
int /*<<< orphan*/ scanf(char *, ...);
int /*<<< orphan*/ string_rev(char *, int);
int main() {
  char ch[100];
  int n;
  scanf("%d\n", &n);
  for (int i = 0; i <= n - 2; i++)
    scanf("%c", &ch[i]);
  string_rev(ch, n);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x80,%rsp
movl   $0x0,-0x4(%rbp)
lea    0xec7(%rip),%rdi
lea    -0x74(%rbp),%rsi
mov    $0x0,%al
call   1040 <scanf@plt>
movl   $0x0,-0x78(%rbp)
mov    -0x78(%rbp),%eax
mov    -0x74(%rbp),%ecx
sub    $0x2,%ecx
cmp    %ecx,%eax
jg     1183 <main+0x63>
movslq -0x78(%rbp),%rax
lea    -0x70(%rbp),%rsi
add    %rax,%rsi
lea    0xe96(%rip),%rdi
mov    $0x0,%al
call   1040 <scanf@plt>
mov    -0x78(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x78(%rbp)
jmp    114b <main+0x2b>
lea    -0x70(%rbp),%rdi
mov    -0x74(%rbp),%esi
call   1030 <string_rev@plt>
xor    %eax,%eax
add    $0x80,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %r14
push   %rbx
sub    $0x78,%rsp
lea    0xed2(%rip),%rdi
lea    0xc(%rsp),%rsi
xor    %eax,%eax
call   1040 <scanf@plt>
mov    0xc(%rsp),%esi
cmp    $0x2,%esi
jl     1184 <main+0x64>
mov    $0xffffffffffffffff,%rbx
lea    0xeb3(%rip),%r14
cs nopw 0x0(%rax,%rax,1)
nopl   0x0(%rax,%rax,1)
lea    (%rsp,%rbx,1),%rsi
add    $0x11,%rsi
mov    %r14,%rdi
xor    %eax,%eax
call   1040 <scanf@plt>
movslq 0xc(%rsp),%rsi
lea    -0x2(%rsi),%rax
add    $0x1,%rbx
cmp    %rax,%rbx
jl     1160 <main+0x40>
lea    0x10(%rsp),%rdi
call   1030 <string_rev@plt>
xor    %eax,%eax
add    $0x78,%rsp
pop    %rbx
pop    %r14
ret

LLVM IR (-O0):
@.str = [4 x i8] c"%d\0A\00"
@.str.1 = [3 x i8] c"%c\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca [100 x i8]
%3 = alloca i32
%4 = alloca i32
store i32 0, i32* %1
%5 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32* %3)
store i32 0, i32* %4
br label %6
6: ; preds = %16, %0
%7 = load i32, i32* %4
%8 = load i32, i32* %3
%9 = sub nsw i32 %8, 2
%10 = icmp sle i32 %7, %9
br i1 %10, label %11, label %19
11: ; preds = %6
%12 = load i32, i32* %4
%13 = sext i32 %12 to i64
%14 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 %13
%15 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %14)
br label %16
16: ; preds = %11
%17 = load i32, i32* %4
%18 = add nsw i32 %17, 1
store i32 %18, i32* %4
br label %6
19: ; preds = %6
%20 = getelementptr inbounds [100 x i8], [100 x i8]* %2, i64 0, i64 0
%21 = load i32, i32* %3
%22 = call i32 @string_rev(i8* %20, i32 %21)
ret i32 0
}

LLVM IR (-O2):
@.str = [4 x i8] c"%d\0A\00"
@.str.1 = [3 x i8] c"%c\00"
define i32 @main() {
%1 = alloca [100 x i8]
%2 = alloca i32
%3 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 0
%4 = bitcast i32* %2 to i8*
%5 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32* %2)
%6 = load i32, i32* %2
%7 = icmp slt i32 %6, 2
br i1 %7, label %8, label %11
8: ; preds = %11, %0
%9 = phi i32 [ %6, %0 ], [ %16, %11 ]
%10 = call i32 @string_rev(i8* %3, i32 %9)
ret i32 0
11: ; preds = %0, %11
%12 = phi i64 [ %15, %11 ], [ 0, %0 ]
%13 = getelementptr inbounds [100 x i8], [100 x i8]* %1, i64 0, i64 %12
%14 = call i32 (i8*, ...) @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i8* %13)
%15 = add nuw nsw i64 %12, 1
%16 = load i32, i32* %2
%17 = add nsw i32 %16, -2
%18 = sext i32 %17 to i64
%19 = icmp slt i64 %12, %18
br i1 %19, label %11, label %8
}