#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*/ printf(char *, ...);
int randomSelect(int *, int /*<<< orphan*/, int, int);
int /*<<< orphan*/ scanf(char *, int *);
int main() {
  int i, n, k, num;
  n = 0;
  printf("Please input the array numbers:");
  scanf("%d", &n);
  int A[n];
  printf("Please input %d numbers:", n);
  for (i = 0; i < n; i++) {
    scanf("%d", &A[i]);
  }
  printf("Please input the Kth(must 1<=k<=%d) :", n);
  scanf("%d", &k);
  num = randomSelect(A, 0, n - 1, k);
  printf("%d\n", num);
  return 0;
}


x86 assembly (clang, -O0):
<main>:
push   %rbp
mov    %rsp,%rbp
sub    $0x30,%rsp
movl   $0x0,-0x4(%rbp)
movl   $0x0,-0xc(%rbp)
lea    0xeb3(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xec5(%rip),%rdi
lea    -0xc(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0xc(%rbp),%eax
mov    %rsp,%rcx
mov    %rcx,-0x20(%rbp)
lea    0xf(,%rax,4),%rdx
and    $0xfffffffffffffff0,%rdx
mov    %rsp,%rcx
sub    %rdx,%rcx
mov    %rcx,-0x30(%rbp)
mov    %rcx,%rsp
mov    %rax,-0x28(%rbp)
mov    -0xc(%rbp),%esi
lea    0xe8e(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x8(%rbp)
mov    -0x8(%rbp),%eax
cmp    -0xc(%rbp),%eax
jge    11d8 <main+0xa8>
mov    -0x30(%rbp),%rsi
movslq -0x8(%rbp),%rax
shl    $0x2,%rax
add    %rax,%rsi
lea    0xe5b(%rip),%rdi
call   1040 <scanf@plt>
mov    -0x8(%rbp),%eax
add    $0x1,%eax
mov    %eax,-0x8(%rbp)
jmp    11a3 <main+0x73>
mov    -0xc(%rbp),%esi
lea    0xe5a(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
lea    0xe30(%rip),%rdi
lea    -0x10(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x30(%rbp),%rdi
mov    -0xc(%rbp),%edx
sub    $0x1,%edx
mov    -0x10(%rbp),%ecx
xor    %esi,%esi
call   1050 <randomSelect@plt>
mov    %eax,-0x14(%rbp)
mov    -0x14(%rbp),%esi
lea    0xe48(%rip),%rdi
mov    $0x0,%al
call   1030 <printf@plt>
movl   $0x0,-0x4(%rbp)
mov    -0x20(%rbp),%rax
mov    %rax,%rsp
mov    -0x4(%rbp),%eax
mov    %rbp,%rsp
pop    %rbp
ret

x86 assembly (clang, -O2):
<main>:
push   %rbp
mov    %rsp,%rbp
push   %r15
push   %r14
push   %r13
push   %r12
push   %rbx
push   %rax
movl   $0x0,-0x2c(%rbp)
lea    0xeb4(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xec6(%rip),%rdi
lea    -0x2c(%rbp),%rsi
call   1040 <scanf@plt>
mov    %rsp,%r12
mov    -0x2c(%rbp),%eax
mov    %rsp,%r14
lea    0xf(,%rax,4),%rax
and    $0xfffffffffffffff0,%rax
sub    %rax,%r14
mov    %r14,%rsp
mov    -0x2c(%rbp),%esi
lea    0xe9b(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
mov    -0x2c(%rbp),%esi
test   %esi,%esi
jle    11cc <main+0x9c>
xor    %r13d,%r13d
lea    0xe80(%rip),%r15
mov    %r14,%rbx
cs nopw 0x0(%rax,%rax,1)
nopl   (%rax)
mov    %r15,%rdi
mov    %rbx,%rsi
call   1040 <scanf@plt>
add    $0x1,%r13
movslq -0x2c(%rbp),%rsi
add    $0x4,%rbx
cmp    %rsi,%r13
jl     11b0 <main+0x80>
lea    0xe69(%rip),%rdi
xor    %eax,%eax
call   1030 <printf@plt>
lea    0xe3f(%rip),%rdi
lea    -0x30(%rbp),%rsi
call   1040 <scanf@plt>
mov    -0x2c(%rbp),%edx
add    $0xffffffff,%edx
mov    -0x30(%rbp),%ecx
mov    %r14,%rdi
xor    %esi,%esi
call   1050 <randomSelect@plt>
lea    0xe5e(%rip),%rdi
mov    %eax,%esi
xor    %eax,%eax
call   1030 <printf@plt>
mov    %r12,%rsp
xor    %eax,%eax
lea    -0x28(%rbp),%rsp
pop    %rbx
pop    %r12
pop    %r13
pop    %r14
pop    %r15
pop    %rbp
ret

LLVM IR (-O0):
@.str = [32 x i8] c"Please input the array numbers:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [25 x i8] c"Please input %d numbers:\00"
@.str.3 = [38 x i8] c"Please input the Kth(must 1<=k<=%d) :\00"
@.str.4 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = alloca i32
%4 = alloca i32
%5 = alloca i32
%6 = alloca i8*
%7 = alloca i64
store i32 0, i32* %1
store i32 0, i32* %3
%8 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([32 x i8], [32 x i8]* @.str, i64 0, i64 0))
%9 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %3)
%10 = load i32, i32* %3
%11 = zext i32 %10 to i64
%12 = call i8* @llvm.stacksave()
store i8* %12, i8** %6
%13 = alloca i32, i64 %11
store i64 %11, i64* %7
%14 = load i32, i32* %3
%15 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0), i32 %14)
store i32 0, i32* %2
br label %16
16: ; preds = %25, %0
%17 = load i32, i32* %2
%18 = load i32, i32* %3
%19 = icmp slt i32 %17, %18
br i1 %19, label %20, label %28
20: ; preds = %16
%21 = load i32, i32* %2
%22 = sext i32 %21 to i64
%23 = getelementptr inbounds i32, i32* %13, i64 %22
%24 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %23)
br label %25
25: ; preds = %20
%26 = load i32, i32* %2
%27 = add nsw i32 %26, 1
store i32 %27, i32* %2
br label %16
28: ; preds = %16
%29 = load i32, i32* %3
%30 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([38 x i8], [38 x i8]* @.str.3, i64 0, i64 0), i32 %29)
%31 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %4)
%32 = load i32, i32* %3
%33 = sub nsw i32 %32, 1
%34 = load i32, i32* %4
%35 = call i32 @randomSelect(i32* %13, i32 0, i32 %33, i32 %34)
store i32 %35, i32* %5
%36 = load i32, i32* %5
%37 = call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 %36)
store i32 0, i32* %1
%38 = load i8*, i8** %6
%39 = load i32, i32* %1
ret i32 %39
}

LLVM IR (-O2):
@.str = [32 x i8] c"Please input the array numbers:\00"
@.str.1 = [3 x i8] c"%d\00"
@.str.2 = [25 x i8] c"Please input %d numbers:\00"
@.str.3 = [38 x i8] c"Please input the Kth(must 1<=k<=%d) :\00"
@.str.4 = [4 x i8] c"%d\0A\00"
define i32 @main() {
%1 = alloca i32
%2 = alloca i32
%3 = bitcast i32* %1 to i8*
%4 = bitcast i32* %2 to i8*
store i32 0, i32* %1
%5 = tail call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([32 x i8], [32 x i8]* @.str, i64 0, i64 0))
%6 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %1)
%7 = load i32, i32* %1
%8 = zext i32 %7 to i64
%9 = call i8* @llvm.stacksave()
%10 = alloca i32, i64 %8
%11 = load i32, i32* %1
%12 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([25 x i8], [25 x i8]* @.str.2, i64 0, i64 0), i32 %11)
%13 = load i32, i32* %1
%14 = icmp sgt i32 %13, 0
br i1 %14, label %15, label %23
15: ; preds = %0, %15
%16 = phi i64 [ %19, %15 ], [ 0, %0 ]
%17 = getelementptr inbounds i32, i32* %10, i64 %16
%18 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %17)
%19 = add nuw nsw i64 %16, 1
%20 = load i32, i32* %1
%21 = sext i32 %20 to i64
%22 = icmp slt i64 %19, %21
br i1 %22, label %15, label %23
23: ; preds = %15, %0
%24 = phi i32 [ %13, %0 ], [ %20, %15 ]
%25 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([38 x i8], [38 x i8]* @.str.3, i64 0, i64 0), i32 %24)
%26 = call i32 @scanf(i8* getelementptr inbounds ([3 x i8], [3 x i8]* @.str.1, i64 0, i64 0), i32* %2)
%27 = load i32, i32* %1
%28 = add nsw i32 %27, -1
%29 = load i32, i32* %2
%30 = call i32 @randomSelect(i32* %10, i32 0, i32 %28, i32 %29)
%31 = call i32 (i8*, ...) @printf(i8* dereferenceable(1) getelementptr inbounds ([4 x i8], [4 x i8]* @.str.4, i64 0, i64 0), i32 %30)
ret i32 0
}