; LLVM IR from tangjz/acm-icpc :: buaa/oj3rd (1101)

; Unoptimized IR (clang -disable-llvm-passes):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@cnt = external dso_local global i32, align 4
@sum = external dso_local global i64, align 8
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %2

2:                                                ; preds = %22, %0
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  %4 = icmp eq i32 %3, 1
  br i1 %4, label %5, label %31

5:                                                ; preds = %2
  store i64 0, ptr @sum, align 8, !tbaa !5
  store i32 0, ptr @cnt, align 4, !tbaa !9
  br label %6

6:                                                ; preds = %17, %5
  %7 = load i32, ptr @n, align 4, !tbaa !9
  %8 = add nsw i32 %7, -1
  store i32 %8, ptr @n, align 4, !tbaa !9
  %9 = icmp ne i32 %7, 0
  br i1 %9, label %10, label %22

10:                                               ; preds = %6
  %11 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @x)
  %12 = load i32, ptr @cnt, align 4, !tbaa !9
  %13 = load i32, ptr @x, align 4, !tbaa !9
  %14 = icmp slt i32 %12, %13
  br i1 %14, label %15, label %17

15:                                               ; preds = %10
  %16 = load i32, ptr @x, align 4, !tbaa !9
  store i32 %16, ptr @cnt, align 4, !tbaa !9
  br label %17

17:                                               ; preds = %15, %10
  %18 = load i32, ptr @x, align 4, !tbaa !9
  %19 = sext i32 %18 to i64
  %20 = load i64, ptr @sum, align 8, !tbaa !5
  %21 = add nsw i64 %20, %19
  store i64 %21, ptr @sum, align 8, !tbaa !5
  br label %6, !llvm.loop !11

22:                                               ; preds = %6
  %23 = load i32, ptr @cnt, align 4, !tbaa !9
  %24 = sext i32 %23 to i64
  %25 = load i64, ptr @sum, align 8, !tbaa !5
  %26 = sdiv i64 %25, 2
  %27 = icmp sle i64 %24, %26
  %28 = zext i1 %27 to i64
  %29 = select i1 %27, ptr @.str.1, ptr @.str.2
  %30 = call i32 @puts(ptr noundef %29)
  br label %2, !llvm.loop !13

31:                                               ; preds = %2
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

declare i32 @puts(ptr noundef) #1

attributes #0 = { mustprogress norecurse uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Optimized IR (opt -passes='default<O3>'):
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"

@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@cnt = external dso_local local_unnamed_addr global i32, align 4
@sum = external dso_local local_unnamed_addr global i64, align 8
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [4 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [3 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %2 = icmp eq i32 %1, 1
  br i1 %2, label %.lr.ph4, label %._crit_edge5

.lr.ph4:                                          ; preds = %0, %._crit_edge
  store i64 0, ptr @sum, align 8, !tbaa !5
  store i32 0, ptr @cnt, align 4, !tbaa !9
  %3 = load i32, ptr @n, align 4, !tbaa !9
  %4 = add nsw i32 %3, -1
  store i32 %4, ptr @n, align 4, !tbaa !9
  %.not2 = icmp eq i32 %3, 0
  br i1 %.not2, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %.lr.ph4, %10
  %5 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @x)
  %6 = load i32, ptr @cnt, align 4, !tbaa !9
  %7 = load i32, ptr @x, align 4, !tbaa !9
  %8 = icmp slt i32 %6, %7
  br i1 %8, label %9, label %10

9:                                                ; preds = %.lr.ph
  store i32 %7, ptr @cnt, align 4, !tbaa !9
  br label %10

10:                                               ; preds = %9, %.lr.ph
  %11 = phi i32 [ %7, %9 ], [ %6, %.lr.ph ]
  %12 = sext i32 %7 to i64
  %13 = load i64, ptr @sum, align 8, !tbaa !5
  %14 = add nsw i64 %13, %12
  store i64 %14, ptr @sum, align 8, !tbaa !5
  %15 = load i32, ptr @n, align 4, !tbaa !9
  %16 = add nsw i32 %15, -1
  store i32 %16, ptr @n, align 4, !tbaa !9
  %.not = icmp eq i32 %15, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %10, %.lr.ph4
  %17 = phi i64 [ 0, %.lr.ph4 ], [ %14, %10 ]
  %18 = phi i32 [ 0, %.lr.ph4 ], [ %11, %10 ]
  %19 = sext i32 %18 to i64
  %20 = sdiv i64 %17, 2
  %.not1 = icmp slt i64 %20, %19
  %21 = select i1 %.not1, ptr @.str.2, ptr @.str.1
  %22 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %21)
  %23 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %24 = icmp eq i32 %23, 1
  br i1 %24, label %.lr.ph4, label %._crit_edge5, !llvm.loop !13

._crit_edge5:                                     ; preds = %._crit_edge, %0
  ret i32 0
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #1

attributes #0 = { mustprogress nofree norecurse nounwind uwtable "min-legal-vector-width"="0" "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }
attributes #1 = { nofree nounwind "no-trapping-math"="true" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+cmov,+cx8,+fxsr,+mmx,+sse,+sse2,+x87" "tune-cpu"="generic" }

!llvm.module.flags = !{!0, !1, !2, !3}
!llvm.ident = !{!4}

!0 = !{i32 1, !"wchar_size", i32 4}
!1 = !{i32 8, !"PIC Level", i32 2}
!2 = !{i32 7, !"PIE Level", i32 2}
!3 = !{i32 7, !"uwtable", i32 2}
!4 = !{!"clang version 19.1.0 (git@github.com:llvm/llvm-project.git a4bf6cd7cfb1a1421ba92bca9d017b49936c55e4)"}
!5 = !{!6, !6, i64 0}
!6 = !{!"long long", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = !{!10, !10, i64 0}
!10 = !{!"int", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}
!13 = distinct !{!13, !12}


; Effective O3 passes: EarlyCSEPass,GVNPass,GlobalOptPass,InferFunctionAttrsPass,InstCombinePass,InstSimplifyPass,JumpThreadingPass,LCSSAPass,LoopRotatePass,LoopSimplifyPass,LoopUnrollPass,PostOrderFunctionAttrsPass,SROAPass,SimplifyCFGPass,TailCallElimPass