; LLVM IR from DionysiosB/CodeForces :: 0300-0399 (384B-Multitasking)

; 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"

@.str = external hidden unnamed_addr constant [12 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  %4 = alloca i64, align 8
  %5 = alloca i64, align 8
  %6 = alloca i32, align 4
  %7 = alloca i64, align 8
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 8, ptr %2) #3
  store i64 0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr %4) #3
  store i64 0, ptr %4, align 8, !tbaa !5
  %8 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef %2, ptr noundef %3, ptr noundef %4)
  %9 = load i64, ptr %3, align 8, !tbaa !5
  %10 = load i64, ptr %3, align 8, !tbaa !5
  %11 = sub nsw i64 %10, 1
  %12 = mul nsw i64 %9, %11
  %13 = sdiv i64 %12, 2
  %14 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %13)
  call void @llvm.lifetime.start.p0(i64 8, ptr %5) #3
  store i64 1, ptr %5, align 8, !tbaa !5
  br label %15

15:                                               ; preds = %44, %0
  %16 = load i64, ptr %5, align 8, !tbaa !5
  %17 = load i64, ptr %3, align 8, !tbaa !5
  %18 = icmp slt i64 %16, %17
  br i1 %18, label %20, label %19

19:                                               ; preds = %15
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %5) #3
  br label %47

20:                                               ; preds = %15
  call void @llvm.lifetime.start.p0(i64 8, ptr %7) #3
  %21 = load i64, ptr %5, align 8, !tbaa !5
  %22 = add nsw i64 %21, 1
  store i64 %22, ptr %7, align 8, !tbaa !5
  br label %23

23:                                               ; preds = %40, %20
  %24 = load i64, ptr %7, align 8, !tbaa !5
  %25 = load i64, ptr %3, align 8, !tbaa !5
  %26 = icmp sle i64 %24, %25
  br i1 %26, label %28, label %27

27:                                               ; preds = %23
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %7) #3
  br label %43

28:                                               ; preds = %23
  %29 = load i64, ptr %4, align 8, !tbaa !5
  %30 = icmp ne i64 %29, 0
  br i1 %30, label %35, label %31

31:                                               ; preds = %28
  %32 = load i64, ptr %5, align 8, !tbaa !5
  %33 = load i64, ptr %7, align 8, !tbaa !5
  %34 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i64 noundef %32, i64 noundef %33)
  br label %39

35:                                               ; preds = %28
  %36 = load i64, ptr %7, align 8, !tbaa !5
  %37 = load i64, ptr %5, align 8, !tbaa !5
  %38 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i64 noundef %36, i64 noundef %37)
  br label %39

39:                                               ; preds = %35, %31
  br label %40

40:                                               ; preds = %39
  %41 = load i64, ptr %7, align 8, !tbaa !5
  %42 = add nsw i64 %41, 1
  store i64 %42, ptr %7, align 8, !tbaa !5
  br label %23, !llvm.loop !9

43:                                               ; preds = %27
  br label %44

44:                                               ; preds = %43
  %45 = load i64, ptr %5, align 8, !tbaa !5
  %46 = add nsw i64 %45, 1
  store i64 %46, ptr %5, align 8, !tbaa !5
  br label %15, !llvm.loop !11

47:                                               ; preds = %19
  store i32 0, ptr %1, align 4
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %4) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr %2) #3
  %48 = load i32, ptr %1, align 4
  ret i32 %48
}

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

declare i32 @__isoc99_scanf(ptr noundef, ...) #2

declare i32 @printf(ptr noundef, ...) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { "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 #3 = { nounwind }

!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", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


; 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"

@.str = external hidden unnamed_addr constant [12 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i64, align 8
  %2 = alloca i64, align 8
  %3 = alloca i64, align 8
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %1) #3
  store i64 0, ptr %1, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %2) #3
  store i64 0, ptr %2, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %3) #3
  store i64 0, ptr %3, align 8, !tbaa !5
  %4 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull %1, ptr noundef nonnull %2, ptr noundef nonnull %3)
  %5 = load i64, ptr %2, align 8, !tbaa !5
  %6 = add nsw i64 %5, -1
  %7 = mul nsw i64 %6, %5
  %8 = sdiv i64 %7, 2
  %9 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %8)
  %10 = load i64, ptr %2, align 8, !tbaa !5
  %11 = icmp sgt i64 %10, 1
  br i1 %11, label %.lr.ph15, label %._crit_edge

.loopexit:                                        ; preds = %21, %.lr.ph15
  %12 = phi i64 [ %14, %.lr.ph15 ], [ %23, %21 ]
  %13 = icmp slt i64 %15, %12
  br i1 %13, label %.lr.ph15, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.loopexit, %0
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %3) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %2) #3
  call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %1) #3
  ret i32 0

.lr.ph15:                                         ; preds = %0, %.loopexit
  %14 = phi i64 [ %12, %.loopexit ], [ %10, %0 ]
  %.01014 = phi i64 [ %15, %.loopexit ], [ 1, %0 ]
  %15 = add nuw nsw i64 %.01014, 1
  %.not12.not = icmp slt i64 %.01014, %14
  br i1 %.not12.not, label %.lr.ph, label %.loopexit

.lr.ph:                                           ; preds = %.lr.ph15, %21
  %.013 = phi i64 [ %22, %21 ], [ %15, %.lr.ph15 ]
  %16 = load i64, ptr %3, align 8, !tbaa !5
  %.not11 = icmp eq i64 %16, 0
  br i1 %.not11, label %17, label %19

17:                                               ; preds = %.lr.ph
  %18 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i64 noundef %.01014, i64 noundef %.013)
  br label %21

19:                                               ; preds = %.lr.ph
  %20 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i64 noundef %.013, i64 noundef %.01014)
  br label %21

21:                                               ; preds = %17, %19
  %22 = add nuw nsw i64 %.013, 1
  %23 = load i64, ptr %2, align 8, !tbaa !5
  %.not.not = icmp slt i64 %.013, %23
  br i1 %.not.not, label %.lr.ph, label %.loopexit, !llvm.loop !11
}

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #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 = { mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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" }
attributes #3 = { nounwind }

!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", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"llvm.loop.mustprogress"}
!11 = distinct !{!11, !10}


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