; LLVM IR from tangjz/acm-icpc :: codeforces/gym (101412I)

; 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
@m = external dso_local global i32, align 4
@a = external dso_local global [50001 x i32], align 16
@s = external dso_local global [50001 x i32], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5checki(i32 noundef) #0

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

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

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #2 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %6

6:                                                ; preds = %63, %0
  %7 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @m, ptr noundef @n)
  %8 = icmp eq i32 %7, 2
  br i1 %8, label %9, label %14

9:                                                ; preds = %6
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = load i32, ptr @m, align 4, !tbaa !5
  %12 = add nsw i32 %10, %11
  %13 = icmp ne i32 %12, 0
  br label %14

14:                                               ; preds = %9, %6
  %15 = phi i1 [ false, %6 ], [ %13, %9 ]
  br i1 %15, label %16, label %66

16:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %17

17:                                               ; preds = %40, %16
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = load i32, ptr @n, align 4, !tbaa !5
  %20 = icmp sle i32 %18, %19
  br i1 %20, label %22, label %21

21:                                               ; preds = %17
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %43

22:                                               ; preds = %17
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds i32, ptr @a, i64 %24
  %26 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef %25)
  %27 = load i32, ptr %2, align 4, !tbaa !5
  %28 = sub nsw i32 %27, 1
  %29 = sext i32 %28 to i64
  %30 = getelementptr inbounds [50001 x i32], ptr @s, i64 0, i64 %29
  %31 = load i32, ptr %30, align 4, !tbaa !5
  %32 = load i32, ptr %2, align 4, !tbaa !5
  %33 = sext i32 %32 to i64
  %34 = getelementptr inbounds [50001 x i32], ptr @a, i64 0, i64 %33
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = add nsw i32 %31, %35
  %37 = load i32, ptr %2, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds [50001 x i32], ptr @s, i64 0, i64 %38
  store i32 %36, ptr %39, align 4, !tbaa !5
  br label %40

40:                                               ; preds = %22
  %41 = load i32, ptr %2, align 4, !tbaa !5
  %42 = add nsw i32 %41, 1
  store i32 %42, ptr %2, align 4, !tbaa !5
  br label %17, !llvm.loop !9

43:                                               ; preds = %21
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 1, ptr %3, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #4
  %44 = load i32, ptr @m, align 4, !tbaa !5
  %45 = sub nsw i32 %44, 2
  store i32 %45, ptr %4, align 4, !tbaa !5
  br label %46

46:                                               ; preds = %62, %43
  %47 = load i32, ptr %3, align 4, !tbaa !5
  %48 = load i32, ptr %4, align 4, !tbaa !5
  %49 = icmp slt i32 %47, %48
  br i1 %49, label %50, label %63

50:                                               ; preds = %46
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  %51 = load i32, ptr %3, align 4, !tbaa !5
  %52 = load i32, ptr %4, align 4, !tbaa !5
  %53 = add nsw i32 %51, %52
  %54 = ashr i32 %53, 1
  store i32 %54, ptr %5, align 4, !tbaa !5
  %55 = load i32, ptr %5, align 4, !tbaa !5
  %56 = call noundef zeroext i1 @_Z5checki(i32 noundef %55)
  br i1 %56, label %57, label %59

57:                                               ; preds = %50
  %58 = load i32, ptr %5, align 4, !tbaa !5
  store i32 %58, ptr %4, align 4, !tbaa !5
  br label %62

59:                                               ; preds = %50
  %60 = load i32, ptr %5, align 4, !tbaa !5
  %61 = add nsw i32 %60, 1
  store i32 %61, ptr %3, align 4, !tbaa !5
  br label %62

62:                                               ; preds = %59, %57
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %46, !llvm.loop !11

63:                                               ; preds = %46
  %64 = load i32, ptr %3, align 4, !tbaa !5
  %65 = call i32 (ptr, ...) @printf(ptr noundef @.str.2, i32 noundef %64)
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  br label %6, !llvm.loop !12

66:                                               ; preds = %14
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #3

declare i32 @printf(ptr noundef, ...) #3

attributes #0 = { mustprogress 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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
attributes #2 = { 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 #3 = { "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 #4 = { 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 = !{!"int", !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}
!12 = distinct !{!12, !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"

@n = external dso_local global i32, align 4
@m = external dso_local global i32, align 4
@a = external dso_local global [50001 x i32], align 16
@s = external dso_local local_unnamed_addr global [50001 x i32], align 16
@.str = external hidden unnamed_addr constant [5 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [3 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [4 x i8], align 1

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_Z5checki(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #1 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @m, ptr noundef nonnull @n)
  %2 = icmp eq i32 %1, 2
  %3 = load i32, ptr @n, align 4
  %4 = load i32, ptr @m, align 4
  %5 = sub i32 0, %4
  %6 = icmp ne i32 %3, %5
  %7 = select i1 %2, i1 %6, i1 false
  br i1 %7, label %.preheader, label %._crit_edge24

.preheader:                                       ; preds = %0, %._crit_edge23
  %8 = phi i32 [ %32, %._crit_edge23 ], [ %4, %0 ]
  %9 = phi i32 [ %31, %._crit_edge23 ], [ %3, %0 ]
  %.not17 = icmp slt i32 %9, 1
  br i1 %.not17, label %._crit_edge, label %.lr.ph

._crit_edge.loopexit:                             ; preds = %.lr.ph
  %.pre = load i32, ptr @m, align 4, !tbaa !5
  br label %._crit_edge

._crit_edge:                                      ; preds = %._crit_edge.loopexit, %.preheader
  %10 = phi i32 [ %.pre, %._crit_edge.loopexit ], [ %8, %.preheader ]
  %11 = icmp sgt i32 %10, 3
  br i1 %11, label %.lr.ph22.preheader, label %._crit_edge23

.lr.ph22.preheader:                               ; preds = %._crit_edge
  %12 = add nsw i32 %10, -2
  br label %.lr.ph22

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %.preheader ]
  %13 = getelementptr inbounds i32, ptr @a, i64 %indvars.iv
  %14 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull %13)
  %15 = add nsw i64 %indvars.iv, -1
  %16 = getelementptr inbounds [50001 x i32], ptr @s, i64 0, i64 %15
  %17 = load i32, ptr %16, align 4, !tbaa !5
  %18 = load i32, ptr %13, align 4, !tbaa !5
  %19 = add nsw i32 %18, %17
  %20 = getelementptr inbounds [50001 x i32], ptr @s, i64 0, i64 %indvars.iv
  store i32 %19, ptr %20, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %21 = load i32, ptr @n, align 4, !tbaa !5
  %22 = sext i32 %21 to i64
  %.not.not = icmp slt i64 %indvars.iv, %22
  br i1 %.not.not, label %.lr.ph, label %._crit_edge.loopexit, !llvm.loop !9

.lr.ph22:                                         ; preds = %.lr.ph22.preheader, %.lr.ph22
  %.01420 = phi i32 [ %.1, %.lr.ph22 ], [ %12, %.lr.ph22.preheader ]
  %.01519 = phi i32 [ %.116, %.lr.ph22 ], [ 1, %.lr.ph22.preheader ]
  %23 = add nuw nsw i32 %.01420, %.01519
  %24 = lshr i32 %23, 1
  %25 = tail call noundef zeroext i1 @_Z5checki(i32 noundef %24)
  %26 = add nuw nsw i32 %24, 1
  %.116 = select i1 %25, i32 %.01519, i32 %26
  %.1 = select i1 %25, i32 %24, i32 %.01420
  %27 = icmp slt i32 %.116, %.1
  br i1 %27, label %.lr.ph22, label %._crit_edge23, !llvm.loop !11

._crit_edge23:                                    ; preds = %.lr.ph22, %._crit_edge
  %.015.lcssa = phi i32 [ 1, %._crit_edge ], [ %.116, %.lr.ph22 ]
  %28 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2, i32 noundef %.015.lcssa)
  %29 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @m, ptr noundef nonnull @n)
  %30 = icmp eq i32 %29, 2
  %31 = load i32, ptr @n, align 4
  %32 = load i32, ptr @m, align 4
  %33 = sub i32 0, %32
  %34 = icmp ne i32 %31, %33
  %35 = select i1 %30, i1 %34, i1 false
  br i1 %35, label %.preheader, label %._crit_edge24, !llvm.loop !12

._crit_edge24:                                    ; preds = %._crit_edge23, %0
  ret i32 0
}

; 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

attributes #0 = { mustprogress 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 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 #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" }

!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 = !{!"int", !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}
!12 = distinct !{!12, !10}


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