; LLVM IR from tangjz/acm-icpc :: 51nod (1382)

; 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"

%struct.Segment = type { i32, i32, i32, [4 x i64], [2 x ptr] }

@n = external dso_local global i32, align 4
@q = external dso_local global i32, align 4
@tot = external dso_local global i32, align 4
@__ = external dso_local global [262144 x %struct.Segment], align 16
@root = external dso_local global ptr, align 8
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment4initEii(ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) #0 align 2

; 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

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment6updateEii(ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment5queryEii(ptr dead_on_unwind noalias writable sret(%struct.Segment) align 8, ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN7Segment3maxEv(ptr noundef nonnull align 8 dereferenceable(64)) #3 align 2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #4 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca i32, align 4
  %5 = alloca %struct.Segment, align 8
  store i32 0, ptr %1, align 4
  %6 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.1, ptr noundef @n, ptr noundef @q)
  %7 = load i32, ptr @tot, align 4, !tbaa !5
  %8 = add nsw i32 %7, 1
  store i32 %8, ptr @tot, align 4, !tbaa !5
  %9 = sext i32 %7 to i64
  %10 = getelementptr inbounds %struct.Segment, ptr @__, i64 %9
  store ptr %10, ptr @root, align 8, !tbaa !9
  %11 = load ptr, ptr @root, align 8, !tbaa !9
  %12 = load i32, ptr @n, align 4, !tbaa !5
  %13 = sub nsw i32 %12, 1
  call void @_ZN7Segment4initEii(ptr noundef nonnull align 8 dereferenceable(64) %11, i32 noundef 0, i32 noundef %13)
  br label %14

14:                                               ; preds = %32, %0
  %15 = load i32, ptr @q, align 4, !tbaa !5
  %16 = add nsw i32 %15, -1
  store i32 %16, ptr @q, align 4, !tbaa !5
  %17 = icmp ne i32 %15, 0
  br i1 %17, label %18, label %33

18:                                               ; preds = %14
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %4) #5
  %19 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str.2, ptr noundef %2, ptr noundef %3, ptr noundef %4)
  %20 = load i32, ptr %2, align 4, !tbaa !5
  %21 = icmp eq i32 %20, 1
  br i1 %21, label %22, label %26

22:                                               ; preds = %18
  %23 = load ptr, ptr @root, align 8, !tbaa !9
  %24 = load i32, ptr %3, align 4, !tbaa !5
  %25 = load i32, ptr %4, align 4, !tbaa !5
  call void @_ZN7Segment6updateEii(ptr noundef nonnull align 8 dereferenceable(64) %23, i32 noundef %24, i32 noundef %25)
  br label %32

26:                                               ; preds = %18
  call void @llvm.lifetime.start.p0(i64 64, ptr %5) #5
  %27 = load ptr, ptr @root, align 8, !tbaa !9
  %28 = load i32, ptr %3, align 4, !tbaa !5
  %29 = load i32, ptr %4, align 4, !tbaa !5
  call void @_ZN7Segment5queryEii(ptr dead_on_unwind writable sret(%struct.Segment) align 8 %5, ptr noundef nonnull align 8 dereferenceable(64) %27, i32 noundef %28, i32 noundef %29)
  %30 = call noundef i64 @_ZN7Segment3maxEv(ptr noundef nonnull align 8 dereferenceable(64) %5)
  %31 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, i64 noundef %30)
  call void @llvm.lifetime.end.p0(i64 64, ptr %5) #5
  br label %32

32:                                               ; preds = %26, %22
  call void @llvm.lifetime.end.p0(i64 4, ptr %4) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %14, !llvm.loop !11

33:                                               ; preds = %14
  ret i32 0
}

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

attributes #0 = { mustprogress 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 = { 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 #4 = { 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 #5 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


; 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"

%struct.Segment = type { i32, i32, i32, [4 x i64], [2 x ptr] }

@n = external dso_local global i32, align 4
@q = external dso_local global i32, align 4
@tot = external dso_local local_unnamed_addr global i32, align 4
@__ = external dso_local global [262144 x %struct.Segment], align 16
@root = external dso_local local_unnamed_addr global ptr, align 8
@.str.1 = external hidden unnamed_addr constant [5 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [7 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment4initEii(ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) local_unnamed_addr #0 align 2

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

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment6updateEii(ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress uwtable
declare dso_local void @_ZN7Segment5queryEii(ptr dead_on_unwind noalias writable sret(%struct.Segment) align 8, ptr noundef nonnull align 8 dereferenceable(64), i32 noundef, i32 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZN7Segment3maxEv(ptr noundef nonnull align 8 dereferenceable(64)) local_unnamed_addr #3 align 2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #4 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca %struct.Segment, align 8
  %5 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.1, ptr noundef nonnull @n, ptr noundef nonnull @q)
  %6 = load i32, ptr @tot, align 4, !tbaa !5
  %7 = add nsw i32 %6, 1
  store i32 %7, ptr @tot, align 4, !tbaa !5
  %8 = sext i32 %6 to i64
  %9 = getelementptr inbounds %struct.Segment, ptr @__, i64 %8
  store ptr %9, ptr @root, align 8, !tbaa !9
  %10 = load i32, ptr @n, align 4, !tbaa !5
  %11 = add nsw i32 %10, -1
  tail call void @_ZN7Segment4initEii(ptr noundef nonnull align 8 dereferenceable(64) %9, i32 noundef 0, i32 noundef %11)
  %12 = load i32, ptr @q, align 4, !tbaa !5
  %13 = add nsw i32 %12, -1
  store i32 %13, ptr @q, align 4, !tbaa !5
  %.not1 = icmp eq i32 %12, 0
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %27
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %3) #5
  %14 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str.2, ptr noundef nonnull %1, ptr noundef nonnull %2, ptr noundef nonnull %3)
  %15 = load i32, ptr %1, align 4, !tbaa !5
  %16 = icmp eq i32 %15, 1
  br i1 %16, label %17, label %21

17:                                               ; preds = %.lr.ph
  %18 = load ptr, ptr @root, align 8, !tbaa !9
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = load i32, ptr %3, align 4, !tbaa !5
  call void @_ZN7Segment6updateEii(ptr noundef nonnull align 8 dereferenceable(64) %18, i32 noundef %19, i32 noundef %20)
  br label %27

21:                                               ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 64, ptr nonnull %4) #5
  %22 = load ptr, ptr @root, align 8, !tbaa !9
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = load i32, ptr %3, align 4, !tbaa !5
  call void @_ZN7Segment5queryEii(ptr dead_on_unwind nonnull writable sret(%struct.Segment) align 8 %4, ptr noundef nonnull align 8 dereferenceable(64) %22, i32 noundef %23, i32 noundef %24)
  %25 = call noundef i64 @_ZN7Segment3maxEv(ptr noundef nonnull align 8 dereferenceable(64) %4)
  %26 = call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3, i64 noundef %25)
  call void @llvm.lifetime.end.p0(i64 64, ptr nonnull %4) #5
  br label %27

27:                                               ; preds = %21, %17
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %3) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %2) #5
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  %28 = load i32, ptr @q, align 4, !tbaa !5
  %29 = add nsw i32 %28, -1
  store i32 %29, ptr @q, align 4, !tbaa !5
  %.not = icmp eq i32 %28, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !11

._crit_edge:                                      ; preds = %27, %0
  ret i32 0
}

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

attributes #0 = { mustprogress 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 = { 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 #4 = { 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 #5 = { 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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = distinct !{!11, !12}
!12 = !{!"llvm.loop.mustprogress"}


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