; LLVM IR from DionysiosB/CodeForces :: 0800-0899 (862B-MahmoudAndEhabAndTheBipartiteness)

; 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.std::_Bit_reference" = type { ptr, i64 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfslRKSt6vectorIS_IlSaIlEESaIS1_EERS_IbSaIbEES8_b(i64 noundef %0, ptr noundef nonnull align 8 dereferenceable(24) %1, ptr noundef nonnull align 8 dereferenceable(40) %2, ptr noundef nonnull align 8 dereferenceable(40) %3, i1 noundef zeroext %4) #0 {
  %6 = alloca i64, align 8
  %7 = alloca ptr, align 8
  %8 = alloca ptr, align 8
  %9 = alloca ptr, align 8
  %10 = alloca i8, align 1
  %11 = alloca %"struct.std::_Bit_reference", align 8
  %12 = alloca %"struct.std::_Bit_reference", align 8
  %13 = alloca %"struct.std::_Bit_reference", align 8
  %14 = alloca i64, align 8
  %15 = alloca i32, align 4
  %16 = alloca i64, align 8
  %17 = alloca %"struct.std::_Bit_reference", align 8
  store i64 %0, ptr %6, align 8, !tbaa !5
  store ptr %1, ptr %7, align 8, !tbaa !9
  store ptr %2, ptr %8, align 8, !tbaa !9
  store ptr %3, ptr %9, align 8, !tbaa !9
  %18 = zext i1 %4 to i8
  store i8 %18, ptr %10, align 1, !tbaa !11
  call void @llvm.lifetime.start.p0(i64 16, ptr %11) #3
  %19 = load ptr, ptr %8, align 8, !tbaa !9
  %20 = load i64, ptr %6, align 8, !tbaa !5
  %21 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %19, i64 noundef %20)
  %22 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 0
  %23 = extractvalue { ptr, i64 } %21, 0
  store ptr %23, ptr %22, align 8
  %24 = getelementptr inbounds { ptr, i64 }, ptr %11, i32 0, i32 1
  %25 = extractvalue { ptr, i64 } %21, 1
  store i64 %25, ptr %24, align 8
  %26 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %11) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr %11) #3
  br i1 %26, label %27, label %28

27:                                               ; preds = %5
  br label %88

28:                                               ; preds = %5
  call void @llvm.lifetime.start.p0(i64 16, ptr %12) #3
  %29 = load ptr, ptr %8, align 8, !tbaa !9
  %30 = load i64, ptr %6, align 8, !tbaa !5
  %31 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %29, i64 noundef %30)
  %32 = getelementptr inbounds { ptr, i64 }, ptr %12, i32 0, i32 0
  %33 = extractvalue { ptr, i64 } %31, 0
  store ptr %33, ptr %32, align 8
  %34 = getelementptr inbounds { ptr, i64 }, ptr %12, i32 0, i32 1
  %35 = extractvalue { ptr, i64 } %31, 1
  store i64 %35, ptr %34, align 8
  %36 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %12, i1 noundef zeroext true) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr %12) #3
  %37 = load i8, ptr %10, align 1, !tbaa !11, !range !13, !noundef !14
  %38 = trunc i8 %37 to i1
  call void @llvm.lifetime.start.p0(i64 16, ptr %13) #3
  %39 = load ptr, ptr %9, align 8, !tbaa !9
  %40 = load i64, ptr %6, align 8, !tbaa !5
  %41 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %39, i64 noundef %40)
  %42 = getelementptr inbounds { ptr, i64 }, ptr %13, i32 0, i32 0
  %43 = extractvalue { ptr, i64 } %41, 0
  store ptr %43, ptr %42, align 8
  %44 = getelementptr inbounds { ptr, i64 }, ptr %13, i32 0, i32 1
  %45 = extractvalue { ptr, i64 } %41, 1
  store i64 %45, ptr %44, align 8
  %46 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %13, i1 noundef zeroext %38) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr %13) #3
  call void @llvm.lifetime.start.p0(i64 8, ptr %14) #3
  store i64 0, ptr %14, align 8, !tbaa !5
  br label %47

47:                                               ; preds = %84, %28
  %48 = load i64, ptr %14, align 8, !tbaa !5
  %49 = load ptr, ptr %7, align 8, !tbaa !9
  %50 = load i64, ptr %6, align 8, !tbaa !5
  %51 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %49, i64 noundef %50) #3
  %52 = call noundef i64 @_ZNKSt6vectorIlSaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %51) #3
  %53 = icmp ult i64 %48, %52
  br i1 %53, label %55, label %54

54:                                               ; preds = %47
  store i32 2, ptr %15, align 4
  call void @llvm.lifetime.end.p0(i64 8, ptr %14) #3
  br label %87

55:                                               ; preds = %47
  call void @llvm.lifetime.start.p0(i64 8, ptr %16) #3
  %56 = load ptr, ptr %7, align 8, !tbaa !9
  %57 = load i64, ptr %6, align 8, !tbaa !5
  %58 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %56, i64 noundef %57) #3
  %59 = load i64, ptr %14, align 8, !tbaa !5
  %60 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIlSaIlEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %58, i64 noundef %59) #3
  %61 = load i64, ptr %60, align 8, !tbaa !5
  store i64 %61, ptr %16, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr %17) #3
  %62 = load ptr, ptr %8, align 8, !tbaa !9
  %63 = load i64, ptr %16, align 8, !tbaa !5
  %64 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %62, i64 noundef %63)
  %65 = getelementptr inbounds { ptr, i64 }, ptr %17, i32 0, i32 0
  %66 = extractvalue { ptr, i64 } %64, 0
  store ptr %66, ptr %65, align 8
  %67 = getelementptr inbounds { ptr, i64 }, ptr %17, i32 0, i32 1
  %68 = extractvalue { ptr, i64 } %64, 1
  store i64 %68, ptr %67, align 8
  %69 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %17) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr %17) #3
  br i1 %69, label %70, label %71

70:                                               ; preds = %55
  store i32 4, ptr %15, align 4
  br label %81

71:                                               ; preds = %55
  %72 = load i64, ptr %16, align 8, !tbaa !5
  %73 = load ptr, ptr %7, align 8, !tbaa !9
  %74 = load ptr, ptr %8, align 8, !tbaa !9
  %75 = load ptr, ptr %9, align 8, !tbaa !9
  %76 = load i8, ptr %10, align 1, !tbaa !11, !range !13, !noundef !14
  %77 = trunc i8 %76 to i1
  %78 = zext i1 %77 to i32
  %79 = sub nsw i32 1, %78
  %80 = icmp ne i32 %79, 0
  call void @_Z3dfslRKSt6vectorIS_IlSaIlEESaIS1_EERS_IbSaIbEES8_b(i64 noundef %72, ptr noundef nonnull align 8 dereferenceable(24) %73, ptr noundef nonnull align 8 dereferenceable(40) %74, ptr noundef nonnull align 8 dereferenceable(40) %75, i1 noundef zeroext %80)
  store i32 0, ptr %15, align 4
  br label %81

81:                                               ; preds = %71, %70
  call void @llvm.lifetime.end.p0(i64 8, ptr %16) #3
  %82 = load i32, ptr %15, align 4
  switch i32 %82, label %89 [
    i32 0, label %83
    i32 4, label %84
  ]

83:                                               ; preds = %81
  br label %84

84:                                               ; preds = %83, %81
  %85 = load i64, ptr %14, align 8, !tbaa !5
  %86 = add nsw i64 %85, 1
  store i64 %86, ptr %14, align 8, !tbaa !5
  br label %47, !llvm.loop !15

87:                                               ; preds = %54
  br label %88

88:                                               ; preds = %87, %27
  ret void

89:                                               ; preds = %81
  unreachable
}

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

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40), i64 noundef) #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16)) #2 align 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 nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16), i1 noundef zeroext) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIlSaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIlSaIlEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) #2 align 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 = { 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 #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 = !{!10, !10, i64 0}
!10 = !{!"any pointer", !7, i64 0}
!11 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = !{i8 0, i8 2}
!14 = !{}
!15 = distinct !{!15, !16}
!16 = !{!"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.std::_Bit_reference" = type { ptr, i64 }

; Function Attrs: mustprogress uwtable
define dso_local void @_Z3dfslRKSt6vectorIS_IlSaIlEESaIS1_EERS_IbSaIbEES8_b(i64 noundef %0, ptr noundef nonnull align 8 dereferenceable(24) %1, ptr noundef nonnull align 8 dereferenceable(40) %2, ptr noundef nonnull align 8 dereferenceable(40) %3, i1 noundef zeroext %4) local_unnamed_addr #0 {
  %6 = alloca %"struct.std::_Bit_reference", align 8
  %7 = alloca %"struct.std::_Bit_reference", align 8
  %8 = alloca %"struct.std::_Bit_reference", align 8
  %9 = alloca %"struct.std::_Bit_reference", align 8
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %6) #3
  %10 = tail call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %2, i64 noundef %0)
  %11 = extractvalue { ptr, i64 } %10, 0
  store ptr %11, ptr %6, align 8
  %12 = getelementptr inbounds i8, ptr %6, i64 8
  %13 = extractvalue { ptr, i64 } %10, 1
  store i64 %13, ptr %12, align 8
  %14 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %6) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %6) #3
  br i1 %14, label %.loopexit, label %15

15:                                               ; preds = %5
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %7) #3
  %16 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %2, i64 noundef %0)
  %17 = extractvalue { ptr, i64 } %16, 0
  store ptr %17, ptr %7, align 8
  %18 = getelementptr inbounds i8, ptr %7, i64 8
  %19 = extractvalue { ptr, i64 } %16, 1
  store i64 %19, ptr %18, align 8
  %20 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %7, i1 noundef zeroext true) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %7) #3
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %8) #3
  %21 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %3, i64 noundef %0)
  %22 = extractvalue { ptr, i64 } %21, 0
  store ptr %22, ptr %8, align 8
  %23 = getelementptr inbounds i8, ptr %8, i64 8
  %24 = extractvalue { ptr, i64 } %21, 1
  store i64 %24, ptr %23, align 8
  %25 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16) %8, i1 noundef zeroext %4) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %8) #3
  %26 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %0) #3
  %27 = call noundef i64 @_ZNKSt6vectorIlSaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %26) #3
  %.not = icmp eq i64 %27, 0
  br i1 %.not, label %.loopexit, label %.lr.ph

.lr.ph:                                           ; preds = %15
  %28 = getelementptr inbounds i8, ptr %9, i64 8
  %not. = xor i1 %4, true
  br label %29

29:                                               ; preds = %.lr.ph, %38
  %.020 = phi i64 [ 0, %.lr.ph ], [ %39, %38 ]
  %30 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %0) #3
  %31 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIlSaIlEEixEm(ptr noundef nonnull align 8 dereferenceable(24) %30, i64 noundef %.020) #3
  %32 = load i64, ptr %31, align 8, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 16, ptr nonnull %9) #3
  %33 = call { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40) %2, i64 noundef %32)
  %34 = extractvalue { ptr, i64 } %33, 0
  store ptr %34, ptr %9, align 8
  %35 = extractvalue { ptr, i64 } %33, 1
  store i64 %35, ptr %28, align 8
  %36 = call noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16) %9) #3
  call void @llvm.lifetime.end.p0(i64 16, ptr nonnull %9) #3
  br i1 %36, label %38, label %37

37:                                               ; preds = %29
  call void @_Z3dfslRKSt6vectorIS_IlSaIlEESaIS1_EERS_IbSaIbEES8_b(i64 noundef %32, ptr noundef nonnull align 8 dereferenceable(24) %1, ptr noundef nonnull align 8 dereferenceable(40) %2, ptr noundef nonnull align 8 dereferenceable(40) %3, i1 noundef zeroext %not.)
  br label %38

38:                                               ; preds = %29, %37
  %39 = add nuw nsw i64 %.020, 1
  %40 = call noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24) %1, i64 noundef %0) #3
  %41 = call noundef i64 @_ZNKSt6vectorIlSaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24) %40) #3
  %42 = icmp ult i64 %39, %41
  br i1 %42, label %29, label %.loopexit, !llvm.loop !9

.loopexit:                                        ; preds = %38, %15, %5
  ret void
}

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

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i64 } @_ZNSt6vectorIbSaIbEEixEm(ptr noundef nonnull align 8 dereferenceable(40), i64 noundef) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef zeroext i1 @_ZNKSt14_Bit_referencecvbEv(ptr noundef nonnull align 8 dereferenceable(16)) local_unnamed_addr #2 align 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 nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(16) ptr @_ZNSt14_Bit_referenceaSEb(ptr noundef nonnull align 8 dereferenceable(16), i1 noundef zeroext) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(24) ptr @_ZNKSt6vectorIS_IlSaIlEESaIS1_EEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef i64 @_ZNKSt6vectorIlSaIlEE4sizeEv(ptr noundef nonnull align 8 dereferenceable(24)) local_unnamed_addr #2 align 2

; Function Attrs: mustprogress nounwind uwtable
declare dso_local noundef nonnull align 8 dereferenceable(8) ptr @_ZNKSt6vectorIlSaIlEEixEm(ptr noundef nonnull align 8 dereferenceable(24), i64 noundef) local_unnamed_addr #2 align 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 = { 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 #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"}


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