; LLVM IR from TLE-MEC/Hack-CP-DSA :: Codeforces/Tram (solution)

; 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"

%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca ptr, align 8
  %4 = alloca i64, align 8
  %5 = alloca i32, align 4
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i32, align 4
  %9 = alloca i32, align 4
  %10 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  %11 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %2)
  %12 = load i32, ptr %2, align 4, !tbaa !5
  %13 = zext i32 %12 to i64
  %14 = call ptr @llvm.stacksave.p0()
  store ptr %14, ptr %3, align 8
  %15 = alloca [2 x i32], i64 %13, align 16
  store i64 %13, ptr %4, align 8
  call void @llvm.lifetime.start.p0(i64 4, ptr %5) #4
  store i32 0, ptr %5, align 4, !tbaa !5
  br label %16

16:                                               ; preds = %38, %0
  %17 = load i32, ptr %5, align 4, !tbaa !5
  %18 = load i32, ptr %2, align 4, !tbaa !5
  %19 = icmp slt i32 %17, %18
  br i1 %19, label %21, label %20

20:                                               ; preds = %16
  store i32 2, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %5) #4
  br label %41

21:                                               ; preds = %16
  call void @llvm.lifetime.start.p0(i64 4, ptr %7) #4
  store i32 0, ptr %7, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %34, %21
  %23 = load i32, ptr %7, align 4, !tbaa !5
  %24 = icmp slt i32 %23, 2
  br i1 %24, label %26, label %25

25:                                               ; preds = %22
  store i32 5, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %7) #4
  br label %37

26:                                               ; preds = %22
  %27 = load i32, ptr %5, align 4, !tbaa !5
  %28 = sext i32 %27 to i64
  %29 = getelementptr inbounds [2 x i32], ptr %15, i64 %28
  %30 = load i32, ptr %7, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = getelementptr inbounds [2 x i32], ptr %29, i64 0, i64 %31
  %33 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %32)
  br label %34

34:                                               ; preds = %26
  %35 = load i32, ptr %7, align 4, !tbaa !5
  %36 = add nsw i32 %35, 1
  store i32 %36, ptr %7, align 4, !tbaa !5
  br label %22, !llvm.loop !9

37:                                               ; preds = %25
  br label %38

38:                                               ; preds = %37
  %39 = load i32, ptr %5, align 4, !tbaa !5
  %40 = add nsw i32 %39, 1
  store i32 %40, ptr %5, align 4, !tbaa !5
  br label %16, !llvm.loop !11

41:                                               ; preds = %20
  call void @llvm.lifetime.start.p0(i64 4, ptr %8) #4
  %42 = getelementptr inbounds [2 x i32], ptr %15, i64 0
  %43 = getelementptr inbounds [2 x i32], ptr %42, i64 0, i64 1
  %44 = load i32, ptr %43, align 4, !tbaa !5
  store i32 %44, ptr %8, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #4
  %45 = getelementptr inbounds [2 x i32], ptr %15, i64 0
  %46 = getelementptr inbounds [2 x i32], ptr %45, i64 0, i64 1
  %47 = load i32, ptr %46, align 4, !tbaa !5
  store i32 %47, ptr %9, align 4, !tbaa !5
  call void @llvm.lifetime.start.p0(i64 4, ptr %10) #4
  store i32 1, ptr %10, align 4, !tbaa !5
  br label %48

48:                                               ; preds = %73, %41
  %49 = load i32, ptr %10, align 4, !tbaa !5
  %50 = load i32, ptr %2, align 4, !tbaa !5
  %51 = icmp slt i32 %49, %50
  br i1 %51, label %53, label %52

52:                                               ; preds = %48
  store i32 8, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %10) #4
  br label %76

53:                                               ; preds = %48
  %54 = load i32, ptr %9, align 4, !tbaa !5
  %55 = load i32, ptr %10, align 4, !tbaa !5
  %56 = sext i32 %55 to i64
  %57 = getelementptr inbounds [2 x i32], ptr %15, i64 %56
  %58 = getelementptr inbounds [2 x i32], ptr %57, i64 0, i64 1
  %59 = load i32, ptr %58, align 4, !tbaa !5
  %60 = add nsw i32 %54, %59
  %61 = load i32, ptr %10, align 4, !tbaa !5
  %62 = sext i32 %61 to i64
  %63 = getelementptr inbounds [2 x i32], ptr %15, i64 %62
  %64 = getelementptr inbounds [2 x i32], ptr %63, i64 0, i64 0
  %65 = load i32, ptr %64, align 8, !tbaa !5
  %66 = sub nsw i32 %60, %65
  store i32 %66, ptr %9, align 4, !tbaa !5
  %67 = load i32, ptr %9, align 4, !tbaa !5
  %68 = load i32, ptr %8, align 4, !tbaa !5
  %69 = icmp sgt i32 %67, %68
  br i1 %69, label %70, label %72

70:                                               ; preds = %53
  %71 = load i32, ptr %9, align 4, !tbaa !5
  store i32 %71, ptr %8, align 4, !tbaa !5
  br label %72

72:                                               ; preds = %70, %53
  br label %73

73:                                               ; preds = %72
  %74 = load i32, ptr %10, align 4, !tbaa !5
  %75 = add nsw i32 %74, 1
  store i32 %75, ptr %10, align 4, !tbaa !5
  br label %48, !llvm.loop !12

76:                                               ; preds = %52
  %77 = load i32, ptr %8, align 4, !tbaa !5
  %78 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %77)
  store i32 0, ptr %1, align 4
  store i32 1, ptr %6, align 4
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %8) #4
  %79 = load ptr, ptr %3, align 8
  call void @llvm.stackrestore.p0(ptr %79)
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  %80 = load i32, ptr %1, align 4
  ret i32 %80
}

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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) #2

; Function Attrs: nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

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 = { nocallback nofree nosync nounwind willreturn }
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"

%"class.std::basic_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"class.std::basic_ios" = type { %"class.std::ios_base", ptr, i8, i8, ptr, ptr, ptr, ptr }
%"class.std::ios_base" = type { ptr, i64, i64, i32, i32, i32, ptr, %"struct.std::ios_base::_Words", [8 x %"struct.std::ios_base::_Words"], i32, ptr, %"class.std::locale" }
%"struct.std::ios_base::_Words" = type { ptr, i64 }
%"class.std::locale" = type { ptr }
%"class.std::basic_ostream" = type { ptr, %"class.std::basic_ios" }

@_ZSt3cin = external global %"class.std::basic_istream", align 8
@_ZSt4cout = external global %"class.std::basic_ostream", align 8

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #6
  %2 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %3 = load i32, ptr %1, align 4, !tbaa !5
  %4 = zext i32 %3 to i64
  %5 = call ptr @llvm.stacksave.p0()
  %6 = alloca [2 x i32], i64 %4, align 16
  %7 = load i32, ptr %1, align 4, !tbaa !5
  %8 = icmp sgt i32 %7, 0
  call void @llvm.assume(i1 %8)
  br label %.preheader

.preheader:                                       ; preds = %0, %.preheader
  %indvars.iv = phi i64 [ %indvars.iv.next, %.preheader ], [ 0, %0 ]
  %9 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv, i64 0
  %10 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %9)
  %11 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv, i64 1
  %12 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %11)
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr %1, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = icmp slt i64 %indvars.iv.next, %14
  br i1 %15, label %.preheader, label %._crit_edge, !llvm.loop !9

._crit_edge:                                      ; preds = %.preheader
  %.phi.trans.insert = getelementptr inbounds i8, ptr %6, i64 4
  %.pre = load i32, ptr %.phi.trans.insert, align 4, !tbaa !5
  %16 = icmp sgt i32 %13, 1
  br i1 %16, label %.lr.ph.preheader, label %._crit_edge27

.lr.ph.preheader:                                 ; preds = %._crit_edge
  %wide.trip.count = zext nneg i32 %13 to i64
  %17 = add nsw i64 %wide.trip.count, -1
  %xtraiter = and i64 %17, 1
  %18 = icmp eq i32 %13, 2
  br i1 %18, label %._crit_edge27.loopexit.unr-lcssa, label %.lr.ph.preheader.new

.lr.ph.preheader.new:                             ; preds = %.lr.ph.preheader
  %unroll_iter = and i64 %17, -2
  br label %.lr.ph

._crit_edge27.loopexit.unr-lcssa:                 ; preds = %.lr.ph, %.lr.ph.preheader
  %spec.select.lcssa.ph = phi i32 [ poison, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %indvars.iv32.unr = phi i64 [ 1, %.lr.ph.preheader ], [ %indvars.iv.next33.1, %.lr.ph ]
  %.01624.unr = phi i32 [ %.pre, %.lr.ph.preheader ], [ %38, %.lr.ph ]
  %.01723.unr = phi i32 [ %.pre, %.lr.ph.preheader ], [ %spec.select.1, %.lr.ph ]
  %lcmp.mod.not = icmp eq i64 %xtraiter, 0
  br i1 %lcmp.mod.not, label %._crit_edge27, label %.lr.ph.epil

.lr.ph.epil:                                      ; preds = %._crit_edge27.loopexit.unr-lcssa
  %19 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv32.unr
  %20 = getelementptr inbounds i8, ptr %19, i64 4
  %21 = load i32, ptr %20, align 4, !tbaa !5
  %22 = add nsw i32 %21, %.01624.unr
  %23 = load i32, ptr %19, align 8, !tbaa !5
  %24 = sub i32 %22, %23
  %spec.select.epil = call i32 @llvm.smax.i32(i32 %24, i32 %.01723.unr)
  br label %._crit_edge27

._crit_edge27:                                    ; preds = %.lr.ph.epil, %._crit_edge27.loopexit.unr-lcssa, %._crit_edge
  %.017.lcssa = phi i32 [ %.pre, %._crit_edge ], [ %spec.select.lcssa.ph, %._crit_edge27.loopexit.unr-lcssa ], [ %spec.select.epil, %.lr.ph.epil ]
  %25 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cout, i32 noundef %.017.lcssa)
  call void @llvm.stackrestore.p0(ptr %5)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #6
  ret i32 0

.lr.ph:                                           ; preds = %.lr.ph, %.lr.ph.preheader.new
  %indvars.iv32 = phi i64 [ 1, %.lr.ph.preheader.new ], [ %indvars.iv.next33.1, %.lr.ph ]
  %.01624 = phi i32 [ %.pre, %.lr.ph.preheader.new ], [ %38, %.lr.ph ]
  %.01723 = phi i32 [ %.pre, %.lr.ph.preheader.new ], [ %spec.select.1, %.lr.ph ]
  %niter = phi i64 [ 0, %.lr.ph.preheader.new ], [ %niter.next.1, %.lr.ph ]
  %26 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv32
  %27 = getelementptr inbounds i8, ptr %26, i64 4
  %28 = load i32, ptr %27, align 4, !tbaa !5
  %29 = add nsw i32 %28, %.01624
  %30 = load i32, ptr %26, align 8, !tbaa !5
  %31 = sub i32 %29, %30
  %spec.select = call i32 @llvm.smax.i32(i32 %31, i32 %.01723)
  %32 = getelementptr inbounds [2 x i32], ptr %6, i64 %indvars.iv32
  %33 = getelementptr inbounds i8, ptr %32, i64 8
  %34 = getelementptr inbounds i8, ptr %32, i64 12
  %35 = load i32, ptr %34, align 4, !tbaa !5
  %36 = add nsw i32 %35, %31
  %37 = load i32, ptr %33, align 8, !tbaa !5
  %38 = sub i32 %36, %37
  %spec.select.1 = call i32 @llvm.smax.i32(i32 %38, i32 %spec.select)
  %indvars.iv.next33.1 = add nuw nsw i64 %indvars.iv32, 2
  %niter.next.1 = add i64 %niter, 2
  %niter.ncmp.1 = icmp eq i64 %niter.next.1, %unroll_iter
  br i1 %niter.ncmp.1, label %._crit_edge27.loopexit.unr-lcssa, label %.lr.ph, !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

declare noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare ptr @llvm.stacksave.p0() #3

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

declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8), i32 noundef) local_unnamed_addr #2

; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn
declare void @llvm.stackrestore.p0(ptr) #3

; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(none)
declare i32 @llvm.smax.i32(i32, i32) #4

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write)
declare void @llvm.assume(i1 noundef) #5

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 = { mustprogress 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 nocallback nofree nosync nounwind willreturn }
attributes #4 = { nocallback nofree nosync nounwind speculatable willreturn memory(none) }
attributes #5 = { nocallback nofree nosync nounwind willreturn memory(inaccessiblemem: write) }
attributes #6 = { 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}


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