; LLVM IR from tangjz/acm-icpc :: 51nod (1305)

; 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
@x = external dso_local global i32, align 4
@s1 = external dso_local global i32, align 4
@s2 = external dso_local global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #0 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @n)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #3
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %4

4:                                                ; preds = %24, %0
  %5 = load i32, ptr %2, align 4, !tbaa !5
  %6 = load i32, ptr @n, align 4, !tbaa !5
  %7 = icmp slt i32 %5, %6
  br i1 %7, label %9, label %8

8:                                                ; preds = %4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #3
  br label %27

9:                                                ; preds = %4
  %10 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @x)
  %11 = load i32, ptr @x, align 4, !tbaa !5
  %12 = icmp eq i32 %11, 1
  br i1 %12, label %13, label %16

13:                                               ; preds = %9
  %14 = load i32, ptr @s1, align 4, !tbaa !5
  %15 = add nsw i32 %14, 1
  store i32 %15, ptr @s1, align 4, !tbaa !5
  br label %23

16:                                               ; preds = %9
  %17 = load i32, ptr @x, align 4, !tbaa !5
  %18 = icmp eq i32 %17, 2
  br i1 %18, label %19, label %22

19:                                               ; preds = %16
  %20 = load i32, ptr @s2, align 4, !tbaa !5
  %21 = add nsw i32 %20, 1
  store i32 %21, ptr @s2, align 4, !tbaa !5
  br label %22

22:                                               ; preds = %19, %16
  br label %23

23:                                               ; preds = %22, %13
  br label %24

24:                                               ; preds = %23
  %25 = load i32, ptr %2, align 4, !tbaa !5
  %26 = add nsw i32 %25, 1
  store i32 %26, ptr %2, align 4, !tbaa !5
  br label %4, !llvm.loop !9

27:                                               ; preds = %8
  %28 = load i32, ptr @s1, align 4, !tbaa !5
  %29 = sext i32 %28 to i64
  %30 = load i32, ptr @n, align 4, !tbaa !5
  %31 = sext i32 %30 to i64
  %32 = sub nsw i64 %31, 1
  %33 = mul nsw i64 %29, %32
  %34 = load i32, ptr @s2, align 4, !tbaa !5
  %35 = sext i32 %34 to i64
  %36 = load i32, ptr @s2, align 4, !tbaa !5
  %37 = sext i32 %36 to i64
  %38 = sub nsw i64 %37, 1
  %39 = mul nsw i64 %35, %38
  %40 = ashr i64 %39, 1
  %41 = add nsw i64 %33, %40
  %42 = call i32 (ptr, ...) @printf(ptr noundef @.str.1, i64 noundef %41)
  ret i32 0
}

declare i32 @__isoc99_scanf(ptr noundef, ...) #1

; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #2

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

declare i32 @printf(ptr noundef, ...) #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 = { "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 = { nocallback nofree nosync nounwind willreturn memory(argmem: readwrite) }
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 = !{!"int", !7, i64 0}
!7 = !{!"omnipotent char", !8, i64 0}
!8 = !{!"Simple C++ TBAA"}
!9 = distinct !{!9, !10}
!10 = !{!"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"

@n = external dso_local global i32, align 4
@x = external dso_local global i32, align 4
@s1 = external dso_local local_unnamed_addr global i32, align 4
@s2 = external dso_local local_unnamed_addr global i32, align 4
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1

; Function Attrs: mustprogress nofree norecurse nounwind uwtable
define dso_local noundef i32 @main() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @n)
  %2 = load i32, ptr @n, align 4, !tbaa !5
  %3 = icmp sgt i32 %2, 0
  br i1 %3, label %.lr.ph, label %._crit_edge

._crit_edge:                                      ; preds = %21, %0
  %.lcssa = phi i32 [ %2, %0 ], [ %23, %21 ]
  %4 = load i32, ptr @s1, align 4, !tbaa !5
  %5 = sext i32 %4 to i64
  %6 = sext i32 %.lcssa to i64
  %7 = add nsw i64 %6, -1
  %8 = mul nsw i64 %7, %5
  %9 = load i32, ptr @s2, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = add nsw i64 %10, -1
  %12 = mul nsw i64 %11, %10
  %13 = ashr i64 %12, 1
  %14 = add nsw i64 %13, %8
  %15 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1, i64 noundef %14)
  ret i32 0

.lr.ph:                                           ; preds = %0, %21
  %.04 = phi i32 [ %22, %21 ], [ 0, %0 ]
  %16 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @x)
  %17 = load i32, ptr @x, align 4, !tbaa !5
  switch i32 %17, label %21 [
    i32 1, label %.sink.split
    i32 2, label %18
  ]

18:                                               ; preds = %.lr.ph
  br label %.sink.split

.sink.split:                                      ; preds = %.lr.ph, %18
  %s1.sink8 = phi ptr [ @s2, %18 ], [ @s1, %.lr.ph ]
  %19 = load i32, ptr %s1.sink8, align 4, !tbaa !5
  %20 = add nsw i32 %19, 1
  store i32 %20, ptr %s1.sink8, align 4, !tbaa !5
  br label %21

21:                                               ; preds = %.sink.split, %.lr.ph
  %22 = add nuw nsw i32 %.04, 1
  %23 = load i32, ptr @n, align 4, !tbaa !5
  %24 = icmp slt i32 %22, %23
  br i1 %24, label %.lr.ph, label %._crit_edge, !llvm.loop !9
}

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #1

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


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