; LLVM IR from tangjz/acm-icpc :: buaa/oj3rd (948)

; 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.Node = type { i8, [3 x i8] }

@a = external dso_local global [30 x %struct.Node], align 16
@it = external dso_local global i8, align 1
@str = external dso_local global [300 x i8], align 16
@cnt = external dso_local global i8, align 1
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [10 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs1c(i8 noundef signext) #0

; Function Attrs: inlinehint mustprogress uwtable
declare i32 @putchar(i32 noundef) #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs2c(i8 noundef signext) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs3c(i8 noundef signext) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs4c(i8 noundef signext) #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5buildc(i8 noundef signext) #0

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

2:                                                ; preds = %5, %0
  %3 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @str)
  %4 = icmp ne i32 %3, -1
  br i1 %4, label %5, label %14

5:                                                ; preds = %2
  call void @llvm.memset.p0.i64(ptr align 16 @a, i8 0, i64 120, i1 false)
  store i8 0, ptr @it, align 1, !tbaa !5
  store i8 1, ptr @cnt, align 1, !tbaa !5
  call void @_Z5buildc(i8 noundef signext 1)
  %6 = call i32 (ptr, ...) @printf(ptr noundef @.str.1)
  call void @_Z4dfs1c(i8 noundef signext 1)
  %7 = call i32 @putchar(i32 noundef 10)
  %8 = call i32 (ptr, ...) @printf(ptr noundef @.str.2)
  call void @_Z4dfs2c(i8 noundef signext 1)
  %9 = call i32 @putchar(i32 noundef 10)
  %10 = call i32 (ptr, ...) @printf(ptr noundef @.str.3)
  call void @_Z4dfs3c(i8 noundef signext 1)
  %11 = call i32 @putchar(i32 noundef 10)
  %12 = call i32 (ptr, ...) @printf(ptr noundef @.str.4)
  call void @_Z4dfs4c(i8 noundef signext 1)
  %13 = call i32 @putchar(i32 noundef 10)
  br label %2, !llvm.loop !8

14:                                               ; preds = %2
  ret i32 0
}

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

; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

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

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 = { inlinehint 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 #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 = { nocallback nofree nounwind willreturn memory(argmem: write) }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"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.Node = type { i8, [3 x i8] }

@a = external dso_local local_unnamed_addr global [30 x %struct.Node], align 16
@it = external dso_local local_unnamed_addr global i8, align 1
@str = external dso_local global [300 x i8], align 16
@cnt = external dso_local local_unnamed_addr global i8, align 1
@.str = external hidden unnamed_addr constant [3 x i8], align 1
@.str.1 = external hidden unnamed_addr constant [6 x i8], align 1
@.str.2 = external hidden unnamed_addr constant [9 x i8], align 1
@.str.3 = external hidden unnamed_addr constant [10 x i8], align 1
@.str.4 = external hidden unnamed_addr constant [7 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs1c(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: inlinehint mustprogress nofree nounwind uwtable
declare noundef i32 @putchar(i32 noundef) local_unnamed_addr #1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs2c(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs3c(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4dfs4c(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5buildc(i8 noundef signext) local_unnamed_addr #0

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #2 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @str)
  %.not1 = icmp eq i32 %1, -1
  br i1 %.not1, label %._crit_edge, label %.lr.ph

.lr.ph:                                           ; preds = %0, %.lr.ph
  tail call void @llvm.memset.p0.i64(ptr noundef nonnull align 16 dereferenceable(120) @a, i8 0, i64 120, i1 false)
  store i8 0, ptr @it, align 1, !tbaa !5
  store i8 1, ptr @cnt, align 1, !tbaa !5
  tail call void @_Z5buildc(i8 noundef signext 1)
  %2 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.1)
  tail call void @_Z4dfs1c(i8 noundef signext 1)
  %3 = tail call i32 @putchar(i32 noundef 10)
  %4 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.2)
  tail call void @_Z4dfs2c(i8 noundef signext 1)
  %5 = tail call i32 @putchar(i32 noundef 10)
  %6 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.3)
  tail call void @_Z4dfs3c(i8 noundef signext 1)
  %7 = tail call i32 @putchar(i32 noundef 10)
  %8 = tail call i32 (ptr, ...) @printf(ptr noundef nonnull dereferenceable(1) @.str.4)
  tail call void @_Z4dfs4c(i8 noundef signext 1)
  %9 = tail call i32 @putchar(i32 noundef 10)
  %10 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @str)
  %.not = icmp eq i32 %10, -1
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

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

; Function Attrs: nofree nounwind
declare noundef i32 @__isoc99_scanf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

; Function Attrs: mustprogress nocallback nofree nounwind willreturn memory(argmem: write)
declare void @llvm.memset.p0.i64(ptr nocapture writeonly, i8, i64, i1 immarg) #4

; Function Attrs: nofree nounwind
declare noundef i32 @printf(ptr nocapture noundef readonly, ...) local_unnamed_addr #3

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 = { inlinehint mustprogress nofree 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 = { 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 = { 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 #4 = { mustprogress nocallback nofree nounwind willreturn memory(argmem: write) }

!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 = !{!"omnipotent char", !7, i64 0}
!7 = !{!"Simple C++ TBAA"}
!8 = distinct !{!8, !9}
!9 = !{!"llvm.loop.mustprogress"}


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