; LLVM IR from tangjz/acm-icpc :: buaa/oj3rd (811)

; 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"

@str = external dso_local global [27 x i8], align 16
@.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
  %3 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  br label %4

4:                                                ; preds = %44, %0
  %5 = call i32 (ptr, ...) @__isoc99_scanf(ptr noundef @.str, ptr noundef @str)
  %6 = icmp eq i32 %5, 1
  br i1 %6, label %7, label %45

7:                                                ; preds = %4
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #4
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #4
  store i32 0, ptr %3, align 4, !tbaa !5
  store i32 1, ptr %2, align 4, !tbaa !5
  br label %8

8:                                                ; preds = %30, %7
  %9 = load i32, ptr %2, align 4, !tbaa !5
  %10 = sext i32 %9 to i64
  %11 = getelementptr inbounds [27 x i8], ptr @str, i64 0, i64 %10
  %12 = load i8, ptr %11, align 1, !tbaa !9
  %13 = sext i8 %12 to i32
  %14 = icmp ne i32 %13, 0
  br i1 %14, label %15, label %33

15:                                               ; preds = %8
  %16 = load i32, ptr %2, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds [27 x i8], ptr @str, i64 0, i64 %17
  %19 = load i8, ptr %18, align 1, !tbaa !9
  %20 = sext i8 %19 to i32
  %21 = load i32, ptr %2, align 4, !tbaa !5
  %22 = sub nsw i32 %21, 1
  %23 = sext i32 %22 to i64
  %24 = getelementptr inbounds [27 x i8], ptr @str, i64 0, i64 %23
  %25 = load i8, ptr %24, align 1, !tbaa !9
  %26 = sext i8 %25 to i32
  %27 = icmp sge i32 %20, %26
  br i1 %27, label %28, label %29

28:                                               ; preds = %15
  store i32 1, ptr %3, align 4, !tbaa !5
  br label %29

29:                                               ; preds = %28, %15
  br label %30

30:                                               ; preds = %29
  %31 = load i32, ptr %2, align 4, !tbaa !5
  %32 = add nsw i32 %31, 1
  store i32 %32, ptr %2, align 4, !tbaa !5
  br label %8, !llvm.loop !10

33:                                               ; preds = %8
  %34 = load i32, ptr %3, align 4, !tbaa !5
  %35 = icmp ne i32 %34, 0
  br i1 %35, label %36, label %42

36:                                               ; preds = %33
  %37 = load i32, ptr %2, align 4, !tbaa !5
  %38 = sext i32 %37 to i64
  %39 = getelementptr inbounds i8, ptr @str, i64 %38
  %40 = call noundef zeroext i1 @_ZSt16next_permutationIPcEbT_S1_(ptr noundef @str, ptr noundef %39)
  %41 = call i32 @puts(ptr noundef @str)
  br label %44

42:                                               ; preds = %33
  %43 = call i32 @puts(ptr noundef @.str.1)
  br label %44

44:                                               ; preds = %42, %36
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #4
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #4
  br label %4, !llvm.loop !12

45:                                               ; preds = %4
  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: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZSt16next_permutationIPcEbT_S1_(ptr noundef, ptr noundef) #3

declare i32 @puts(ptr noundef) #1

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

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 = { 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 #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 = !{!7, !7, i64 0}
!10 = distinct !{!10, !11}
!11 = !{!"llvm.loop.mustprogress"}
!12 = distinct !{!12, !11}


; 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"

@str = external dso_local global [27 x i8], align 16
@.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() local_unnamed_addr #0 {
  %1 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @str)
  %2 = icmp eq i32 %1, 1
  br i1 %2, label %.preheader, label %._crit_edge14

.preheader:                                       ; preds = %0, %._crit_edge.thread
  %3 = load i8, ptr getelementptr inbounds (i8, ptr @str, i64 1), align 1, !tbaa !5
  %.not10 = icmp eq i8 %3, 0
  br i1 %.not10, label %._crit_edge.thread, label %.lr.ph

.lr.ph:                                           ; preds = %.preheader, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 1, %.preheader ]
  %4 = phi i8 [ %9, %.lr.ph ], [ %3, %.preheader ]
  %.012 = phi i32 [ %spec.select, %.lr.ph ], [ 0, %.preheader ]
  %5 = add nsw i64 %indvars.iv, -1
  %6 = getelementptr inbounds [27 x i8], ptr @str, i64 0, i64 %5
  %7 = load i8, ptr %6, align 1, !tbaa !5
  %.not9 = icmp slt i8 %4, %7
  %spec.select = select i1 %.not9, i32 %.012, i32 1
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %8 = getelementptr inbounds [27 x i8], ptr @str, i64 0, i64 %indvars.iv.next
  %9 = load i8, ptr %8, align 1, !tbaa !5
  %.not = icmp eq i8 %9, 0
  br i1 %.not, label %._crit_edge, label %.lr.ph, !llvm.loop !8

._crit_edge:                                      ; preds = %.lr.ph
  %.not8 = icmp eq i32 %spec.select, 0
  br i1 %.not8, label %._crit_edge.thread, label %10

10:                                               ; preds = %._crit_edge
  %11 = getelementptr inbounds i8, ptr @str, i64 %indvars.iv.next
  %12 = tail call noundef zeroext i1 @_ZSt16next_permutationIPcEbT_S1_(ptr noundef nonnull @str, ptr noundef nonnull %11)
  br label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %._crit_edge, %.preheader, %10
  %.str.1.sink = phi ptr [ @str, %10 ], [ @.str.1, %.preheader ], [ @.str.1, %._crit_edge ]
  %13 = tail call i32 @puts(ptr noundef nonnull dereferenceable(1) %.str.1.sink)
  %14 = tail call i32 (ptr, ...) @__isoc99_scanf(ptr noundef nonnull @.str, ptr noundef nonnull @str)
  %15 = icmp eq i32 %14, 1
  br i1 %15, label %.preheader, label %._crit_edge14, !llvm.loop !10

._crit_edge14:                                    ; preds = %._crit_edge.thread, %0
  ret i32 0
}

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

; Function Attrs: inlinehint mustprogress uwtable
declare dso_local noundef zeroext i1 @_ZSt16next_permutationIPcEbT_S1_(ptr noundef, ptr noundef) local_unnamed_addr #2

; Function Attrs: nofree nounwind
declare noundef i32 @puts(ptr nocapture noundef readonly) local_unnamed_addr #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 = { 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 #2 = { 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" }

!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"}
!10 = distinct !{!10, !9}


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