; LLVM IR from kazunetakahashi/atcoder :: 2018/1125_code-thanks-festival-2018 (F)

; 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::set" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }
%"class.std::basic_ostream" = type { ptr, %"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_istream" = type { ptr, i64, %"class.std::basic_ios" }
%"struct.std::pair" = type <{ %"struct.std::_Rb_tree_const_iterator", i8, [7 x i8] }>
%"struct.std::_Rb_tree_const_iterator" = type { ptr }

@N = external dso_local global i32, align 4
@M = external dso_local global i32, align 4
@K = external dso_local global i32, align 4
@P = external dso_local global [310 x i32], align 16
@root = external dso_local global i32, align 4
@children = external dso_local global [310 x %"class.std::set"], align 16
@used = external dso_local global [310 x i8], align 16
@ok = external dso_local global i8, align 1
@_ZSt4cerr = external global %"class.std::basic_ostream", align 8
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str.12 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5flushv() #0

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

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #3

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

; Function Attrs: mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) #0 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4initv() #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z8erasablei(i32 noundef) #0

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertERKi(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) #0 align 2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() #4 {
  %1 = alloca i32, align 4
  %2 = alloca i32, align 4
  %3 = alloca i32, align 4
  %4 = alloca %"struct.std::pair", align 8
  %5 = alloca i8, align 1
  %6 = alloca i32, align 4
  %7 = alloca i32, align 4
  %8 = alloca i8, align 1
  %9 = alloca i32, align 4
  store i32 0, ptr %1, align 4
  %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) @N)
  %11 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %10, ptr noundef nonnull align 4 dereferenceable(4) @M)
  %12 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %11, ptr noundef nonnull align 4 dereferenceable(4) @K)
  call void @llvm.lifetime.start.p0(i64 4, ptr %2) #5
  store i32 0, ptr %2, align 4, !tbaa !5
  br label %13

13:                                               ; preds = %28, %0
  %14 = load i32, ptr %2, align 4, !tbaa !5
  %15 = load i32, ptr @N, align 4, !tbaa !5
  %16 = icmp slt i32 %14, %15
  br i1 %16, label %18, label %17

17:                                               ; preds = %13
  call void @llvm.lifetime.end.p0(i64 4, ptr %2) #5
  br label %31

18:                                               ; preds = %13
  %19 = load i32, ptr %2, align 4, !tbaa !5
  %20 = sext i32 %19 to i64
  %21 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %20
  %22 = call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) %21)
  %23 = load i32, ptr %2, align 4, !tbaa !5
  %24 = sext i32 %23 to i64
  %25 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %24
  %26 = load i32, ptr %25, align 4, !tbaa !5
  %27 = add nsw i32 %26, -1
  store i32 %27, ptr %25, align 4, !tbaa !5
  br label %28

28:                                               ; preds = %18
  %29 = load i32, ptr %2, align 4, !tbaa !5
  %30 = add nsw i32 %29, 1
  store i32 %30, ptr %2, align 4, !tbaa !5
  br label %13, !llvm.loop !9

31:                                               ; preds = %17
  call void @llvm.lifetime.start.p0(i64 4, ptr %3) #5
  store i32 0, ptr %3, align 4, !tbaa !5
  br label %32

32:                                               ; preds = %58, %31
  %33 = load i32, ptr %3, align 4, !tbaa !5
  %34 = load i32, ptr @N, align 4, !tbaa !5
  %35 = icmp slt i32 %33, %34
  br i1 %35, label %37, label %36

36:                                               ; preds = %32
  call void @llvm.lifetime.end.p0(i64 4, ptr %3) #5
  br label %61

37:                                               ; preds = %32
  %38 = load i32, ptr %3, align 4, !tbaa !5
  %39 = sext i32 %38 to i64
  %40 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %39
  %41 = load i32, ptr %40, align 4, !tbaa !5
  %42 = icmp eq i32 %41, -1
  br i1 %42, label %43, label %45

43:                                               ; preds = %37
  %44 = load i32, ptr %3, align 4, !tbaa !5
  store i32 %44, ptr @root, align 4, !tbaa !5
  br label %57

45:                                               ; preds = %37
  %46 = load i32, ptr %3, align 4, !tbaa !5
  %47 = sext i32 %46 to i64
  %48 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %47
  %49 = load i32, ptr %48, align 4, !tbaa !5
  %50 = sext i32 %49 to i64
  %51 = getelementptr inbounds [310 x %"class.std::set"], ptr @children, i64 0, i64 %50
  %52 = call { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertERKi(ptr noundef nonnull align 8 dereferenceable(48) %51, ptr noundef nonnull align 4 dereferenceable(4) %3)
  %53 = getelementptr inbounds { ptr, i8 }, ptr %4, i32 0, i32 0
  %54 = extractvalue { ptr, i8 } %52, 0
  store ptr %54, ptr %53, align 8
  %55 = getelementptr inbounds { ptr, i8 }, ptr %4, i32 0, i32 1
  %56 = extractvalue { ptr, i8 } %52, 1
  store i8 %56, ptr %55, align 8
  br label %57

57:                                               ; preds = %45, %43
  br label %58

58:                                               ; preds = %57
  %59 = load i32, ptr %3, align 4, !tbaa !5
  %60 = add nsw i32 %59, 1
  store i32 %60, ptr %3, align 4, !tbaa !5
  br label %32, !llvm.loop !11

61:                                               ; preds = %36
  call void @_Z4initv()
  %62 = load i32, ptr @N, align 4, !tbaa !5
  %63 = sext i32 %62 to i64
  %64 = getelementptr inbounds i8, ptr @used, i64 %63
  call void @llvm.lifetime.start.p0(i64 1, ptr %5) #5
  store i8 0, ptr %5, align 1, !tbaa !12
  call void @_ZSt4fillIPbbEvT_S1_RKT0_(ptr noundef @used, ptr noundef %64, ptr noundef nonnull align 1 dereferenceable(1) %5)
  call void @llvm.lifetime.end.p0(i64 1, ptr %5) #5
  call void @llvm.lifetime.start.p0(i64 4, ptr %6) #5
  store i32 0, ptr %6, align 4, !tbaa !5
  br label %65

65:                                               ; preds = %104, %61
  %66 = load i32, ptr %6, align 4, !tbaa !5
  %67 = load i32, ptr @M, align 4, !tbaa !5
  %68 = icmp slt i32 %66, %67
  br i1 %68, label %70, label %69

69:                                               ; preds = %65
  store i32 8, ptr %7, align 4
  br label %107

70:                                               ; preds = %65
  call void @llvm.lifetime.start.p0(i64 1, ptr %8) #5
  store i8 0, ptr %8, align 1, !tbaa !12
  call void @llvm.lifetime.start.p0(i64 4, ptr %9) #5
  store i32 0, ptr %9, align 4, !tbaa !5
  br label %71

71:                                               ; preds = %92, %70
  %72 = load i32, ptr %9, align 4, !tbaa !5
  %73 = load i32, ptr @N, align 4, !tbaa !5
  %74 = icmp slt i32 %72, %73
  br i1 %74, label %76, label %75

75:                                               ; preds = %71
  store i32 11, ptr %7, align 4
  br label %95

76:                                               ; preds = %71
  %77 = load i32, ptr %9, align 4, !tbaa !5
  %78 = sext i32 %77 to i64
  %79 = getelementptr inbounds [310 x i8], ptr @used, i64 0, i64 %78
  %80 = load i8, ptr %79, align 1, !tbaa !12, !range !14, !noundef !15
  %81 = trunc i8 %80 to i1
  br i1 %81, label %82, label %83

82:                                               ; preds = %76
  br label %92

83:                                               ; preds = %76
  %84 = load i32, ptr %9, align 4, !tbaa !5
  %85 = call noundef zeroext i1 @_Z8erasablei(i32 noundef %84)
  br i1 %85, label %86, label %91

86:                                               ; preds = %83
  %87 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cerr, ptr noundef @.str.12)
  %88 = load i32, ptr %9, align 4, !tbaa !5
  %89 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %87, i32 noundef %88)
  %90 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %89, ptr noundef @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  store i8 1, ptr %8, align 1, !tbaa !12
  store i32 11, ptr %7, align 4
  br label %95

91:                                               ; preds = %83
  br label %92

92:                                               ; preds = %91, %82
  %93 = load i32, ptr %9, align 4, !tbaa !5
  %94 = add nsw i32 %93, 1
  store i32 %94, ptr %9, align 4, !tbaa !5
  br label %71, !llvm.loop !16

95:                                               ; preds = %86, %75
  call void @llvm.lifetime.end.p0(i64 4, ptr %9) #5
  br label %96

96:                                               ; preds = %95
  %97 = load i8, ptr %8, align 1, !tbaa !12, !range !14, !noundef !15
  %98 = trunc i8 %97 to i1
  br i1 %98, label %100, label %99

99:                                               ; preds = %96
  store i8 0, ptr @ok, align 1, !tbaa !12
  store i32 8, ptr %7, align 4
  br label %101

100:                                              ; preds = %96
  store i32 0, ptr %7, align 4
  br label %101

101:                                              ; preds = %100, %99
  call void @llvm.lifetime.end.p0(i64 1, ptr %8) #5
  %102 = load i32, ptr %7, align 4
  switch i32 %102, label %107 [
    i32 0, label %103
  ]

103:                                              ; preds = %101
  br label %104

104:                                              ; preds = %103
  %105 = load i32, ptr %6, align 4, !tbaa !5
  %106 = add nsw i32 %105, 1
  store i32 %106, ptr %6, align 4, !tbaa !5
  br label %65, !llvm.loop !17

107:                                              ; preds = %101, %69
  call void @llvm.lifetime.end.p0(i64 4, ptr %6) #5
  br label %108

108:                                              ; preds = %107
  call void @_Z5flushv()
  %109 = load i32, ptr %1, align 4
  ret i32 %109
}

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: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4fillIPbbEvT_S1_RKT0_(ptr noundef, ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) #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 = { 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 = { 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 = { 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 #5 = { 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 = !{!13, !13, i64 0}
!13 = !{!"bool", !7, i64 0}
!14 = !{i8 0, i8 2}
!15 = !{}
!16 = distinct !{!16, !10}
!17 = distinct !{!17, !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::set" = type { %"class.std::_Rb_tree" }
%"class.std::_Rb_tree" = type { %"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" }
%"struct.std::_Rb_tree<int, int, std::_Identity<int>, std::less<int>>::_Rb_tree_impl" = type { [8 x i8], %"struct.std::_Rb_tree_header" }
%"struct.std::_Rb_tree_header" = type { %"struct.std::_Rb_tree_node_base", i64 }
%"struct.std::_Rb_tree_node_base" = type { i32, ptr, ptr, ptr }
%"class.std::basic_ostream" = type { ptr, %"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_istream" = type { ptr, i64, %"class.std::basic_ios" }

@N = external dso_local global i32, align 4
@M = external dso_local global i32, align 4
@K = external dso_local global i32, align 4
@P = external dso_local global [310 x i32], align 16
@root = external dso_local local_unnamed_addr global i32, align 4
@children = external dso_local global [310 x %"class.std::set"], align 16
@used = external dso_local global [310 x i8], align 16
@ok = external dso_local local_unnamed_addr global i8, align 1
@_ZSt4cerr = external global %"class.std::basic_ostream", align 8
@_ZSt3cin = external global %"class.std::basic_istream", align 8
@.str.12 = external hidden unnamed_addr constant [8 x i8], align 1

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z5flushv() local_unnamed_addr #0

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

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #3

; 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 uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8), ptr noundef) local_unnamed_addr #0 align 2

; Function Attrs: inlinehint mustprogress uwtable
declare noundef nonnull align 8 dereferenceable(8) ptr @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_(ptr noundef nonnull align 8 dereferenceable(8)) #3

; Function Attrs: mustprogress uwtable
declare dso_local void @_Z4initv() local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local noundef zeroext i1 @_Z8erasablei(i32 noundef) local_unnamed_addr #0

; Function Attrs: mustprogress uwtable
declare dso_local { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertERKi(ptr noundef nonnull align 8 dereferenceable(48), ptr noundef nonnull align 4 dereferenceable(4)) local_unnamed_addr #0 align 2

; Function Attrs: mustprogress norecurse uwtable
define dso_local noundef i32 @main() local_unnamed_addr #4 {
  %1 = alloca i32, align 4
  %2 = alloca i8, align 1
  %3 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) @_ZSt3cin, ptr noundef nonnull align 4 dereferenceable(4) @N)
  %4 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %3, ptr noundef nonnull align 4 dereferenceable(4) @M)
  %5 = tail call noundef nonnull align 8 dereferenceable(16) ptr @_ZNSirsERi(ptr noundef nonnull align 8 dereferenceable(16) %4, ptr noundef nonnull align 4 dereferenceable(4) @K)
  %6 = load i32, ptr @N, align 4, !tbaa !5
  %7 = icmp sgt i32 %6, 0
  br i1 %7, label %.lr.ph, label %._crit_edge.thread

._crit_edge.thread:                               ; preds = %0
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  br label %._crit_edge28

._crit_edge:                                      ; preds = %.lr.ph
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %1) #5
  store i32 0, ptr %1, align 4, !tbaa !5
  %8 = icmp sgt i32 %13, 0
  br i1 %8, label %.lr.ph27, label %._crit_edge28

.lr.ph:                                           ; preds = %0, %.lr.ph
  %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ]
  %9 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %indvars.iv
  %10 = tail 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 = load i32, ptr %9, align 4, !tbaa !5
  %12 = add nsw i32 %11, -1
  store i32 %12, ptr %9, align 4, !tbaa !5
  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
  %13 = load i32, ptr @N, align 4, !tbaa !5
  %14 = sext i32 %13 to i64
  %15 = icmp slt i64 %indvars.iv.next, %14
  br i1 %15, label %.lr.ph, label %._crit_edge, !llvm.loop !9

._crit_edge28:                                    ; preds = %31, %._crit_edge.thread, %._crit_edge
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %1) #5
  call void @_Z4initv()
  %16 = load i32, ptr @N, align 4, !tbaa !5
  %17 = sext i32 %16 to i64
  %18 = getelementptr inbounds i8, ptr @used, i64 %17
  call void @llvm.lifetime.start.p0(i64 1, ptr nonnull %2) #5
  store i8 0, ptr %2, align 1, !tbaa !11
  call void @_ZSt4fillIPbbEvT_S1_RKT0_(ptr noundef nonnull @used, ptr noundef nonnull %18, ptr noundef nonnull align 1 dereferenceable(1) %2)
  call void @llvm.lifetime.end.p0(i64 1, ptr nonnull %2) #5
  %19 = load i32, ptr @M, align 4, !tbaa !5
  %20 = icmp sgt i32 %19, 0
  br i1 %20, label %.preheader, label %.loopexit

.lr.ph27:                                         ; preds = %._crit_edge, %31
  %21 = phi i32 [ %32, %31 ], [ %13, %._crit_edge ]
  %storemerge25 = phi i32 [ %34, %31 ], [ 0, %._crit_edge ]
  %22 = sext i32 %storemerge25 to i64
  %23 = getelementptr inbounds [310 x i32], ptr @P, i64 0, i64 %22
  %24 = load i32, ptr %23, align 4, !tbaa !5
  %25 = icmp eq i32 %24, -1
  br i1 %25, label %26, label %27

26:                                               ; preds = %.lr.ph27
  store i32 %storemerge25, ptr @root, align 4, !tbaa !5
  br label %31

27:                                               ; preds = %.lr.ph27
  %28 = sext i32 %24 to i64
  %29 = getelementptr inbounds [310 x %"class.std::set"], ptr @children, i64 0, i64 %28
  %30 = call { ptr, i8 } @_ZNSt3setIiSt4lessIiESaIiEE6insertERKi(ptr noundef nonnull align 8 dereferenceable(48) %29, ptr noundef nonnull align 4 dereferenceable(4) %1)
  %.pre = load i32, ptr %1, align 4, !tbaa !5
  %.pre38 = load i32, ptr @N, align 4, !tbaa !5
  br label %31

31:                                               ; preds = %26, %27
  %32 = phi i32 [ %21, %26 ], [ %.pre38, %27 ]
  %33 = phi i32 [ %storemerge25, %26 ], [ %.pre, %27 ]
  %34 = add nsw i32 %33, 1
  store i32 %34, ptr %1, align 4, !tbaa !5
  %35 = icmp slt i32 %34, %32
  br i1 %35, label %.lr.ph27, label %._crit_edge28, !llvm.loop !13

.preheader:                                       ; preds = %._crit_edge28, %.critedge21
  %.01631 = phi i32 [ %52, %.critedge21 ], [ 0, %._crit_edge28 ]
  %36 = load i32, ptr @N, align 4, !tbaa !5
  %37 = icmp sgt i32 %36, 0
  br i1 %37, label %.lr.ph30, label %.critedge22

.lr.ph30:                                         ; preds = %.preheader, %45
  %38 = phi i32 [ %46, %45 ], [ %36, %.preheader ]
  %indvars.iv35 = phi i64 [ %indvars.iv.next36, %45 ], [ 0, %.preheader ]
  %39 = getelementptr inbounds [310 x i8], ptr @used, i64 0, i64 %indvars.iv35
  %40 = load i8, ptr %39, align 1, !tbaa !11, !range !14, !noundef !15
  %41 = trunc nuw i8 %40 to i1
  br i1 %41, label %45, label %42

42:                                               ; preds = %.lr.ph30
  %43 = trunc nuw nsw i64 %indvars.iv35 to i32
  %44 = call noundef zeroext i1 @_Z8erasablei(i32 noundef %43)
  br i1 %44, label %.critedge21, label %._crit_edge39

._crit_edge39:                                    ; preds = %42
  %.pre40 = load i32, ptr @N, align 4, !tbaa !5
  br label %45

45:                                               ; preds = %._crit_edge39, %.lr.ph30
  %46 = phi i32 [ %.pre40, %._crit_edge39 ], [ %38, %.lr.ph30 ]
  %indvars.iv.next36 = add nuw nsw i64 %indvars.iv35, 1
  %47 = sext i32 %46 to i64
  %48 = icmp slt i64 %indvars.iv.next36, %47
  br i1 %48, label %.lr.ph30, label %.critedge22, !llvm.loop !16

.critedge21:                                      ; preds = %42
  %49 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZStlsISt11char_traitsIcEERSt13basic_ostreamIcT_ES5_PKc(ptr noundef nonnull align 8 dereferenceable(8) @_ZSt4cerr, ptr noundef nonnull @.str.12)
  %50 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEi(ptr noundef nonnull align 8 dereferenceable(8) %49, i32 noundef %43)
  %51 = call noundef nonnull align 8 dereferenceable(8) ptr @_ZNSolsEPFRSoS_E(ptr noundef nonnull align 8 dereferenceable(8) %50, ptr noundef nonnull @_ZSt4endlIcSt11char_traitsIcEERSt13basic_ostreamIT_T0_ES6_)
  %52 = add nuw nsw i32 %.01631, 1
  %53 = load i32, ptr @M, align 4, !tbaa !5
  %54 = icmp slt i32 %52, %53
  br i1 %54, label %.preheader, label %.loopexit, !llvm.loop !17

.critedge22:                                      ; preds = %.preheader, %45
  store i8 0, ptr @ok, align 1, !tbaa !11
  br label %.loopexit

.loopexit:                                        ; preds = %.critedge21, %._crit_edge28, %.critedge22
  call void @_Z5flushv()
  ret i32 0
}

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: inlinehint mustprogress uwtable
declare dso_local void @_ZSt4fillIPbbEvT_S1_RKT0_(ptr noundef, ptr noundef, ptr noundef nonnull align 1 dereferenceable(1)) 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 = { 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 = { 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 = { 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 #5 = { 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 = !{!12, !12, i64 0}
!12 = !{!"bool", !7, i64 0}
!13 = distinct !{!13, !10}
!14 = !{i8 0, i8 2}
!15 = !{}
!16 = distinct !{!16, !10}
!17 = distinct !{!17, !10}


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