pub use __cargo_equip::prelude::*; #[allow(unused_imports)] use proconio::{ input, marker::{Bytes, Chars, Usize1}, }; use two_satisfiability::TwoSatisfiability; fn main() { input! { n: usize, u: [Bytes; n], } if n > 52 { println!("Impossible"); return; } let cv = |c: u8| -> usize { (if c.is_ascii_lowercase() { c - b'a' } else { c - b'A' + 26 }) as usize }; let mut xy = vec![[[0; 2]; 2]; n]; for i in 0..n { xy[i][0][0] = cv(u[i][0]) * 52 + cv(u[i][1]); xy[i][0][1] = cv(u[i][2]); xy[i][1][0] = cv(u[i][1]) * 52 + cv(u[i][2]); xy[i][1][1] = cv(u[i][0]); } let mut ts = TwoSatisfiability::new(n); for i in 0..n { for j in 0..i { for k in 0..2 { for l in 0..2 { let f = xy[i][k][0] == xy[j][l][0] || xy[i][k][1] == xy[j][l][1]; if f { let ii = if k == 0 { i } else { !i }; let jj = if l == 0 { j } else { !j }; ts.if_then(ii, !jj); ts.if_then(jj, !ii); } } } } } if let Some(res) = ts.solve() { for i in 0..n { if res[i] { println!("{}{} {}", u[i][0] as char, u[i][1] as char, u[i][2] as char); } else { println!("{} {}{}", u[i][0] as char, u[i][1] as char, u[i][2] as char); } } } else { println!("Impossible"); } } // The following code was expanded by `cargo-equip`. /// # Bundled libraries /// /// - `graph 0.1.0 (path+████████████████████████████████████████████████)` published in **missing** licensed under `CC0-1.0` as `crate::__cargo_equip::crates::graph` /// - `lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)` licensed under `MIT/Apache-2.0` as `crate::__cargo_equip::crates::__lazy_static_1_4_0` /// - `proconio 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)` licensed under `MIT OR Apache-2.0` as `crate::__cargo_equip::crates::proconio` /// - `strongly-connected-components 0.1.0 (path+████████████████████████████████████████████████████████████████████████)` published in **missing** licensed under `CC0-1.0` as `crate::__cargo_equip::crates::strongly_connected_components` /// - `two-satisfiability 0.1.0 (path+████████████████████████████████████████████████████████████)` published in **missing** licensed under `CC0-1.0` as `crate::__cargo_equip::crates::two_satisfiability` /// /// # Procedural macros /// /// - `proconio-derive 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)` licensed under `MIT OR Apache-2.0` /// /// # License and Copyright Notices /// /// - `lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)` /// /// ```text /// Copyright (c) 2010 The Rust Project Developers /// /// Permission is hereby granted, free of charge, to any /// person obtaining a copy of this software and associated /// documentation files (the "Software"), to deal in the /// Software without restriction, including without /// limitation the rights to use, copy, modify, merge, /// publish, distribute, sublicense, and/or sell copies of /// the Software, and to permit persons to whom the Software /// is furnished to do so, subject to the following /// conditions: /// /// The above copyright notice and this permission notice /// shall be included in all copies or substantial portions /// of the Software. /// /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF /// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED /// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A /// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT /// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY /// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION /// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR /// IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER /// DEALINGS IN THE SOFTWARE. /// ``` /// /// - `proconio 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)` /// /// ```text /// The MIT License /// Copyright 2019 (C) statiolake /// /// Permission is hereby granted, free of charge, to any person obtaining a copy of /// this software and associated documentation files (the "Software"), to deal in /// the Software without restriction, including without limitation the rights to /// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of /// the Software, and to permit persons to whom the Software is furnished to do so, /// subject to the following conditions: /// /// The above copyright notice and this permission notice shall be included in all /// copies or substantial portions of the Software. /// /// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR /// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS /// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR /// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER /// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN /// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. /// /// Copyright for original `input!` macro is held by Hideyuki Tanaka, 2019. The /// original macro is licensed under BSD 3-clause license. /// /// Redistribution and use in source and binary forms, with or without /// modification, are permitted provided that the following conditions are met: /// /// 1. Redistributions of source code must retain the above copyright notice, this /// list of conditions and the following disclaimer. /// /// 2. Redistributions in binary form must reproduce the above copyright notice, /// this list of conditions and the following disclaimer in the documentation /// and/or other materials provided with the distribution. /// /// 3. Neither the name of the copyright holder nor the names of its contributors /// may be used to endorse or promote products derived from this software /// without specific prior written permission. /// /// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND /// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED /// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE /// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE /// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL /// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR /// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER /// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, /// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE /// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. /// ``` #[cfg_attr(any(), rustfmt::skip)] #[allow(unused)] mod __cargo_equip { pub(crate) mod crates { pub mod graph {#[derive(Clone)]pub struct Graphwhere V:Clone,E:Clone,{vertices:Vec,head:Vec,next:Vec,edges:Vec<(usize,E)>,}pub const GRID_NEIGHBOURS_4:&[(usize,usize)]=&[(!0,0),(0,!0),(1,0),(0,1)];pub const GRID_NEIGHBOURS_8:&[(usize,usize)]=&[(!0,0),(0,!0),(1,0),(0,1),(!0,!0),(!0,1),(1,!0),(1,1),];implGraphwhere V:Clone+Default,E:Clone,{pub fn new(n:usize)->Self{Self{vertices:vec![Default::default();n],head:vec![!0;n],next:vec![],edges:vec![],}}}implFrom>for Graphwhere V:Clone,E:Clone,{fn from(vertices:Vec)->Self{Self{head:vec![!0;vertices.len()],vertices,next:vec![],edges:vec![],}}}implGraphwhere V:Clone,E:Clone,{pub fn size(&self)->usize{self.vertices.len()}pub fn set_vertex(&mut self,v:usize,w:V){self.vertices[v]=w;}pub fn add_vertex(&mut self,w:V)->usize{self.vertices.push(w);self.head.push(!0);self.vertices.len()-1}pub fn add_edge(&mut self,u:usize,v:usize,w:E){self.next.push(self.head[u]);self.head[u]=self.edges.len();self.edges.push((v,w));}pub fn add_undirected_edge(&mut self,u:usize,v:usize,w:E){self.add_edge(u,v,w.clone());self.add_edge(v,u,w);}pub fn vertices(&self)->&[V]{&self.vertices}pub fn out_edges(&self,v:usize)->impl Iterator{let mut e=self.head[v];std::iter::from_fn(move||{if e!=!0{let res=&self.edges[e];e=self.next[e];Some(res)}else{None}})}pub fn from_grid(grid:&Vec>,neighbours:&[(usize,usize)],cost:impl Fn(&V,&V)->Option,)->Self{let h=grid.len();let w=grid[0].len();let mut g=Self::from(grid.into_iter().flatten().cloned().collect::>());for i in 0..h{for j in 0..w{for&(di,dj)in neighbours{let ni=i.wrapping_add(di);let nj=j.wrapping_add(dj);if ni>=h||nj>=w{continue;}if let Some(c)=cost(&grid[i][j],&grid[ni][nj]){g.add_edge(i*w+j,ni*w+nj,c);}}}}g}}} pub mod __lazy_static_1_4_0 {#![no_std]use crate::__cargo_equip::preludes::__lazy_static_1_4_0::*;pub use crate::__cargo_equip::macros::__lazy_static_1_4_0::*;#[path="inline_lazy.rs"]pub mod lazy{use crate::__cargo_equip::preludes::__lazy_static_1_4_0::*;extern crate core;extern crate std;use self::std::prelude::v1::*;use self::std::cell::Cell;use self::std::hint::unreachable_unchecked;use self::std::sync::Once;#[allow(deprecated)]pub use self::std::sync::ONCE_INIT;pub struct Lazy(Cell>,Once);implLazy{#[allow(deprecated)]pub const INIT:Self=Lazy(Cell::new(None),ONCE_INIT);#[inline(always)]pub fn get(&'static self,f:F)->&T where F:FnOnce()->T,{self.1.call_once(||{self.0.set(Some(f()));});unsafe{match*self.0.as_ptr(){Some(ref x)=>x,None=>{debug_assert!(false,"attempted to derefence an uninitialized lazy static. This is a bug");unreachable_unchecked()},}}}}unsafe implSync for Lazy{}#[macro_export]macro_rules!__cargo_equip_macro_def___lazy_static_1_4_0___lazy_static_create{($NAME:ident,$T:ty)=>{static$NAME:$crate::__cargo_equip::crates::__lazy_static_1_4_0::lazy::Lazy<$T> =$crate::__cargo_equip::crates::__lazy_static_1_4_0::lazy::Lazy::INIT;};}macro_rules!__lazy_static_create{($($tt:tt)*)=>(crate::__cargo_equip_macro_def___lazy_static_1_4_0___lazy_static_create!{$($tt)*})}}pub use core::ops::Deref as __Deref;#[macro_export(local_inner_macros)]macro_rules!__cargo_equip_macro_def___lazy_static_1_4_0___lazy_static_internal{($(#[$attr:meta])*($($vis:tt)*)static ref$N:ident:$T:ty=$e:expr;$($t:tt)*)=>{__lazy_static_internal!(@MAKE TY,$(#[$attr])*,($($vis)*),$N);__lazy_static_internal!(@TAIL,$N:$T=$e);lazy_static!($($t)*);};(@TAIL,$N:ident:$T:ty=$e:expr)=>{impl$crate::__cargo_equip::crates::__lazy_static_1_4_0::__Deref for$N{type Target=$T;fn deref(&self)->&$T{#[inline(always)]fn __static_ref_initialize()->$T{$e}#[inline(always)]fn __stability()->&'static$T{__lazy_static_create!(LAZY,$T);LAZY.get(__static_ref_initialize)}__stability()}}impl$crate::__cargo_equip::crates::__lazy_static_1_4_0::LazyStatic for$N{fn initialize(lazy:&Self){let _=&**lazy;}}};(@MAKE TY,$(#[$attr:meta])*,($($vis:tt)*),$N:ident)=>{#[allow(missing_copy_implementations)]#[allow(non_camel_case_types)]#[allow(dead_code)]$(#[$attr])*$($vis)*struct$N{__private_field:()}#[doc(hidden)]$($vis)*static$N:$N=$N{__private_field:()};};()=>()}macro_rules!__lazy_static_internal{($($tt:tt)*)=>(crate::__cargo_equip_macro_def___lazy_static_1_4_0___lazy_static_internal!{$($tt)*})}#[macro_export(local_inner_macros)]macro_rules!__cargo_equip_macro_def___lazy_static_1_4_0_lazy_static{($(#[$attr:meta])*static ref$N:ident:$T:ty=$e:expr;$($t:tt)*)=>{__lazy_static_internal!($(#[$attr])*()static ref$N:$T=$e;$($t)*);};($(#[$attr:meta])*pub static ref$N:ident:$T:ty=$e:expr;$($t:tt)*)=>{__lazy_static_internal!($(#[$attr])*(pub)static ref$N:$T=$e;$($t)*);};($(#[$attr:meta])*pub($($vis:tt)+)static ref$N:ident:$T:ty=$e:expr;$($t:tt)*)=>{__lazy_static_internal!($(#[$attr])*(pub($($vis)+))static ref$N:$T=$e;$($t)*);};()=>()}macro_rules!lazy_static{($($tt:tt)*)=>(crate::__cargo_equip_macro_def___lazy_static_1_4_0_lazy_static!{$($tt)*})}pub trait LazyStatic{fn initialize(lazy:&Self);}pub fn initialize(lazy:&T){LazyStatic::initialize(lazy);}} pub mod proconio {#![allow(clippy::needless_doctest_main,clippy::print_literal)]use crate::__cargo_equip::preludes::proconio::*;pub use crate::__cargo_equip::macros::proconio::*;pub use proconio_derive::*;pub mod marker{use crate::__cargo_equip::preludes::proconio::*;use crate::__cargo_equip::crates::proconio::source::{Readable,Source};use std::io::BufRead;pub enum Chars{}impl Readable for Chars{type Output=Vec;fn read>(source:&mut S)->Vec{source.next_token_unwrap().chars().collect()}}pub enum Bytes{}impl Readable for Bytes{type Output=Vec;fn read>(source:&mut S)->Vec{source.next_token_unwrap().bytes().collect()}}pub enum Usize1{}impl Readable for Usize1{type Output=usize;fn read>(source:&mut S)->usize{usize::read(source).checked_sub(1).expect("attempted to read the value 0 as a Usize1")}}pub enum Isize1{}impl Readable for Isize1{type Output=isize;fn read>(source:&mut S)->isize{isize::read(source).checked_sub(1).unwrap_or_else(||{panic!(concat!("attempted to read the value {} as a Isize1:"," the value is isize::MIN and cannot be decremented"),std::isize::MIN,)})}}}pub mod source{use crate::__cargo_equip::preludes::proconio::*;use std::any::type_name;use std::fmt::Debug;use std::io::BufRead;use std::str::FromStr;pub mod line{use crate::__cargo_equip::preludes::proconio::*;use super::Source;use std::io::BufRead;use std::iter::Peekable;use std::str::SplitWhitespace;pub struct LineSource{tokens:Peekable>,current_context:Box,reader:R,}implLineSource{pub fn new(reader:R)->LineSource{LineSource{current_context:"".to_string().into_boxed_str(),tokens:"".split_whitespace().peekable(),reader,}}fn prepare(&mut self){while self.tokens.peek().is_none(){let mut line=String::new();let num_bytes=self.reader.read_line(&mut line).expect("failed to get linel maybe an IO error.");if num_bytes==0{return;}self.current_context=line.into_boxed_str();self.tokens=unsafe{std::mem::transmute::<_,&'static str>(&*self.current_context)}.split_whitespace().peekable();}}}implSourcefor LineSource{fn next_token(&mut self)->Option<&str>{self.prepare();self.tokens.next()}fn is_empty(&mut self)->bool{self.prepare();self.tokens.peek().is_none()}}use std::io::BufReader;impl<'a>From<&'a str>for LineSource>{fn from(s:&'a str)->LineSource>{LineSource::new(BufReader::new(s.as_bytes()))}}}pub mod once{use crate::__cargo_equip::preludes::proconio::*;use super::Source;use std::io::BufRead;use std::iter::Peekable;use std::marker::PhantomData;use std::str::SplitWhitespace;pub struct OnceSource{tokens:Peekable>,context:Box,_read:PhantomData,}implOnceSource{pub fn new(mut source:R)->OnceSource{let mut context=String::new();source.read_to_string(&mut context).expect("failed to read from source; maybe an IO error.");let context=context.into_boxed_str();let mut res=OnceSource{context,tokens:"".split_whitespace().peekable(),_read:PhantomData,};use std::mem;let context:&'static str=unsafe{mem::transmute(&*res.context)};res.tokens=context.split_whitespace().peekable();res}}implSourcefor OnceSource{fn next_token(&mut self)->Option<&str>{self.tokens.next()}fn is_empty(&mut self)->bool{self.tokens.peek().is_none()}}use std::io::BufReader;impl<'a>From<&'a str>for OnceSource>{fn from(s:&'a str)->OnceSource>{OnceSource::new(BufReader::new(s.as_bytes()))}}}pub mod auto{use crate::__cargo_equip::preludes::proconio::*;#[cfg(debug_assertions)]pub use super::line::LineSource as AutoSource;#[cfg(not(debug_assertions))]pub use super::once::OnceSource as AutoSource;}pub trait Source{fn next_token(&mut self)->Option<&str>;fn is_empty(&mut self)->bool;fn next_token_unwrap(&mut self)->&str{self.next_token().expect(concat!("failed to get the next token; ","maybe reader reached an end of input. ","ensure that arguments for `input!` macro is correctly ","specified to match the problem input."))}}impl>Sourcefor&'_ mut S{fn next_token(&mut self)->Option<&str>{(*self).next_token()}fn is_empty(&mut self)->bool{(*self).is_empty()}}pub trait Readable{type Output;fn read>(source:&mut S)->Self::Output;}implReadable for T where T::Err:Debug,{type Output=T;fn read>(source:&mut S)->T{let token=source.next_token_unwrap();match token.parse(){Ok(v)=>v,Err(e)=>panic!(concat!("failed to parse the input `{input}` ","to the value of type `{ty}`: {err:?}; ","ensure that the input format is collectly specified ","and that the input value must handle specified type.",),input=token,ty=type_name::(),err=e,),}}}}use crate::__cargo_equip::crates::proconio::source::auto::AutoSource;use lazy_static::lazy_static;use std::io;use std::io::{BufReader,Stdin};use std::sync::Mutex;pub use crate::__cargo_equip::crates::proconio::source::Readable as __Readable;lazy_static!{#[doc(hidden)]pub static ref STDIN_SOURCE:Mutex>>=Mutex::new(AutoSource::new(BufReader::new(io::stdin())));}#[macro_export]macro_rules!__cargo_equip_macro_def_proconio_input{(@from[$source:expr]@rest)=>{};(@from[$source:expr]@rest mut$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::input!{@from[$source]@mut[mut]@rest$($rest)*}};(@from[$source:expr]@rest$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::input!{@from[$source]@mut[]@rest$($rest)*}};(@from[$source:expr]@mut[$($mut:tt)?]@rest$var:tt:$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::input!{@from[$source]@mut[$($mut)*]@var$var@kind[]@rest$($rest)*}};(@from[$source:expr]@mut[$($mut:tt)?]@var$var:tt@kind[$($kind:tt)*]@rest)=>{let$($mut)*$var=$crate::__cargo_equip::crates::proconio::read_value!(@source[$source]@kind[$($kind)*]);};(@from[$source:expr]@mut[$($mut:tt)?]@var$var:tt@kind[$($kind:tt)*]@rest,$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::input!(@from[$source]@mut[$($mut)*]@var$var@kind[$($kind)*]@rest);$crate::__cargo_equip::crates::proconio::input!(@from[$source]@rest$($rest)*);};(@from[$source:expr]@mut[$($mut:tt)?]@var$var:tt@kind[$($kind:tt)*]@rest$tt:tt$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::input!(@from[$source]@mut[$($mut)*]@var$var@kind[$($kind)*$tt]@rest$($rest)*);};(from$source:expr,$($rest:tt)*)=>{#[allow(unused_variables,unused_mut)]let mut s=$source;$crate::__cargo_equip::crates::proconio::input!{@from[&mut s]@rest$($rest)*}};($($rest:tt)*)=>{let mut locked_stdin=$crate::__cargo_equip::crates::proconio::STDIN_SOURCE.lock().expect(concat!("failed to lock the stdin; please re-run this program. ","If this issue repeatedly occur, this is a bug in `proconio`. ","Please report this issue from ","."));$crate::__cargo_equip::crates::proconio::input!{@from[&mut*locked_stdin]@rest$($rest)*}drop(locked_stdin);};}macro_rules!input{($($tt:tt)*)=>(crate::__cargo_equip_macro_def_proconio_input!{$($tt)*})}#[macro_export]macro_rules!__cargo_equip_macro_def_proconio_read_value{(@source[$source:expr]@kind[[$($kind:tt)*]])=>{$crate::__cargo_equip::crates::proconio::read_value!(@array@source[$source]@kind[]@rest$($kind)*)};(@array@source[$source:expr]@kind[$($kind:tt)*]@rest)=>{{let len=::read($source);$crate::__cargo_equip::crates::proconio::read_value!(@source[$source]@kind[[$($kind)*;len]])}};(@array@source[$source:expr]@kind[$($kind:tt)*]@rest;$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::read_value!(@array@source[$source]@kind[$($kind)*]@len[$($rest)*])};(@array@source[$source:expr]@kind[$($kind:tt)*]@rest$tt:tt$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::read_value!(@array@source[$source]@kind[$($kind)*$tt]@rest$($rest)*)};(@array@source[$source:expr]@kind[$($kind:tt)*]@len[$($len:tt)*])=>{{let len=$($len)*;(0..len).map(|_|$crate::__cargo_equip::crates::proconio::read_value!(@source[$source]@kind[$($kind)*])).collect::>()}};(@source[$source:expr]@kind[($($kinds:tt)*)])=>{$crate::__cargo_equip::crates::proconio::read_value!(@tuple@source[$source]@kinds[]@current[]@rest$($kinds)*)};(@tuple@source[$source:expr]@kinds[$([$($kind:tt)*])*]@current[]@rest)=>{($($crate::__cargo_equip::crates::proconio::read_value!(@source[$source]@kind[$($kind)*]),)*)};(@tuple@source[$source:expr]@kinds[$($kinds:tt)*]@current[$($curr:tt)*]@rest)=>{$crate::__cargo_equip::crates::proconio::read_value!(@tuple@source[$source]@kinds[$($kinds)*[$($curr)*]]@current[]@rest)};(@tuple@source[$source:expr]@kinds[$($kinds:tt)*]@current[$($curr:tt)*]@rest,$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::read_value!(@tuple@source[$source]@kinds[$($kinds)*[$($curr)*]]@current[]@rest$($rest)*)};(@tuple@source[$source:expr]@kinds[$($kinds:tt)*]@current[$($curr:tt)*]@rest$tt:tt$($rest:tt)*)=>{$crate::__cargo_equip::crates::proconio::read_value!(@tuple@source[$source]@kinds[$($kinds)*]@current[$($curr)*$tt]@rest$($rest)*)};(@source[$source:expr]@kind[])=>{compile_error!(concat!("Reached unreachable statement while parsing macro input. ","This is a bug in `proconio`. ","Please report this issue from ","."));};(@source[$source:expr]@kind[$kind:ty])=>{<$kind as$crate::__cargo_equip::crates::proconio::__Readable>::read($source)}}macro_rules!read_value{($($tt:tt)*)=>(crate::__cargo_equip_macro_def_proconio_read_value!{$($tt)*})}pub fn is_stdin_empty()->bool{use crate::__cargo_equip::crates::proconio::source::Source;let mut lock=STDIN_SOURCE.lock().expect(concat!("failed to lock the stdin; please re-run this program. ","If this issue repeatedly occur, this is a bug in `proconio`. ","Please report this issue from ","."));lock.is_empty()}} pub mod __proconio_derive_0_2_1 {pub use crate::__cargo_equip::macros::__proconio_derive_0_2_1::*;#[macro_export]macro_rules!__cargo_equip_macro_def___proconio_derive_0_2_1_derive_readable{($(_:tt)*)=>(::std::compile_error!("`derive_readable` from `proconio-derive 0.2.1` should have been expanded");)}#[macro_export]macro_rules!__cargo_equip_macro_def___proconio_derive_0_2_1_fastout{($(_:tt)*)=>(::std::compile_error!("`fastout` from `proconio-derive 0.2.1` should have been expanded");)}} pub mod strongly_connected_components {use crate::__cargo_equip::preludes::strongly_connected_components::*;use graph::Graph;pub fn strongly_connected_components(g:&Graph)->Graph,E>where V:Clone,E:Clone,{let n=g.size();let mut scc=Scc{comp:vec![0;n],low:vec![0;n],ord:vec![!0;n],vis:vec![],t:0,m:0,};for v in 0..n{if scc.ord[v]==!0{scc.dfs(v,g);}}let mut groups=vec![vec![];scc.m];for v in 0..n{scc.comp[v]=scc.m-1-scc.comp[v];groups[scc.comp[v]].push(v);}let mut res=Graph::from(groups);for v in 0..n{for(u,w)in g.out_edges(v){let a=scc.comp[v];let b=scc.comp[*u];if a!=b{res.add_edge(a,b,w.clone());}}}res}impl Scc{fn dfs(&mut self,v:usize,g:&Graph)where V:Clone,E:Clone,{self.low[v]=self.t;self.ord[v]=self.t;self.t+=1;self.vis.push(v);for&(u,_)in g.out_edges(v){if self.ord[u]==!0{self.dfs(u,g);self.low[v]=self.low[v].min(self.low[u]);}else{self.low[v]=self.low[v].min(self.ord[u]);}}if self.low[v]==self.ord[v]{loop{let u=self.vis.pop().unwrap();self.ord[u]=g.size();self.comp[u]=self.m;if u==v{break;}}self.m+=1;}}}struct Scc{comp:Vec,low:Vec,ord:Vec,vis:Vec,t:usize,m:usize,}} pub mod two_satisfiability {use crate::__cargo_equip::preludes::two_satisfiability::*;use graph::Graph;use strongly_connected_components::strongly_connected_components;pub struct TwoSatisfiability{n:usize,g:Graph<(),()>,}impl TwoSatisfiability{pub fn new(n:usize)->Self{Self{n,g:Graph::new(n*2),}}pub fn set(&mut self,x:usize){if xOption>{let scc=strongly_connected_components(&self.g);let mut comp=vec![0;self.n*2];for i in 0..scc.size(){for&x in&scc.vertices()[i]{comp[x]=i;}}let mut res=vec![false;self.n];for i in 0..self.n{if comp[i]==comp[i+self.n]{return None;}res[i]=comp[i]>comp[i+self.n];}Some(res)}fn id(&self,x:usize)->usize{assert!(x