:heavy_check_mark: data_structure/test/LC_cartesian_tree.test.cpp

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Code

#define PROBLEM "https://judge.yosupo.jp/problem/cartesian_tree"
#include "../cartesian_tree.hpp"
#include "../../util/template.hpp"

int main(){
	lint n;
	cin>>n;
	vec a(n);
	rep(i,n)cin>>a[i];
	cartesian_tree<lint>ct(a);
	output(ct.get());
}
#line 1 "data_structure/test/LC_cartesian_tree.test.cpp"
#define PROBLEM "https://judge.yosupo.jp/problem/cartesian_tree"
#line 2 "data_structure/cartesian_tree.hpp"
#include<vector>
#include<stack>
#include<cstdint>
#include<functional>

/**
 * @brief cartesian_tree
 */

template<typename T,typename F=std::less<T>>
struct cartesian_tree{
    struct node;
    using np=node*;
    struct node{
        np ch[2]={0,0};
        T val;
        int pos;
        int sz=0;
        node(T val,int pos):val(val),pos(pos){}
    };
    int size(np t){return t?t->sz:0;}
    np update(np t){}
    np root=0;
    int sz=0;
    F comp;
    cartesian_tree(std::vector<T>v,F comp):comp(comp){
        for(auto e:v)push_back(e);
    }
    cartesian_tree(std::vector<T>v):comp(F()){
        for(auto e:v)push_back(e);
    }
    cartesian_tree(F comp):comp(comp){}
    cartesian_tree():comp(F()){}

    void push_back(int val){
        static std::stack<np>stk;
        while(!stk.empty()&&comp(val,stk.top()->val))stk.pop();
        np t=new node(val,sz);
        if(stk.empty()){
            t->ch[0]=root;
            root=t;
        }else{
            t->ch[0]=stk.top()->ch[1];
            stk.top()->ch[1]=t;
        }
        stk.emplace(t);
        sz++;
    }
    std::int64_t update_size(np t){
        if(!t)return 0;
        return t->sz=update_size(t->ch[0])+1+update_size(t->ch[1]);
    }
    std::vector<T>get(){
		std::vector<T>v(sz);
		auto f=[&](auto f,np t){
			if(!t)return;
			f(f,t->ch[0]);
			if(t->ch[0])v[t->ch[0]->pos]=t->pos;
			if(t->ch[1])v[t->ch[1]->pos]=t->pos;
			f(f,t->ch[1]);
		};
		v[root->pos]=root->pos;
		f(f,root);
		return v;
	}
};
#line 2 "util/template.hpp"
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#pragma GCC target("avx2")
#include<bits/stdc++.h>
using namespace std;
struct __INIT__{__INIT__(){cin.tie(0);ios::sync_with_stdio(false);cout<<fixed<<setprecision(15);}}__INIT__;
typedef long long lint;
#define INF (1LL<<60)
#define IINF (1<<30)
#define EPS (1e-10)
#define endl ('\n')
typedef vector<lint> vec;
typedef vector<vector<lint>> mat;
typedef vector<vector<vector<lint>>> mat3;
typedef vector<string> svec;
typedef vector<vector<string>> smat;
template<typename T>using V=vector<T>;
template<typename T>using VV=V<V<T>>;
template<typename T>inline void output(T t){bool f=0;for(auto i:t){cout<<(f?" ":"")<<i;f=1;}cout<<endl;}
template<typename T>inline void output2(T t){for(auto i:t)output(i);}
template<typename T>inline void debug(T t){bool f=0;for(auto i:t){cerr<<(f?" ":"")<<i;f=1;}cerr<<endl;}
template<typename T>inline void debug2(T t){for(auto i:t)output(i);}
#define loop(n) for(long long _=0;_<(long long)(n);++_)
#define _overload4(_1,_2,_3,_4,name,...) name
#define __rep(i,a) repi(i,0,a,1)
#define _rep(i,a,b) repi(i,a,b,1)
#define repi(i,a,b,c) for(long long i=(long long)(a);i<(long long)(b);i+=c)
#define rep(...) _overload4(__VA_ARGS__,repi,_rep,__rep)(__VA_ARGS__)
#define _overload3_rev(_1,_2,_3,name,...) name
#define _rep_rev(i,a) repi_rev(i,0,a)
#define repi_rev(i,a,b) for(long long i=(long long)(b)-1;i>=(long long)(a);--i)
#define rrep(...) _overload3_rev(__VA_ARGS__,repi_rev,_rep_rev)(__VA_ARGS__)

// #define rep(i,...) for(auto i:range(__VA_ARGS__)) 
// #define rrep(i,...) for(auto i:reversed(range(__VA_ARGS__)))
// #define repi(i,a,b) for(lint i=lint(a);i<(lint)(b);++i)
// #define rrepi(i,a,b) for(lint i=lint(b)-1;i>=lint(a);--i)
// #define irep(i) for(lint i=0;;++i)
// inline vector<long long> range(long long n){if(n<=0)return vector<long long>();vector<long long>v(n);iota(v.begin(),v.end(),0LL);return v;}
// inline vector<long long> range(long long a,long long b){if(b<=a)return vector<long long>();vector<long long>v(b-a);iota(v.begin(),v.end(),a);return v;}
// inline vector<long long> range(long long a,long long b,long long c){if((b-a+c-1)/c<=0)return vector<long long>();vector<long long>v((b-a+c-1)/c);for(int i=0;i<(int)v.size();++i)v[i]=i?v[i-1]+c:a;return v;}
// template<typename T>inline T reversed(T v){reverse(v.begin(),v.end());return v;}
#define all(n) begin(n),end(n)
template<typename T,typename E>bool chmin(T& s,const E& t){bool res=s>t;s=min<T>(s,t);return res;}
template<typename T,typename E>bool chmax(T& s,const E& t){bool res=s<t;s=max<T>(s,t);return res;}
const vector<lint> dx={1,0,-1,0,1,1,-1,-1};
const vector<lint> dy={0,1,0,-1,1,-1,1,-1};
#define SUM(v) accumulate(all(v),0LL)
template<typename T,typename ...Args>auto make_vector(T x,int arg,Args ...args){if constexpr(sizeof...(args)==0)return vector<T>(arg,x);else return vector(arg,make_vector<T>(x,args...));}
#define extrep(v,...) for(auto v:__MAKE_MAT__({__VA_ARGS__}))
#define bit(n,a) ((n>>a)&1)
vector<vector<long long>> __MAKE_MAT__(vector<long long> v){if(v.empty())return vector<vector<long long>>(1,vector<long long>());long long n=v.back();v.pop_back();vector<vector<long long>> ret;vector<vector<long long>> tmp=__MAKE_MAT__(v);for(auto e:tmp)for(long long i=0;i<n;++i){ret.push_back(e);ret.back().push_back(i);}return ret;}
using graph=vector<vector<int>>;
template<typename T>using graph_w=vector<vector<pair<int,T>>>;
template<typename T,typename E>ostream& operator<<(ostream& out,pair<T,E>v){out<<"("<<v.first<<","<<v.second<<")";return out;}
constexpr inline long long powll(long long a,long long b){long long res=1;while(b--)res*=a;return res;}
#line 4 "data_structure/test/LC_cartesian_tree.test.cpp"

int main(){
	lint n;
	cin>>n;
	vec a(n);
	rep(i,n)cin>>a[i];
	cartesian_tree<lint>ct(a);
	output(ct.get());
}
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