segment_tree/test/AOJ_dual_segment_tree.test.cpp

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Last update: 2021-01-30 10:06:08+09:00
Problem: http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D

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Code

#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D"
#include "../dual_segment_tree.hpp"
#include "../../functional/update.hpp"
#include "../../util/template.hpp"

int main(){
    lint n,q;
    cin>>n>>q;
    dual_segment_tree<lint,update<lint>>seg(n);
    while(q--){
        lint c;
        cin>>c;
        if(c==0){
            lint s,t,u;
            cin>>s>>t>>u;
            seg.update(s,t+1,u);
        }else{
            lint x;
            cin>>x;
            cout<<seg.get(x).unwrap_or((1LL<<31)-1)<<endl;
        }
    }
}

#line 1 "segment_tree/test/AOJ_dual_segment_tree.test.cpp"
#define PROBLEM "http://judge.u-aizu.ac.jp/onlinejudge/description.jsp?id=DSL_2_D"
#line 2 "alga/maybe.hpp"
#include<cassert>

/**
 * @brief Maybe
 * @see https://ja.wikipedia.org/wiki/%E3%83%A2%E3%83%8A%E3%83%89_(%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0)#Maybe%E3%83%A2%E3%83%8A%E3%83%89
 */

template<typename T>
struct maybe{
    bool _is_none;
    T val;
    maybe():_is_none(true){}
    maybe(T val):_is_none(false),val(val){}
    T unwrap()const{
        assert(!_is_none);
        return val;
    }
    T unwrap_or(T e)const{
        return _is_none?e:val;
    }
    bool is_none()const{return _is_none;}
    bool is_some()const{return !_is_none;}
};

template<typename T,typename F>
auto expand(F op){
    return [&op](const maybe<T>& s,const maybe<T>& t){
        if(s.is_none())return t;
        if(t.is_none())return s;
        return maybe<T>(op(s.unwrap(),t.unwrap()));
    };
}
#line 3 "segment_tree/dual_segment_tree.hpp"

/**
 * @brief 双対セグメント木
 */

template<typename T,typename F>
class dual_segment_tree{
	struct node;
	using np=node*;
	using i64=long long;
	struct node{
		maybe<T> val;
		np ch[2]={nullptr,nullptr};
		node(maybe<T> val=maybe<T>()):val(val){}
	};
	np root=nullptr;
	i64 n=1,sz;
    F op;
	public:
	dual_segment_tree(i64 sz,F op=F()):sz(sz),op(op){while(n<sz)n<<=1;}
	inline void update(i64 l,i64 r,T x){update(l,r,x,0,n,root);}
	inline maybe<T> get(i64 x){return get(x,0,n,root);}
	private:
	void eval(np& t){
        auto f=expand<T,F>(op);
		if(t->val.is_none())return;
		if(!t->ch[0])t->ch[0]=new node();
		if(!t->ch[1])t->ch[1]=new node();
		t->ch[0]->val=f(t->ch[0]->val,t->val);
		t->ch[1]->val=f(t->ch[1]->val,t->val);
		t->val=maybe<T>();
	}
	void update(i64 a,i64 b,T x,i64 l,i64 r,np& t){
        auto f=expand<T,F>(op);
        if(!t)t=new node();
		if(r-l>1)eval(t);
		if(r<=a||b<=l)return;
		else if(a<=l&&r<=b)t->val=f(t->val,x);
	    else if(r-l>1){
			update(a,b,x,l,(l+r)/2,t->ch[0]);
			update(a,b,x,(l+r)/2,r,t->ch[1]);
		}
	}
	maybe<T> get(i64 x,i64 l,i64 r,np& t){
        auto f=expand<T,F>(op);
        if(!t)t=new node();
		if(r-l>1)eval(t);
		if(x<l||r<=x)return maybe<T>();
        else if(r-l==1){
            return t->val;
        }
		else return f(get(x,l,(l+r)/2,t->ch[0]),get(x,(l+r)/2,r,t->ch[1]));
	}
};
#line 2 "functional/update.hpp"

/**
 * @brief 更新
 */

template<typename T>
struct update{
    T operator()(const T& s,const T& t){
        return t;
    }
};
#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 5 "segment_tree/test/AOJ_dual_segment_tree.test.cpp"

int main(){
    lint n,q;
    cin>>n>>q;
    dual_segment_tree<lint,update<lint>>seg(n);
    while(q--){
        lint c;
        cin>>c;
        if(c==0){
            lint s,t,u;
            cin>>s>>t>>u;
            seg.update(s,t+1,u);
        }else{
            lint x;
            cin>>x;
            cout<<seg.get(x).unwrap_or((1LL<<31)-1)<<endl;
        }
    }
}