Submission #835130

#TimeUsernameProblemLanguageResultExecution timeMemory
835130gagik_2007Radio Towers (IOI22_towers)C++17
23 / 100
4093 ms12144 KiB
#include "towers.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define ff first
#define ss second

ll ttt;
const ll INF=1e18;
const ll MOD=1e9+7;
const ll N=100007;
ll n,m,k;
vector<int>a;
struct Node{
    int mx;
    int mxind;
    int mn;
    int mnind;
    Node():mx(0),mn(0),mxind(0),mnind(0){}
    void bld(int vl, int ind){
        mx=mn=vl;
        mxind=mnind=ind;
    }
    void join(const Node& lft, const Node& rgh){
        if(lft.mx>=rgh.mx){
            mx=lft.mx;
            mxind=lft.mxind;
        }
        else{
            mx=rgh.mx;
            mxind=rgh.mxind;
        }
        if(lft.mn<=rgh.mn){
            mn=lft.mn;
            mnind=lft.mnind;
        }
        else{
            mn=rgh.mn;
            mnind=rgh.mnind;
        }
    }
};
Node t[4*N];

void build(int v, int tl, int tr){
    if(tl==tr){
        t[v].bld(a[tl], tl);
    }
    else{
        int tm=(tl+tr)/2;
        build(2*v,tl,tm);
        build(2*v+1,tm+1,tr);
        t[v].join(t[2*v],t[2*v+1]);
    }
}

pair<int,int> get_max(int v, int tl, int tr, int l, int r){
    if(l>r)return {0,0};
    if(tl==l&&tr==r)return {t[v].mx, t[v].mxind};
    else{
        int tm=(tl+tr)/2;
        return max(get_max(2*v,tl,tm,l,min(tm,r)),
            get_max(2*v+1,tm+1,tr,max(tm+1,l),r));
    }
}

pair<int,int> get_min(int v, int tl, int tr, int l, int r){
    if(l>r)return {MOD,MOD};
    if(tl==l&&tr==r)return {t[v].mn,t[v].mnind};
    else{
        int tm=(tl+tr)/2;
        return min(get_min(2*v,tl,tm,l,min(tm,r)),
            get_min(2*v+1,tm+1,tr,max(tm+1,l),r));
    }
}

int recurs(int l, int r, int vl, int d){
    if(l>r)return 0;
    int mx=get_max(1,0,n-1,l,r).ss,
        mn=get_min(1,0,n-1,l,r).ss;
    if(a[mn]>vl-d)return 0;
    int lft=recurs(l,mx-1,a[mx],d);
    int rgh=recurs(mx+1,r,a[mx],d);
    // cout<<l<<" "<<r<<" "<<vl<<" "<<d<<": ";
    // cout<<a[mn]<<", "<<a[mx]<<", ";
    if(lft==0&&rgh==0){
        // cout<<1<<endl;
        return 1;
    }
    // cout<<lft+rgh<<endl;
    return lft+rgh;
}

void init(int NN, vector<int> H) {
    n=NN;
    a=H;
    build(1,0,n-1);
}

int max_towers(int L, int R, int D) {
    return recurs(L,R,2e9+7,D);
}

Compilation message (stderr)

towers.cpp: In constructor 'Node::Node()':
towers.cpp:22:9: warning: 'Node::mn' will be initialized after [-Wreorder]
   22 |     int mn;
      |         ^~
towers.cpp:21:9: warning:   'int Node::mxind' [-Wreorder]
   21 |     int mxind;
      |         ^~~~~
towers.cpp:24:5: warning:   when initialized here [-Wreorder]
   24 |     Node():mx(0),mn(0),mxind(0),mnind(0){}
      |     ^~~~
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