Submission #173359

#	Time	Username	Problem	Language	Result	Execution time	Memory
173359		DeD_TihoN	Money (IZhO17_money)	C++14	100 / 100	1476 ms	199580 KiB

money

#pragma GCC optimize ("O3")
#include<bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define ll long long
#define ld long double
#define all(a) a.begin(),a.end()
#define ull unsigned long long
#define endl '\n'
#define y1 yaumru
#define ios ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define iter vector<int>::iterator
using namespace std;
using namespace __gnu_pbds;

template<class T>
using ordered_set=tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;

template<class T>
using ordered_multiset=tree<T,null_type,less_equal<T>,rb_tree_tag,tree_order_statistics_node_update>;

mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rnd1(chrono::steady_clock::now().time_since_epoch().count());

//find_by_order
//order_of_key

const int N=1e6+2;
const int inf=1e18+1e9;
const int mod=1e9+7;
const ld eps=1e-9;

int a[N];
char t[N*44];
int l3[N*44],r3[N*44];
int all=0;
int root[N];

inline int vcopy(const int& v)
{
    ++all;
    t[all]=t[v];
    l3[all]=l3[v];
    r3[all]=r3[v];
    return all;
}

char get(int v,int l1,int r1,const int& l2,const int& r2)
{
    if (l2>r2)return 0;
    if (l1>r2 || r1<l2){
        return 0;
    }
    if (l1>=l2 && r1<=r2){
        return t[v];
    }
    int mid=(l1+r1)/2;
    if (!(mid<l2)){
        if (get(l3[v],l1,mid,l2,r2)){
            return 1;
        }
    }
    if (!(mid+1>r2)){
        if (get(r3[v],mid+1,r1,l2,r2)){
            return 1;
        }
    }
    return 0;
}

void update(int v,int l1,int r1,const int& pos)
{
    if (l1==r1){
        t[v]=1;
        return;
    }
    int mid=(l1+r1)/2;
    if (pos<=mid){
        l3[v]=vcopy(l3[v]);
        update(l3[v],l1,mid,pos);
    }
    else {
        r3[v]=vcopy(r3[v]);
        update(r3[v],mid+1,r1,pos);
    }
    t[v]=(t[l3[v]]|t[r3[v]]);
}

main ()
{
    ios;
    int n;
    cin>>n;
    for (int i=1;i<=n;++i){
        cin>>a[i];
    }
    root[0]=vcopy(root[0]);
    for (int i=1;i<=n;++i){
        root[i]=vcopy(root[i-1]);
        update(root[i],1,(int)1e6,a[i]);
    }
    int ans=0;
    for (int i=n;i>=1;--i){
        int r=i-1;
        while(r>=1 && a[r]<=a[r+1]){
            char cc=true;
            if (get(root[r-1],1,(int)1e6,a[r]+1,a[i]-1)>0){
                cc=false;
            }
            if (!cc){
                break;
            }
            --r;
        }
        i=r+1;
        ++ans;
    }
    cout<<ans<<endl;
}

Compilation message (stderr)

money.cpp:33:19: warning: overflow in implicit constant conversion [-Woverflow]
 const int inf=1e18+1e9;
               ~~~~^~~~
money.cpp:93:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main ()
       ^

• Subtask 1: 9 / 9
• Subtask 2: 16 / 16
• Subtask 3: 20 / 20
• Subtask 4: 55 / 55