제출 #1117947

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1117947		Icelast	Money (IZhO17_money)	C++17	100 / 100	790 ms	61988 KiB

money

#include <iostream>
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const ll maxn = 2*1e5+5, INF = 1e9+9;
void solve(){
    int n;
    cin >> n;
    vector<int> a(n+1);
    for(int i = 1; i <= n; i++){
        cin >> a[i];
    }
    vector<int> f(n+1, INF);
    f[0] = 0;
    int last = 0;
    a[0] = INF;
    set<int> s;
    for(int i = 1; i <= n; i++){
        if(a[i] >= a[i-1]){
            auto it = s.lower_bound(a[i]);
            int L;
            if(it != s.begin()){
                L = *prev(it);
            }else{
                L = 0;
            }
            int l = last, r = i;
            while(l <= r){
                int mid = (l+r)/2;
                if(a[mid] >= L){
                    r = mid-1;
                }else{
                    l = mid+1;
                }
            }
            if(a[l] < L){
                f[i] = INF;
                continue;
            }
            f[i] = f[l-1]+1;
        }else{
            for(int j = last; j < i; j++){
                s.insert(a[j]);
            }
            last = i;
            f[i] = f[i-1]+1;
        }
    }
    cout << f[n];
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    solve();
}

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