Submission #1155745

#	Time	Username	Problem	Language	Result	Execution time	Memory
1155745		dosts	Money (IZhO17_money)	C++20	100 / 100	121 ms	23880 KiB

money

#include <bits/stdc++.h>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2")
using namespace std;
#define int long long
#define pii pair<int,int>
#define ff first
#define ss second
#define sp << " " <<    
#define all(cont) cont.begin(),cont.end()
#define vi vector<int>

const int inf = 1e18,N = 3e3+1,MOD =  998244353;
struct FT {
    vi bit;
    int n;
    int sz = 0;
    FT(int nn) {
        n = nn;
        bit.assign(nn+1,0);
    }

    void put(int p,int v) {
        sz+=v;
        for (int i = p;i<=n;i+=i&-i) bit[i]+=v;
    }

    int get(int p) {
        int ans = 0;
        for (int i = p;i>0;i-=i&-i) ans+=bit[i];
        return ans;
    }
    int get(int l,int r) {
        if (l > r) return 0;
        return get(r)-get(l-1);
    }
} ft(1000000);
void solve() {  
    int n;
    cin >> n;
    vi a(n+1);
    for (int i=1;i<=n;i++) cin >> a[i];
    int srtd[n+1];
    srtd[n] = n;
    for (int i = n-1;i>=1;i--) {
        srtd[i] = ((a[i] <= a[i+1])?(srtd[i+1]):(i));
    }
    int ans = 0;
    for (int i=1;i<=n;) {
        ans++;
        int l = i;
        int r = srtd[i];
        while (l<=r) {
            int m = (l+r) >> 1;
            int L = a[i],R = a[m];
            if (ft.get(L+1,R-1)) r = m-1;
            else l = m+1;
        }
        for (int j = i;j<=r;j++) ft.put(a[j],1);
        i = r+1;
    }
    cout << ans << '\n';
}


int32_t main() { 
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    #ifdef Dodi 
        freopen("in.txt","r",stdin);
        freopen("out.txt","w",stdout);
    #endif
    int t = 1;
    //cin >> t;
    while (t --> 0) solve();
}

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