Submission #1303950

#	Time	Username	Problem	Language	Result	Execution time	Memory
1303950		duchieulc	Money (IZhO17_money)	C++20	0 / 100	1 ms	572 KiB

money

#include <bits/stdc++.h>
#define TIME (1.0 * clock() / CLOCKS_PER_SEC)
#define F first
#define S second
#define pb push_back

using namespace std;
typedef long long ll;
typedef pair<ll,ll> pll;
const ll MAX = 1e6+7;
const ll MOD = 1e9+7;

ll n,a[MAX], id[MAX];
vector <pll> v;
void solve() {  
    cin >> n;
    for(ll i=1; i<=n; ++i)  cin >> a[i];
    ll type = 1, ans = 0;
    set <ll> s;
    for(ll i=1; i<=n; ++i) {
        type += (a[i] < a[i-1]);
        auto r = s.upper_bound(a[i]);
        if(r == s.begin()) {
            if(id[*r] != type) ans ++;
        }
        else if(r == s.end()) {
            auto l = --r;
            if(id[*l] != type)  ans ++;
        }
        else {
            auto l = --r;
            if(id[*l] != type && id[*r] != type)
                ans ++;
        }
        s.insert(a[i]);
        id[a[i]] = type;
        // cout << ans << " ";
    }
    cout << ans;
}

signed main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    //if(fopen("TASK.INP","r")) {
    //    freopen("TASK.INP","r",stdin);
    //    freopen("TASK.OUT","w",stdout);
    //}
    solve();
    cerr << "\n" << "Time elapsed: " << TIME << "s\n";
    return 0;
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55