Submission #1191056

#	Time	Username	Problem	Language	Result	Execution time	Memory
1191056		Cebrayil09	Mountains (NOI20_mountains)	C++20	36 / 100	2094 ms	3424 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;

#define pii pair < int , int >
#define eb emplace_back
#define pb push_back
#define int long long
#define fi first
#define se second

const int inf = 1e18;

void solve() {
    int n; cin >> n;
    vector<int> v(n+1);

    for(int i = 1;i <= n;i++) cin >> v[i];


    vector<pii> a;
    a.eb(v[1], 0);

    int ans = 0;
    for(int i = 2;i <= n;i++) {
        int res = 0;

        int l = 0 , r = a.size()-1, in = -1;
        while(l <= r) {
            int mid = l + (r-l)/2;

            if(a[mid].fi > v[i]) {
                in = mid;
                r = mid-1;
            }
            else l = mid+1;
        }

        if(in != -1) {
            for(int j = in;j < a.size();j++) {
                ans += a[j].se;
            }
        }

        l = 0, r = a.size()-1, in = -1;
        while(l <= r) {
            int mid = l + (r-l)/2;

            if(a[mid].fi < v[i]) {
                in = mid;
                l = mid+1;
            }
            else r = mid-1;
        }

        a.eb(v[i], in+1);
        sort(a.begin(), a.end());
    }

    cout << ans << "\n";
}

signed main() {
    ios_base::sync_with_stdio(0);
    cout.tie(0);

    int t = 1; //cin >> t;
    while(t--) solve();
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 36 / 36
• Subtask 5: 0 / 28
• Subtask 6: 0 / 9
• Subtask 7: 0 / 12