Submission #974684

#	Time	Username	Problem	Language	Result	Execution time	Memory
974684		alextodoran	Real Mountains (CCO23_day1problem2)	C++17	0 / 25	1 ms	2396 KiB

Main

/**
 _  _   __  _ _ _  _  _ _
 |a  ||t  ||o    d | |o  |
| __    _| | _ | __|  _ |
| __ |/_  | __  /__\ / _\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N_MAX = 1000000;

int N;
int A[N_MAX + 2];

int cost[N_MAX + 2];

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    cin >> N;
    for (int i = 1; i <= N; i++) {
        cin >> A[i];
    }
    set <int> s; s.insert(INT_MAX);
    for (int i = 1; i <= N; i++) {
        cost[i] += *s.upper_bound(A[i]);
        s.insert(A[i]);
    }
    s.clear(); s.insert(INT_MAX / 3);
    for (int i = N; i >= 1; i--) {
        cost[i] += *s.upper_bound(A[i]);
        s.insert(A[i]);
    }
    ll answer = 0;
    for (int i = 2; i <= N - 1; i++) {
        int mn = min(A[i - 1], A[i + 1]);
        if (A[i] < mn) {
            answer += (ll) cost[i] * (mn - A[i]);
            answer += (ll) mn * (mn - 1) / 2 - (ll) A[i] * (A[i] - 1) / 2;
        }
    }
    cout << answer << "\n";

    return 0;
}

• Subtask 1: 0 / 3
• Subtask 2: 0 / 3
• Subtask 3: 0 / 3
• Subtask 4: 0 / 3
• Subtask 5: 0 / 4
• Subtask 6: 0 / 5
• Subtask 7: 0 / 4