Submission #1325176

#	Time	Username	Problem	Language	Result	Execution time	Memory
1325176		bw_isamu	Mountains (NOI20_mountains)	C++20	0 / 100	2 ms	568 KiB

Mountains

#include <bits/stdc++.h>
using namespace std;
int N = 33333;
vector<int> a(N);
int checkr(int k, int b){
    int right = 0;
    for(int i = k + 1; i < b; i++){
        if(a[i] < a[k]){
            right++;
        }
    }
    return right++;
}
int checkl(int k){
    int left = 0;
    for(int i = 0; i < k; i++){
        if(a[i] < a[k]){
            left++;
        }
    }
    return left;
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int ans = 0;
    for(int k = 1; k < n - 1; k++){
        ans += checkl(k) * checkr(k, n);
    }
    cout << ans << endl;
    return 0;
}

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