Submission #1197587

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197587		primo	Seesaw (JOI22_seesaw)	C++20	0 / 100	1 ms	324 KiB

seesaw

#include <bits/stdc++.h>
#define int long long

using namespace std;

int32_t main() {
    ios_base::sync_with_stdio(0);
    cin.tie(nullptr);
    
    int n;
    cin >> n;

    long double sum = 0, st = 0;
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
        sum += a[i];
    }

    st = sum / n;
    int l = 0, r = n - 1;
    long double lv = st, rv = st;
    while (l < r) {
        long double cur = sum / (r - l + 1);
        if (st <= cur) {
            sum -= a[r--];
        } else {
            sum -= a[l++];
        }

        cur = sum / (r - l + 1);
        lv = min(lv, cur);
        rv = max(rv, cur);
    }

    cout << fixed << setprecision(10);
    cout << rv - lv << "\n";

    return 0;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 33
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33