Submission #137483

#	Time	Username	Problem	Language	Result	Execution time	Memory
137483		silxikys	Hacker (BOI15_hac)	C++14	60 / 100	60 ms	10360 KiB

hac

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

const int maxn = 5e5+5;
int n;
int v[2*maxn];
int pre[2*maxn];

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> v[i];
        v[i+n] = v[i];
    }
    pre[0] = v[0];
    for (int i = 1; i < 2*n; i++) {
        pre[i] = pre[i-1] + v[i];
    }
    int total = pre[n-1];
    if (n <= 5000) {
        int res = 0;
        for (int i = 0; i < n; i++) {
            int maxSum = 0;
            for (int j = i+n/2; j < i+n; j++) {
                maxSum = max(maxSum,pre[j]-pre[j-n/2]);
            }
            res = max(res,total-maxSum);
        }
        cout << res << '\n';
    }
    else {
        int res = 0;
        for (int i = 0; i < 1; i++) {
            int maxSum = 0;
            for (int j = i+n/2; j < i+n; j++) {
                maxSum = max(maxSum,pre[j]-pre[j-n/2]);
            }
            res = max(res,total-maxSum);
        }
        cout << res << '\n';
    }
}

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 40