Submission #197868

#	Time	Username	Problem	Language	Result	Execution time	Memory
197868		DS007	Art Exhibition (JOI18_art)	C++14	100 / 100	261 ms	28792 KiB

art

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

#define x first
#define y second

signed main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);

    int n;
    cin >> n;

    pair<long long, long long> a[n];
    for (int i = 0; i < n; i++) cin >> a[i].x >> a[i].y;
    sort(a, a + n);

    long long dp1[n], dp2[n];
    fill(dp1, dp1 + n, 0);
    fill(dp2, dp2 + n, 0);

    dp1[0] = a[0].x + a[0].y;
    for (int i = 1; i < n; i++) dp1[i] = max(dp1[i - 1] + a[i].y, a[i].x + a[i].y);

    dp2[n - 1] = a[n - 1].y - a[n - 1].x;
    for (int i = n - 2; i >= 0; i--) dp2[i] = max(dp2[i + 1] + a[i].y, a[i].y - a[i].x);

    long long ans = 0;
    for (int i = 0; i < n; i++) ans = max(ans, a[i].y);
    for (int i = 0; i < n - 1; i++) ans = max(ans, dp1[i] + dp2[i + 1]);
    cout << ans;
}

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50