Submission #875953

#	Time	Username	Problem	Language	Result	Execution time	Memory
875953		misu2005	Art Exhibition (JOI18_art)	C++11	100 / 100	432 ms	20772 KiB

art

#include <iostream>
#include <algorithm>
#include <climits>

using namespace std;

struct ceva {
    long long sz, val;
} v[500002];

bool cmp(ceva x, ceva y) {
    return x.sz < y.sz;
}

long long n;
long long sp[500002], tree[2000005];

void build(long long node, long long st, long long dr) {
    if (st == dr) {
        tree[node] = sp[st] - v[st].sz;
        return ;
    }

    long long mij = (st + dr)/2;
    build(2*node, st, mij);
    build(2*node+1, mij+1, dr);
    tree[node] = max(tree[2*node], tree[2*node+1]);
}

long long query(long long node, long long st, long long dr, long long left, long long right) {
    if (left <= st and dr <= right) {
        return tree[node];
    }

    long long mij = (st + dr)/2;
    long long ans1 = LLONG_MIN, ans2 = LLONG_MIN;
    if (left <= mij)
        ans1 = query(2*node, st, mij, left, right);
    if (mij < right)
        ans2 = query(2*node+1, mij+1, dr, left, right);
    return max(ans1, ans2);
}

signed main()
{
    cin >> n;
    for (long long i = 1; i <= n; i++) {
        cin >> v[i].sz >> v[i].val;
    }
    sort(v+1, v+n+1, cmp);
    for (long long i = 1; i <= n; i++) {
        sp[i] = sp[i-1] + v[i].val;
    }

    build(1, 1, n);

    long long maxim = LLONG_MIN;
    for (long long i = 1; i <= n; i++) {
        long long  x = sp[i-1] - v[i].sz;
        long long rezdr = query(1, 1, n, i, n);
        maxim = max(maxim, rezdr-x);
    }
    cout << maxim;
    return 0;
}

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