Submission #479737

#	Time	Username	Problem	Language	Result	Execution time	Memory
479737		chungdinh	Art Exhibition (JOI18_art)	C++17	100 / 100	604 ms	12100 KiB

art

#include <iostream>
#include <vector>
#include <bitset>
#include <queue>
#include <algorithm>
#include <cstring>
#include <cmath>
#include <stack>
#include <set>
#include <map>
#include <cassert>
#include <bits/stdc++.h>

using namespace std;

#define pb push_back

#define ll long long
#define ii pair<long long int, long long int>
#define pll pair<long long, long long>
#define fi first
#define se second
#define r first
#define c second

#define all(x) x.begin(), x.end()
#define mk(x, y) make_pair(x, y)

ostream& operator << (ostream& os, pair<int, int> a) {
    return os << a.first << " : " << a.second;
}

#define endl '\n'
#define db(val) "["#val" = "<<(val)<<"] "
#define cntbit(x) __builtin_popcount(x)

const int N = 5e5 + 5;
const int iINF = 1e9;
const ll MOD = 1e9 + 7;
const ll MOD2 = 998244353;
const ll INF = 1e18;

int n;
ii a[N];

ll dp[N];

int main() {
    ios_base::sync_with_stdio();
    #ifdef CHUNGDINH
    freopen("main.inp","r",stdin);
    freopen("main.out","w",stderr);
    #endif

    cin >> n;
    for (int i = 1; i <= n; i++) cin >> a[i].first >> a[i].second;
    sort(a + 1, a + n + 1);

    ll ff = -INF;
    for (int i = 1; i <= n; i++) {
        dp[i] = a[i].second;
        dp[i] = max(dp[i], ff + a[i].second - a[i].first);
        ff = max(ff, dp[i] + a[i].first);
    }

    cout << *max_element(dp + 1, dp + n + 1);
}

/*
Array bounds *
long long vs int
Garbage value
Sometimes, VNOI views "arrays out of bounds" as "wrong answer"
*/

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