Submission #1033853

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033853		vjudge1	Art Exhibition (JOI18_art)	C++17	100 / 100	136 ms	19412 KiB

art

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#define int long long
// #define double long double
 
#define endl '\n'
#define fastIO ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
#define setmin(x, y) x = min((x), (y))
#define setmax(x, y) x = max((x), (y))
#define sqr(x) ((x) * (x))
#define fi first
#define se second
#define all(x) x.begin(), x.end()
 
// mt19937 hdp(chrono::high_resolution_clock::now().time_since_epoch().count());
// int rand(int l, int r){return l + ((hdp() % (r - l + 1)) + r - l + 1) % (r - l + 1);}

const int NM = 5e5 + 5;
const int mod =  1e9 + 7;

int n, mx, p[NM], ans;
pair<int, int> a[NM];

signed main()
{
    fastIO
    if (fopen("in.txt", "r")) 
    {
        freopen("in.txt", "r", stdin);
        freopen("out.txt", "w", stdout);
    }
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i].fi >> a[i].se;
    sort(a + 1, a + 1 + n);
    for (int i = 1; i <= n; i++)
        p[i] = p[i - 1] + a[i].se;
    for (int i = 1; i <= n; i++)
    {
        setmax(mx, -p[i - 1] + a[i].fi);
        setmax(ans, p[i] - a[i].fi + mx);
    }
    cout << ans;
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:31:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |         freopen("in.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
art.cpp:32:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen("out.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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