Submission #887063

#	Time	Username	Problem	Language	Result	Execution time	Memory
887063		ByeWorld	Art Exhibition (JOI18_art)	C++14	100 / 100	139 ms	29088 KiB

art

#include <bits/stdc++.h>
#pragma GCC optimize("Ofast,unroll-loops")
#define bupol __builtin_popcount
#define int long long 
#define ll long long
#define ld long double
#define fi first
#define se second
#define pb push_back
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
using namespace std;
const int MAXN = 5e5+20;
const int LOG = 20;
const int MOD = 1e9+7;
const int SQRT = 520;
const int INF = 1e18;
typedef pair<int,int> pii;
typedef pair<int,pii> ipii;

int n;
vector <pii> vec;
int a[MAXN], mx[MAXN];

signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n;
    for(int i=1; i<=n; i++){
        int x, y; cin >> x >> y;
        vec.pb({x, y});
    }
    vec.pb({-1, -1});
    sort(vec.begin(), vec.end());

    a[1] = vec[1].se;
    for(int i=2; i<=n; i++){
        a[i] = a[i-1];
        a[i] += vec[i].se; a[i] -= vec[i].fi-vec[i-1].fi; 
        //cout << i << ' ' << a[i] << " te\n";
    }
    mx[n+1] = -INF;
    for(int i=n; i>=1; i--) mx[i] = max(mx[i+1], a[i]);

    int ans = 0, te = 0;
    for(int i=1; i<=n; i++){
        //cout << i << ' ' << mx[i] << ' ' << te << " te\n";
        ans = max(ans, mx[i]+te);
        te -= vec[i].se; te += vec[i+1].fi-vec[i].fi;
    }
    cout << ans << '\n';
}

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