Submission #1049925

#	Time	Username	Problem	Language	Result	Execution time	Memory
1049925		vjudge1	Art Exhibition (JOI18_art)	C++17	0 / 100	1 ms	348 KiB

art

/*
Author: ArifKraw
Rating: 1379
Goal#1: Beat I_Love_Trott ))))
Goal#2: Not to allow FractalFrog beat myself
*/
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define pf push_front
#define ppf pop_front
#define ppb pop_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define ll long long
#define ld long double
#define nl '\n'
const ll N = 5e5 + 7;
const ll mod = 1e9 + 7;
const ll inf = 1e18;
const ld pi = 3.141592653589793;
const ld eps = 1e-12;
const ll zero = 0;
const int MAX = 1e6+5;
const int A = 1e9 + 5;
/*if you cant solve the problem:
try optimized(clever) brute-force;
try prefix sums with/or binary search
try dp
try dfs
try to solve in reversed orderr
try math
try to sort(sort(a+1,a+1+n)
int overflow, array bounds
think about special cases( n=1?)
*/
ll xx1[8]={0, 0,-1, 1, 1,-1, 1,-1};
ll xx2[8]={1,-1, 0, 0, 1, 1,-1,-1};

pair<ll,ll> a[N];
void egoist(){
	ll n;
    cin>>n;
    for(int i=1;i<=n;i++){
        cin>>a[i].ff>>a[i].ss;
    }
    sort(a+1,a+n+1);
    ll mx=0;
    ll val=0,pos2=0,val2=0;
    for(int i=1;i<=n;i++){
        val=a[i].ff;
        val2-=a[i-1].ss;
        while(pos2<i){
            val2+=a[pos2+1].ss;
            pos2++;
        }
        //
        while(pos2<n){
            if(val+val2+a[pos2+1].ss-a[pos2+1].ff>=0){
                //
                val2+=a[pos2+1].ss;
                pos2++;  
                //
            }
            else{
                break;
            }
        }
        //
    }
    mx=max(val+val2-a[n].ff,mx);
    val=0,pos2=0,val2=0;
    reverse(a+1,a+n+1);
    for(int i=1;i<=n;i++){
        val=-a[i].ff;
        val2-=a[i-1].ss;
        while(pos2<i){
            val2+=a[pos2+1].ss;
            pos2++;
        }
        mx=max(val2+val+a[pos2].ff,mx);
        while(pos2<n){
            if(val+val2+a[pos2+1].ss+a[pos2+1].ff>=0){
                mx=max(val2+val+a[pos2].ff,mx);
                val2+=a[pos2+1].ss;
                pos2++;  
                mx=max(val2+val+a[pos2].ff,mx);
            }
            else{
                break;
            }
        }
        mx=max(val2+val+a[pos2].ff,mx);
    }
    cout<<mx;
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	//freopen("sparse.in", "r", stdin);
    //freopen("sparse.out", "w", stdout);
	egoist();
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 20
• Subtask 3: 0 / 20
• Subtask 4: 0 / 50