Submission #1086053

#	Time	Username	Problem	Language	Result	Execution time	Memory
1086053		kiethm07	Art Exhibition (JOI18_art)	C++11	10 / 100	1048 ms	452 KiB

art

#include <bits/stdc++.h>

#define pii pair<int,int>
#define iii pair<int,pii>
#define fi first
#define se second

#define vi vector<int>
#define all(x) x.begin(),x.end()

#define TEXT "a"

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

const int inf = 1e9 + 7;
const ld eps = 1e-8;
const double pi = acos(-1);
const int N = 5e5 + 5;

struct node{
    ll a, b;
    bool operator < (const node& N) const{
        if (a != N.a) return a < N.a;
        return b < N.b;
    }
    node(){}
};

int n;
node v[N];

ll backtrack(ll M, ll m, ll s, ll i){
    if (i > n){
        if (M == LLONG_MIN) return LLONG_MIN;
        return s - (M - m);
    }
    ll res = LLONG_MIN;
    res = max(res,backtrack(max(M,v[i].a),min(m,v[i].a), s + v[i].b, i + 1));
    res = max(res,backtrack(M,m,s,i + 1));
    return res;
}

int main(){
    cin.tie(0) -> sync_with_stdio(0);
    if (fopen(TEXT".inp","r")){
        freopen(TEXT".inp","r",stdin);
        freopen(TEXT".out","w",stdout);
    }
    ll res = LLONG_MIN;
    cin >> n;
    for (int i = 1; i <= n; i++){
        cin >> v[i].a >> v[i].b;
    }
    sort(v + 1,v + 1 + n);
    v[0].a = v[1].a;
    v[0].b = 0;
    ll p = 0;
    ll cur = v[0].a;
    for (int i = 1; i <= n; i++){
        p += v[i].b;
        res = max(res,p - v[i].a + cur);
        cur = max(cur,v[i].a - p);
    }
    //cout << res << "\n";
    cout << backtrack(LLONG_MIN, LLONG_MAX, 0, 1) << "\n";
    return 0;
}

Compilation message (stderr)

art.cpp: In function 'int main()':
art.cpp:50:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   50 |         freopen(TEXT".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
art.cpp:51:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |         freopen(TEXT".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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