Submission #670678

#	Time	Username	Problem	Language	Result	Execution time	Memory
670678		birthdaycake	Art Exhibition (JOI18_art)	C++17	0 / 100	0 ms	212 KiB

art

#ifndef _GLIBCXX_NO_ASSERT
#include <cassert>
#endif
#include <cctype>
#include <cerrno>
#include <cfloat>
#include <ciso646>
#include <climits>
#include <clocale>
#include <cmath>
#include <csetjmp>
#include <csignal>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
 
#if __cplusplus >= 201103L
#include <ccomplex>
#include <cfenv>
#include <cinttypes>
#include <cstdbool>
#include <cstdint>
#include <ctgmath>
#include <cwchar>
#include <cwctype>
#endif
 
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <iterator>
#include <limits>
#include <list>
#include <locale>
#include <map>
#include <memory>
#include <new>
#include <numeric>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <typeinfo>
#include <utility>
#include <valarray>
#include <vector>
 

#include <array>
#include <atomic>
#include <chrono>
#include <condition_variable>
#include <forward_list>
#include <future>
#include <initializer_list>
#include <mutex>
#include <random>
#include <ratio>
#include <regex>
#include <scoped_allocator>
#include <system_error>
#include <thread>
#include <tuple>
#include <typeindex>
#include <type_traits>
#include <unordered_map>
#include <unordered_set>
#define int long long
using namespace std;
pair<int,int> a[500001],b[500001];
int seg[1<<19][2];
int N,Left,Right,W;

void Update(int Pos, int V){
    int ind = Pos + N - 1;
    seg[ind][W] = V;
    while(ind /= 2) seg[ind][W] = max(seg[ind * 2][W], seg[ind * 2 + 1][W]);
}

int Query(int l = 1, int r = N, int ind = 1){
    if(l > Right or r < Left) return -1e18;
    if(l >= Left && r <= Right) return seg[ind][W];
    int mid = (l + r) / 2;
    return max(Query(l, mid, ind * 2), Query(mid + 1, r, ind * 2 + 1));
}
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    int n, ans = 0; cin >> n;
    N = exp2(ceil(log2(n)));
    for(int i = 0; i < n; i++){
        cin >> a[i].first >> a[i].second;
    }
    sort(a,a+n);
    for(int i = 0; i < n; i++){
        if(i) a[i].second += a[i - 1].second;
        b[i].first = a[i].second - a[i].first;
        b[i].second = (i == 0 ? 0 : -a[i - 1].second) + a[i].first;
        W = 0;
        Update(i + 1, b[i].first);
        W = 1;
        Update(i + 1, b[i].second);
    }
    for(int i = 0; i < n; i++){
        Left = 1; Right = i;
        W = 1;
        ans = max(ans, b[i].first + Query());
        Left = i + 2; Right = n;
        W = 0;
        ans = max(ans, b[i].second + Query());
    }
    cout << ans;
    return 0;
}
/*
 
 */

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