Submission #366249

#	Time	Username	Problem	Language	Result	Execution time	Memory
366249		vaaven	Cake 3 (JOI19_cake3)	C++17	24 / 100	4059 ms	12156 KiB

cake3

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#include <iostream>
#include <vector>
#include <algorithm>
#include <math.h>
#include <set>
#include <stack>
#include <iomanip>
#include <bitset>
#include <map>
#include <cassert>
#include <array>
#include <queue>
#include <cstring>
#include <random>
#include <unordered_set>
#include <unordered_map>
#define pqueue priority_queue
#define pb(x) push_back(x)
// #define endl '\n'
#define all(x) x.begin(), x.end()
#define int long  long
 
using namespace std;
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
// typedef tuple<ll, ll, ll> tiii;
typedef pair<int, int> pii;
typedef vector<pair<int, int> > vpii;
typedef vector<bool> vb;
typedef vector<string> vs;
typedef vector<char> vc;
 
const int inf = 1e9 + 228;
const ll mod = 1e9 + 7;
const ll mod2 = 998244353;
const ld eps = 1e-14;
 
 
void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
//    freopen("inputik.txt", "r", stdin);
//    freopen("outputik.txt", "w", stdout);
}

vpii kek;
int n, m;
int ans = 0;
int all_ans = -inf*inf;
int cl = 0, cr = -1;
multiset<int> fir, sec;

int get(int l, int r){
    while(cr < r){
        cr++;
//        cout << " + " << kek[cr].second << endl;
        sec.insert(kek[cr].second);
        ans += kek[cr].second;
        if(sec.size() > m-2){
            ans -= *sec.begin();
            fir.insert(*sec.begin());
            sec.erase(sec.begin());
        }
    }
    while(cl > l){
        cl--;
//        cout << " + " << kek[cl].second << endl;
        sec.insert(kek[cl].second);
        ans += kek[cl].second;
        if(sec.size() > m-2){
            ans -= *sec.begin();
            fir.insert(*sec.begin());
            sec.erase(sec.begin());
        }
    }
    while(cr > r){
        auto it = sec.find(kek[cr].second);
//        cout << " - " << kek[cr].second << endl;
        if(it == sec.end()){
            fir.erase(fir.find(kek[cr].second));
        } else{
            ans -= *it;
            sec.erase(it);
            if(fir.size()){
                sec.insert(*(--fir.end()));
                ans += *(--fir.end());
                fir.erase(--fir.end());
            }
        }
        cr--;
    }
    while(cl < l){
//        cout << " - " << kek[cl].second << endl;
        auto it = sec.find(kek[cl].second);
        if(it == sec.end()){
            fir.erase(fir.find(kek[cl].second));
        } else{
            ans -= *it;
            sec.erase(it);
            if(fir.size()){
                sec.insert(*(--fir.end()));
                ans += *(--fir.end());
                fir.erase(--fir.end());
            }
        }
        cl++;
    }
    return ans;
}

void calc(int l, int r, int tl, int tr){
    if(l > r)
        return;
    int mid = (l + r)/2;
    int res = -inf*inf, pos = tr;
    for(int i=max(mid+m-1, tl); i<=tr; i++){
        if(res <= get(mid+1, i-1) + kek[i].second + kek[mid].second - (kek[i].first - kek[mid].first)*2){
            res = ans + kek[i].second + kek[mid].second - (kek[i].first - kek[mid].first)*2;
            pos = i;
        }
    }
    all_ans = max(all_ans, res);
    calc(l, mid-1, tl, pos);
    calc(mid+1, r, pos, tr);
}

void solve(){
    cin >> n >> m;
    kek.resize(n);
    for(int i=0; i<n; i++){
        int a, b;
        cin >> a >> b;
        kek[i] = make_pair(b, a);
    }
    sort(all(kek));
    calc(0, n-1, 0, n-1);
    cout << all_ans << endl;
}

/*
5 3
2 1
4 2
6 4
8 8
10 16
======
8 4
112103441 501365808
659752417 137957977
86280801 257419447
902409188 565237611
965602301 689654312
104535476 646977261
945132881 114821749
198700181 915994879
 */
 
signed main(){
     fast_io();
//  srand(time(NULL));
    cout << fixed << setprecision(10);
    int q = 1;
//    cin >> q;
    while(q--)
        solve();
}

Compilation message (stderr)

cake3.cpp: In function 'long long int get(long long int, long long int)':
cake3.cpp:65:23: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   65 |         if(sec.size() > m-2){
      |            ~~~~~~~~~~~^~~~~
cake3.cpp:76:23: warning: comparison of integer expressions of different signedness: 'std::multiset<long long int>::size_type' {aka 'long unsigned int'} and 'long long int' [-Wsign-compare]
   76 |         if(sec.size() > m-2){
      |            ~~~~~~~~~~~^~~~~

• Subtask 1: 5 / 5
• Subtask 2: 19 / 19
• Subtask 3: 0 / 76