Submission #1249102

#	Time	Username	Problem	Language	Result	Execution time	Memory
1249102		M_SH_O	Feast (NOI19_feast)	C++20	4 / 100	27 ms	4940 KiB

feast

/*#pragma GCC optimize("O3")
#pragma GCC optimization("Ofast,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")*/
#include <bits/stdc++.h>
//#include "algotester_generator.h"
/*#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>*/

#define ll long long
#define ll1 long long
#define ull unsigned long long
#define dou long double
#define str string
#define vll vector<ll>
#define vi vector<int>
#define pll pair<ll, ll>
#define vpll vector<pll>
#define vbool vector<bool>
#define vstr vector<str>
#define vvll vector<vll>
#define pb push_back
#define pf push_front
#define endl "\n"
#define fr first
#define se second
// #define sortcmp(a) sort(a.begin(), a.end(), cmp)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define INF 1000000000000000000
#define ordered_set tree<ll, null_type, less_equal<ll>, rb_tree_tag, tree_order_statistics_node_update>

using namespace std;
//using namespace __gnu_pbds;

mt19937 rng(time(0));
ll randll(ll l, ll r){
    return uniform_int_distribution<ll>(l, r)(rng);
}

int main(){
    speed;
    
    ll n, m;
    cin >> n >> m;
    vll a(n);
    for(int i =0 ; i < n; i ++){
        cin >> a[i];
    }
    
    vll v;
    ll k = a[0];
    for(int i = 1; i < n; i ++){
        if((a[i] < 0) != (a[i-1] < 0)){
            v.pb(k);
            k = a[i];
        }
        else k += a[i];
    }
    v.pb(k);
    if(v.back() < 0) v.pop_back();
    vll v1, v2;
    k = 0;
    for(int i = 0; i < v.size(); i ++){
        if(k+v[i] < 0){
            v1.pb(k);
            k = 0;
        }
        else{
            k += v[i];
            if(v[i] < 0) v2.pb(v[i]);
        }
    }
    v1.pb(k);
    sort(v1);
    sort(v2);
    /*for(int i : v1){
        cout << i << ' ';
    }*/
    //cout << endl;
    ll res = 0;
    if(v1.size() >= m){
        reverse(v1);
        for(int i = 0; i < m; i ++){
            res += v1[i];
        }
        cout << res << endl;
    }
    else{
        reverse(v1);
        for(int i = 0; i < v1.size(); i ++){
            
            res += v1[i];
        }
        for(int i = 0; i < min(m-(ll)v1.size(), (ll)v2.size()); i ++){
            res -= v2[i];
        }
        cout << res << endl;
    }
    //cout << 1 << endl;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 18
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11
• Subtask 6: 0 / 20
• Subtask 7: 0 / 29