제출 #1268553

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1268553		monaxia	Feast (NOI19_feast)	C++20	0 / 100	120 ms	35140 KiB

feast

#include <bits/stdc++.h>
#include <ext/random>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>

// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define pb push_back
#define ppb pop_back
#define fr first
#define sc second
#define all(v) v.begin(), v.end()
#define vektor vector

using namespace std;
using namespace __gnu_pbds; 

using ll = long long;
using ull = unsigned long long;
using ld = long double;

constexpr ull Mod = 1e9 + 7;
constexpr ull sqr = 547;
constexpr ld eps = 1e-9;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll random(ll l, ll r) {if(l <= r) return uniform_int_distribution <ll> (l, r)(rng); return -1;} 

void solve(){ 
    ll n, k;
    cin >> n >> k;

    vector <ll> a(n + 1);
    vector <vector <ll>> dp(n + 1, vector <ll> (2, 0)), cnt(n + 1, vector <ll> (2, 0));

    dp[0][1] = -1;

    for(int i = 1; i <= n; i ++) cin >> a[i];

    ll l = 0, r = 1e9 * n, ans = 0;

    while(l <= r){
        ll mid = (l + r) >> 1;

        dp[0][1] = mid - 1;

        for(int i = 1; i <= n; i ++){
            if(dp[i - 1][0] > dp[i - 1][1]){
                dp[i][0] = dp[i - 1][0];
                cnt[i][0] = cnt[i - 1][0];
            }

            else{
                dp[i][0] = dp[i - 1][1];
                cnt[i][0] = cnt[i - 1][1];
            }

            if(dp[i - 1][1] + a[i] == dp[i - 1][0] + a[i] - mid){
                dp[i][1] = dp[i - 1][1] + a[i];
                cnt[i][1] = max(cnt[i - 1][1], cnt[i - 1][0] + 1);
            }

            else if(dp[i - 1][1] + a[i] > dp[i - 1][0] + a[i] - mid){
                dp[i][1] = dp[i - 1][1] + a[i];
                cnt[i][1] = cnt[i - 1][1];
            }

            else{
                dp[i][1] = dp[i - 1][0] + a[i] - mid;
                cnt[i][1] = cnt[i - 1][0] + 1;
            }
        }

        if(dp[n][0] < dp[n][1]) swap(cnt[n][0], cnt[n][1]);

        if(cnt[n][0] > k) l = mid + 1;
        else r = mid - 1, ans = mid;
    }

    dp[0][1] = -1e9;

    for(int i = 1; i <= n; i ++){
        if(dp[i - 1][0] > dp[i - 1][1]){
            dp[i][0] = dp[i - 1][0];
            cnt[i][0] = cnt[i - 1][0];
        }

        else{
            dp[i][0] = dp[i - 1][1];
            cnt[i][0] = cnt[i - 1][1];
        }

        if(dp[i - 1][1] + a[i] == dp[i - 1][0] + a[i] - ans){
            dp[i][1] = dp[i - 1][1] + a[i];
            cnt[i][1] = max(cnt[i - 1][1], cnt[i - 1][0] + 1);
        }

        else if(dp[i - 1][1] + a[i] > dp[i - 1][0] + a[i] - ans){
            dp[i][1] = dp[i - 1][1] + a[i];
            cnt[i][1] = cnt[i - 1][1];
        }

        else{
            dp[i][1] = dp[i - 1][0] + a[i] - ans;
            cnt[i][1] = cnt[i - 1][0] + 1;
        }
    }

    // cout << dp[0][1] + a[1] - ans;

    cout << ans;
} 

main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL); 

    if(fopen("COUNTSEQ.inp", "r")){
        freopen("COUNTSEQ.inp", "r", stdin);
        freopen("COUNTSEQ.out", "w", stdout);
    }

    int t = 1;

    // cin >> t;

    while(t --){
        solve();
        cout << "\n";
    }
}

컴파일 시 표준 에러 (stderr) 메시지

feast.cpp:116:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  116 | main(){
      | ^~~~
feast.cpp: In function 'int main()':
feast.cpp:121:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  121 |         freopen("COUNTSEQ.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:122:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  122 |         freopen("COUNTSEQ.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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