제출 #1342593

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1342593		ziad3ssam10	Feast (NOI19_feast)	C++20	100 / 100	739 ms	77908 KiB

feast

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

using namespace std;
using namespace __gnu_pbds;
template<typename T>
using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define int long long
#define ll long long
#define ld long double
#define endl '\n'
#define wady                      \
ios_base::sync_with_stdio(0); \
cin.tie(0);                   \
cout.tie(0);

void files() {
#ifndef ONLINE_JUDGE
    freopen("in.txt", "r", stdin);
    freopen("out.txt", "w", stdout);
#endif
}


void solve() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    for (auto &i: a)cin >> i;
    vector<vector<pair<int,int> > > dp(n + 2, vector<pair<int,int> >(2));
    vector<vector<int> > vis(n + 2, vector<int>(2));
    int lamda = 0;
    int timer = 0;
    function<pair<int,int> (int,int)> rec = [&](int idx,int lst)-> pair<int,int> {
        if (idx == n) return {0, 0};
        auto &ret = dp[idx][lst];
        if (vis[idx][lst] == timer) return ret;
        vis[idx][lst] = timer;
        auto leave = rec(idx + 1, 0);
        auto take = rec(idx + 1, 1);
        take.first += a[idx];
        if (!lst) {
            take.first -= lamda;
            take.second--;
        }
        return ret = max(leave, take);
    };
    int l = 0, r = 1e15;
    int ans = 0;
    while (l <= r) {
        int mid = l + (r - l) / 2;
        lamda = mid;
        timer++;
        auto [cur,cnt] = rec(0, 0);
        int temp = -cnt;
        if (temp > k)l = mid + 1;
        else {
            ans = (cur + (__int128_t) mid * k);
            r = mid - 1;
        }
    }
    cout << ans << endl;
}


signed main() {
    wady

    int t = 1;
    int tc = 1;
    while (t--)
        solve();
}

컴파일 시 표준 에러 (stderr) 메시지

feast.cpp: In function 'void files()':
feast.cpp:20:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |     freopen("in.txt", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
feast.cpp:21:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |     freopen("out.txt", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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