oj.uz

답안 #365840

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
365840 2021-02-12T12:42:44 Z mickeyandkaka Feast (NOI19_feast) C++17
0 / 100
 211 ms 13164 KB 
//{{{
#include <bits/stdc++.h>
using namespace std;
using LL = long long;
using VLL = vector<LL>;
using vi = vector<int>;
using pii = pair<int, int>;
#define sz(x) (int)((x).size())
#define all(x) (x).begin(), (x).end()
#define clr(a, b) memset(a, b, sizeof(a))
#ifdef LOCAL
#include "prettyprint.hpp"
// clang-format off
void _print() { cerr << "]\033[0m\n"; }
template <typename T> void __print(T x) { cerr << x; }
template <typename T, typename... V> void _print(T t, V... v) { __print(t); if (sizeof...(v)) cerr << ", "; _print(v...); }
#define debug(x...) cerr << "\033[1;34m[" << #x << "] = \033[1;32m["; _print(x)
#define debug_arr(x...) cerr << "\033[1;34m[" << #x << "] = \033[1;32m" << (x) << "\033[0m\n"
#else
#define debug(x...)
#define debug_arr(x...)
#endif
// clang-format on
//}}}

const int N = 3e5 + 10;
// const int N = 10;
int n, k;
int a[N];
LL s[N];

double dp[N];
LL cnt[N];

double minf[N];
LL minf_p[N];

int check(double c)
{
    dp[0] = 0, cnt[0] = 0;
    minf[0] = dp[0] - s[0];
    minf_p[0] = 0;

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

        if (minf[i - 1] + s[i] - c > dp[i])
        {
            dp[i] = minf[i - 1] + s[i] - c;
            // debug(i, dp[i]);

            cnt[i] = cnt[minf_p[i - 1]] + 1;
        }

        minf[i] = minf[i - 1];
        minf_p[i] = minf_p[i - 1];

        if (dp[i] - s[i] > minf[i])
        {
            minf[i] = dp[i] - s[i];
            minf_p[i] = i;
        }
    }
    // if (cnt[n] == 0) return k + 1;
    return cnt[n];
}

int main()
{
#ifdef LOCAL
    freopen("in", "r", stdin);
    // freopen("out", "w", stdout);
#endif

    ios::sync_with_stdio(false);
    cin.tie(0);

    while (cin >> n >> k)
    {
        for (int i = 1; i <= n; ++i) cin >> a[i];
        s[0] = 0;
        for (int i = 1; i <= n; ++i) s[i] = s[i - 1] + a[i];

        double lo = -1e18, hi = 1e18;
        // LL lo = -1e10, hi = 1e10;
        for (int o = 1; o <= 100; o++)
        {
            // LL mid = lo + (hi - lo) / 2;
            double mid = (lo + hi) / 2.0;
            // debug(lo, hi, mid);
            // cout << lo << " " << hi << " " << mid << " ";

            if (check(mid) <= k) hi = mid;
            else
                lo = mid;
            // cout << cnt[n] << endl;
            if (hi - lo < 1e-6) break;
            // debug(lo, hi, cnt[n]);
        }
        // debug(lo, hi);

        // debug(hi);

        // for (int p = -100; p <= 100; p++)
        //{
        // check(p);
        // debug(p, cnt[n]);
        //}
        // debug("======");

        // double lo = -2;
        // check(lo);
        // debug_arr(dp);
        // debug_arr(cnt);

        // double hi = -0.9999;
        check(hi);

        // debug_arr(dp);
        // debug_arr(cnt);
        double ans = dp[n] + hi * cnt[n];
        // debug(ans);
        ans = max(ans, 0.0);
        // ans = LL(ans);

        cout << ans << endl;
    }

    return 0;
}

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 189 ms 12908 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 113 ms 13036 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 211 ms 13164 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 1 ms 364 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 189 ms 12908 KB Output isn't correct
2 Halted 0 ms 0 KB -