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답안 #366698

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
366698 2021-02-15T04:37:49 Z mickeyandkaka Feast (NOI19_feast) C++17
18 / 100
 153 ms 16236 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];

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

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

int check(LL c)
{
    for (int i = 0; i <= n; i++) dp[i] = INT_MIN;

    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];

        // mid越大 段数越小
        // 段数不超过k
        // mid尽可能小
        LL lo = -1e15, hi = 1e15;
        while (lo + 1 < hi)
        {
            LL mid = lo + (hi - lo) / 2;

            if (check(mid) <= k) hi = mid;
            else
                lo = mid;
        }
        debug(lo, hi);

        int v = check(hi);

        debug(hi, v);
        debug(cnt[n], k, dp[n]);

        LL ans = dp[n] + hi * cnt[n];
        ans = max(ans, 0ll);

        cout << ans << endl;
    }

    return 0;
}

Compilation message

feast.cpp: In function 'int main()':
feast.cpp:102:13: warning: unused variable 'v' [-Wunused-variable]
  102 |         int v = check(hi);
      |             ^

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 93 ms 15596 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 14060 KB Output is correct
2 Correct 109 ms 14316 KB Output is correct
3 Correct 90 ms 14080 KB Output is correct
4 Incorrect 90 ms 14188 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
18.0 / 18.0

# 결과 실행 시간 메모리 Grader output
1 Correct 123 ms 16108 KB Output is correct
2 Correct 121 ms 15980 KB Output is correct
3 Correct 120 ms 16108 KB Output is correct
4 Correct 118 ms 15980 KB Output is correct
5 Correct 118 ms 16056 KB Output is correct
6 Correct 126 ms 16236 KB Output is correct
7 Correct 122 ms 16236 KB Output is correct
8 Correct 141 ms 16108 KB Output is correct
9 Correct 153 ms 16236 KB Output is correct
10 Correct 121 ms 16236 KB Output is correct

Subtask #4
0 / 10.0

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

Subtask #5
0 / 11.0

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

Subtask #6
0 / 20.0

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

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 93 ms 15596 KB Output isn't correct
2 Halted 0 ms 0 KB -