oj.uz

답안 #791851

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
791851 2023-07-24T11:22:09 Z vjudge1 Feast (NOI19_feast) C++17
22 / 100
 72 ms 9716 KB 
/*
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("unroll-loops")
*/
#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(), x.end()
#define len(x) ll(x.size())
#define eb emplace_back
#define PI acos(-1.0)
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define MIN(v) *min_element(all(v))
#define MAX(v) *max_element(all(v))
#define BIT(x, i) (1 & ((x) >> (i)))
#define MASK(x) (1LL << (x))
#define task "tnc"
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
typedef long long ll;
typedef long double ld;
const ll INF = 1e14;
const int maxn = 1e6 + 5;
const int mod = 1e9 + 7;
const int mo = 998244353;
using pi = pair<ll, ll>;
using vi = vector<ll>;
using pii = pair<pair<ll, ll>, ll>;
mt19937 rng(chrono::high_resolution_clock::now().time_since_epoch().count());
ll n, k;
ll a[maxn];
ll dp[maxn];
ll trace[maxn];
ll pre[maxn];
ll f(ll mid)
{
    // dp[i] = max(dp[i-1],dp[j]+dp[i]-pre[j]+pre[i]-mid);
    dp[0] = 0;
    ll ma = 0;
    ll vt = 0;
    trace[0] = 0;
    for (int i = 1; i <= n; i++)
    {
        dp[i] = 0;
        trace[i] = 0;
    }

    for (int i = 1; i <= n; i++)
    {

        if (dp[i - 1] <= ma + pre[i] - mid)
        {
            dp[i] = ma + pre[i] - mid;
            trace[i] = trace[vt] + 1;
        }
        else
        {
            trace[i] = trace[i - 1];
        }
        if (ma <= dp[i] - pre[i])
        {
            ma = dp[i] - pre[i];
            vt = i;
        }
    }
    return trace[n];
}
void solve()
{
    cin >> n >> k;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
        pre[i] = pre[i - 1] + a[i];
    }
    ll l = 0;
    ll r = INF;
    ll ans;
    ll ans1;
    while (l <= r)
    {
        ll mid = (l + r) / 2;
        if (f(mid) >= k)
        {
            ans = dp[n];
            ans1 = mid;
            l = mid + 1;
        }
        else
        {
            r = mid - 1;
        }
    }
    if (ans1 <= 0)
    {
        f(0);
        cout << dp[n];
    }
    else
    {
        cout << ans + ans1 * k;
    }
}
signed main()
{
    cin.tie(0), cout.tie(0)->sync_with_stdio(0);

    solve();
}

Compilation message

feast.cpp: In function 'void solve()':
feast.cpp:104:28: warning: 'ans1' may be used uninitialized in this function [-Wmaybe-uninitialized]
  104 |         cout << ans + ans1 * k;
      |                       ~~~~~^~~
feast.cpp:104:30: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  104 |         cout << ans + ans1 * k;
      |                              ^

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 47 ms 9388 KB Output is correct
2 Correct 47 ms 9556 KB Output is correct
3 Correct 50 ms 9656 KB Output is correct
4 Correct 48 ms 9572 KB Output is correct
5 Correct 47 ms 9604 KB Output is correct
6 Correct 46 ms 9464 KB Output is correct
7 Correct 46 ms 9420 KB Output is correct
8 Correct 48 ms 9640 KB Output is correct
9 Correct 46 ms 9368 KB Output is correct
10 Correct 47 ms 9492 KB Output is correct

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 50 ms 9428 KB Output is correct
2 Correct 51 ms 9684 KB Output is correct
3 Correct 50 ms 9492 KB Output is correct
4 Incorrect 44 ms 9556 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 71 ms 9628 KB Output is correct
2 Correct 69 ms 9516 KB Output is correct
3 Correct 70 ms 9556 KB Output is correct
4 Correct 69 ms 9508 KB Output is correct
5 Correct 69 ms 9556 KB Output is correct
6 Correct 68 ms 9560 KB Output is correct
7 Correct 70 ms 9688 KB Output is correct
8 Correct 68 ms 9604 KB Output is correct
9 Correct 72 ms 9716 KB Output is correct
10 Correct 70 ms 9684 KB Output is correct

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 340 KB Output is correct
2 Incorrect 0 ms 340 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 47 ms 9388 KB Output is correct
2 Correct 47 ms 9556 KB Output is correct
3 Correct 50 ms 9656 KB Output is correct
4 Correct 48 ms 9572 KB Output is correct
5 Correct 47 ms 9604 KB Output is correct
6 Correct 46 ms 9464 KB Output is correct
7 Correct 46 ms 9420 KB Output is correct
8 Correct 48 ms 9640 KB Output is correct
9 Correct 46 ms 9368 KB Output is correct
10 Correct 47 ms 9492 KB Output is correct
11 Correct 50 ms 9428 KB Output is correct
12 Correct 51 ms 9684 KB Output is correct
13 Correct 50 ms 9492 KB Output is correct
14 Incorrect 44 ms 9556 KB Output isn't correct
15 Halted 0 ms 0 KB -