Submission #1188275

#	Time	Username	Problem	Language	Result	Execution time	Memory
1188275		sitingfake	Feast (NOI19_feast)	C++20	100 / 100	97 ms	12104 KiB

feast

#include<bits/stdc++.h>
using namespace std;

// define

#define execute cerr << "Time elapsed: " << (1.0 * clock() / CLOCKS_PER_SEC) << "s";
#define ll long long
#define int long long
#define ld long double
#define ii pair<int,int>
#define se second
#define fi first
#define iii pair<int,ii>
#define all(v) v.begin(),v.end()
#define bit(x,i) (((x)>>(i))&1LL)
#define flip(x,i) ((x)^(1LL<<(i)))
#define ms(d,x) memset(d,x,sizeof(d))
#define sitingfake 1
#define orz 1

template<typename T> bool maximize(T &a, const T &b)
{
    if(a < b) {a = b; return 1;}
    return 0;
}
template<typename T> bool minimize(T &a, const T &b)
{
    if(a > b) {a = b;return 1;}
    return 0;
}

//constant

const ll mod = 1e9+7;
const long long linf = 4557430888798830399;
const int inf = 1061109567;
const int maxarr = 1e6+5;
const int dx[] = {0,1,-1,0};
const int dy[] = {1,0,0,-1};


//code

const int maxn = 3e5 + 7;

ii dp[maxn][2];

int n , k;

ll a[maxn];

ii check(ll lamda)
{
    dp[1][0] = ii(0,0);
    dp[1][1] = ii(a[1] - lamda,1);

    for(int i=2;i<=n;i++)
    {
        dp[i][0] = max(dp[i-1][0],dp[i-1][1]);
        dp[i][1] = max(ii(dp[i-1][0].fi + a[i] - lamda,dp[i-1][0].se + 1),ii(dp[i-1][1].fi + a[i],dp[i-1][1].se));
    }
    return max(dp[n][0],dp[n][1]);
}

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

    for(int i=1;i<=n;i++)
    {
        cin >> a[i];
    }
    ll l = 0, r = 0, ans = 0;
    for(int i=1;i<=n;i++)
    {
        if(a[i] > 0) r += a[i];
    }

    while(l <= r)
    {
        int mid = (r + l) >> 1;
        if(check(mid).se >= k)
        {
            ans = mid;
            l = mid + 1;
        }
        else r = mid - 1;
    }

    cout << check(ans).fi + ans * 1ll *k;
}

signed main()
{
   ios_base::sync_with_stdio(0);
   cin.tie(0);
   cout.tie(0);

   #define task ""

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

   int tc; tc = 1;

   while(tc--) solve();

   //execute;
}

/**
**/

Compilation message (stderr)

feast.cpp: In function 'int main()':
feast.cpp:103:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  103 |        freopen(task".inp","r",stdin);
      |        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
feast.cpp:104:15: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |        freopen(task".out","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