Submission #1103149

#	Time	Username	Problem	Language	Result	Execution time	Memory
1103149		joyboy23ti	Feast (NOI19_feast)	C++14	41 / 100	488 ms	262144 KiB

feast

#include <bits/stdc++.h>

#define int long long
#define N 300005
#define pb push_back
#define mod 1000000007
#define fi first
#define se second
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define pii pair<int,int>
#define INF 1e18
#define FOR(i, a, b) for(int i = a; i <= b; ++i)
#define FORD(i, a, b) for(int i = a; i >= b; --i)

using namespace std;

int n, k, a[N], pre[N], dp[5500][5500];

void proc()
{
   cin >> n >> k;
   FOR(i, 1, n) cin >> a[i];
   FOR(i, 1, n) pre[i] = pre[i - 1] + a[i];
   FOR(i, 1, k)
   {
       int mx = -INF;
       FOR(j, 1, n)
       {
           mx = max(mx, dp[j - 1][i - 1] - pre[j - 1]);
           dp[j][i] = max(dp[j - 1][i], mx + pre[j]);
       }
   }
   cout << dp[n][k];
}

int32_t main() {

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

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

    int T; T = 1;
    //cin >> T;
    while (T--) proc();
}

Compilation message (stderr)

feast.cpp: In function 'int32_t main()':
feast.cpp:41:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |         freopen("test.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
feast.cpp:42:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |         freopen("test.out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 18
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11
• Subtask 6: 20 / 20
• Subtask 7: 0 / 29