Submission #989368

#	Time	Username	Problem	Language	Result	Execution time	Memory
989368		muhammad	Feast (NOI19_feast)	C++17	100 / 100	92 ms	10532 KiB

feast

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

#define ll long long
#define pli pair<ll, int>

const int mxN=3e5;
int n, k;
ll a[mxN+1], lb, rb=3e14;
pli dp[mxN+1];

pli cdp(ll x) {
	memset(dp, 0, sizeof(dp));
	pli ms{};
	for(int i=0; i<n; ++i) {
		pli cs{dp[i].first-a[i], dp[i].second};
		if(cs.first^ms.first?cs.first>ms.first:cs.second<ms.second)
			ms=cs;
		pli nd{ms.first-x+a[i+1], ms.second+1};
		dp[i+1]=(nd.first^dp[i].first?nd.first>dp[i].first:nd.second<dp[i].second)?nd:dp[i];
	}
	return dp[n];
}

int main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	cin >> n >> k;
	for(int i=0; i<n; ++i)
		cin >> a[i+1], a[i+1]+=a[i];
	while(lb<rb) {
		ll mb=(lb+rb)/2;
		if(cdp(mb).second<=k)
			rb=mb;
		else
			lb=mb+1;
	}
	pli r=cdp(lb);
	cout << r.first+k*lb;
}

Compilation message (stderr)

feast.cpp: In function 'std::pair<long long int, int> cdp(long long int)':
feast.cpp:13:26: warning: 'void* memset(void*, int, size_t)' clearing an object of type 'struct std::pair<long long int, int>' with no trivial copy-assignment; use assignment instead [-Wclass-memaccess]
   13 |  memset(dp, 0, sizeof(dp));
      |                          ^
In file included from /usr/include/c++/10/bits/stl_algobase.h:64,
                 from /usr/include/c++/10/bits/specfun.h:45,
                 from /usr/include/c++/10/cmath:1927,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:41,
                 from feast.cpp:1:
/usr/include/c++/10/bits/stl_pair.h:211:12: note: 'struct std::pair<long long int, int>' declared here
  211 |     struct pair
      |            ^~~~

• 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