Submission #2423421

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Source Code Expand

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

#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for(int i = 0;i < (n);i++)
#define FOR(i, a, b) for(int i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second

using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;

const double eps = 1e-6;

template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}

const int64 mod = 1e9+7;

/*
int main(void){
	int32 N;
	cin >> N;
	vector<int64> v(N);
	REP(i, N) cin >> v[i];

	int64 maxi = 0;
	int64 res = 0;
	REP(i, N){
		int64 cnt = (v[i]-1)/(maxi+1);
		if(cnt){ res += cnt; chmax(maxi, 1); }
		else maxi = v[i];
	}
	cout << res << endl;
}
*/

int main(void){
	int32 M, N, K;
	cin >> N >> M >> K;
	vector<int64> A(N);
	deque<PLL> deq[301];
	REP(i, N) cin >> A[i];

	REP(i, N){
		for(int32 j = K-1;j >= 1;j--){
			while(i-deq[j-1].front().sc > M) deq[j-1].pop_front();
			int64 val = deq[j-1].front().fs+A[i]*(j+1);
			while(deq[j].size() && val > deq[j].back().fs) deq[j].pop_back();

			deq[j].push_back(PLL(val, i));
		}
		while(deq[0].size() && A[i] > deq[0].back().fs) deq[0].pop_back();
		deq[0].push_back(PLL(A[i], i));
	}

	cout << deq[K-1].front().fs << endl;
}

Submission Info

Judge Result