Algorithm

F1. Pictures with Kittens (easy version)
time limit per test
2 seconds
memory limit per test
256 megabytes
Problem link- https://codeforces.com/contest/1077/problem/F1
input
standard input
output
standard output

The only difference between easy and hard versions is the constraints.

Vova likes pictures with kittens. The news feed in the social network he uses can be represented as an array of n� consecutive pictures (with kittens, of course). Vova likes all these pictures, but some are more beautiful than the others: the i�-th picture has beauty ai��.

Vova wants to repost exactly x� pictures in such a way that:

  • each segment of the news feed of at least k� consecutive pictures has at least one picture reposted by Vova;
  • the sum of beauty values of reposted pictures is maximum possible.

For example, if k=1�=1 then Vova has to repost all the pictures in the news feed. If k=2�=2 then Vova can skip some pictures, but between every pair of consecutive pictures Vova has to repost at least one of them.

Your task is to calculate the maximum possible sum of values of reposted pictures if Vova follows conditions described above, or say that there is no way to satisfy all conditions.

Input

The first line of the input contains three integers n,k�,� and x� (1≤k,x≤n≤2001≤�,�≤�≤200) — the number of pictures in the news feed, the minimum length of segment with at least one repost in it and the number of pictures Vova is ready to repost.

The second line of the input contains n� integers a1,a2,…,an�1,�2,…,�� (1≤ai≤1091≤��≤109), where ai�� is the beauty of the i�-th picture.

Output

Print -1 if there is no way to repost some pictures to satisfy all the conditions in the problem statement.

Otherwise print one integer — the maximum sum of values of reposted pictures if Vova follows conditions described in the problem statement.

Examples
input
Copy
5 2 3
5 1 3 10 1
output
Copy
18
input
Copy
6 1 5
10 30 30 70 10 10
output
Copy
-1
input
Copy
4 3 1
1 100 1 1
output
Copy
100

 

Code Examples

#1 Code Example with C++ Programming

Code - C++ Programming


#include <bits/stdc++.h>

using namespace std;

int const N = 2e2 + 1;
int n, k, x, a[N];
long long dp[N][N][N];

long long rec(int idx, int prv, int rem) {
  if(rem < 0 || prv >= k)
    return -1e15;
  if(idx == n)
    return rem == 0 ? 0 : -1e15;

  long long &ret = dp[idx][prv][rem];
  if(ret != -1)
    return ret;
  ret = -1e15;

  ret = max(ret, rec(idx + 1, prv + 1, rem));
  ret = max(ret, rec(idx + 1, 0, rem - 1) + a[idx]);

  return ret;
}

int main() {
  scanf("%d %d %d", &n, &k, &x);
  for(int i = 0; i < n; ++i)
    scanf("%d", a + i);

  memset(dp, -1, sizeof dp);
  long long res = rec(0, 0, x);

  if(res <= 0)
    puts("-1");
  else
    printf("%lld\n", res);

  return 0;
}
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Input

x
–
+
cmd
5 2 3
5 1 3 10 1

Output

x
–
+
cmd
18
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Demonstration

Codeforces Solution-F1. Pictures with Kittens (easy version)-Solution in C, C++, Java, Python

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