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2616. 소형기관차 - Useful Blog

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2616. 소형기관차

written by Useful·BOJ 2616


c
#include  <bits/stdc++.h>

using namespace std;

int arr[50001];
int dp[4][50001];

int main(){
    cin.tie(NULL);
    cout.tie(

NULL

)

;

ios_base

::

sync_with_stdio

(

false

)

;

int

N

,

K

;

cin

>>

N

;

for

(

int

i

=

1

;

i

<=

N

;

i

++

)

{

int

input

;

cin

>>

input

;

arr

[

i

]

=

arr

[

i

-

1

]

+

input

;

}

cin

>>

K

;

for

(

int

i

=

1

;

i

<=

3

;

i

++

)

{

for

(

int

j

=

i

*

K

;

j

<=

N

;

j

++

)

{

dp

[

i

]

[

j

]

=

max

(

dp

[

i

]

[

j

-

1

]

,

dp

[

i

-

1

]

[

j

-

K

]

+

arr

[

j

]

-

arr

[

j

-

K

]

)

;

}

}

cout

<<

dp

[

3

]

[

N

]

<<

"\n"

;

return

0

;

}