시간 제한메모리 제한제출정답맞힌 사람정답 비율
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문제

오늘도 평화로운 KSA 수업 시간에서는 활쏘기 대결을 한다. 총 $N$개의 표적이 준비되어 있다. 표적들은 맨 위에 하나가 고정되어 있고 그 아래로 줄줄이 하나씩 매달려 있다. 표적의 번호는 $1$부터 $N$까지 매겨져 있으며, 맨 위의 표적이 $1$번이고, $i(1<i\leq N)$번 표적은 $i-1$번 표적에 매달려 있다. $i$번 표적의 점수는 $A_i$이다.

두 플레이어가 번갈아 가며 차례를 가지며, 자신의 차례가 되면 아래 두 가지 동작 중 하나를 선택해서 할 수 있다.

  • 표적 하나를 선택하고 활을 쏴서 맞힌다.
  • 기권한다.

표적을 활로 맞히면 표적이 파괴되며 표적의 점수가 맞힌 사람의 점수에 합산된다. 파괴된 표적 밑에 달린 표적들은 바닥에 떨어지며, 떨어졌지만 파괴되지 않은 표적들의 점수는 상대방의 점수에 합산된다. 기권할 경우, 파괴되지 않고 떨어지지도 않은 모든 표적의 점수가 상대방의 점수에 합산되고 즉시 게임이 종료된다. 모든 표적이 파괴되거나 떨어진 경우에도 게임이 종료된다. 이번에 참가할 두 학생은 엄청난 명사수라서 선택한 표적을 반드시 맞힐 수 있으며, 자신의 점수를 최대화하기 위해 최적의 선택만을 한다. 게임 결과를 예측해 보자.

입력

첫 번째 줄에 정수 $N$이 주어진다.

두 번째 줄에 각 표적의 점수를 나타내는 $N$개의 정수 $A_1, A_2, \cdots, A_N$이 공백으로 구분되어 주어진다.

출력

선공이 가져갈 점수를 출력한다.

제한

  • $1 \leq N \leq 2 \times 10^5$
  • $-10^9 \leq A_i \leq 10^9$

서브태스크

번호배점제한
126

$N \leq 1000$

227

$A_i \ge 0$ $(1 \le i \le N)$

347

추가 제약 조건 없음

예제 입력 1

3
1 10 100

예제 출력 1

101

게임은 아래와 같이 진행된다.

  • 선공이 $3$번 표적을 맞히고 $100$점을 얻는다.
  • 후공이 $2$번 표적을 맞히고 $10$점을 얻는다.
  • 선공이 $1$번 표적을 맞히고 $1$점을 얻는다.
  • 모든 표적이 파괴되거나 떨어졌으므로 게임이 종료된다.

예제 입력 2

3
1 -10 -10

예제 출력 2

1

게임은 아래와 같이 진행된다.

  • 선공이 $1$번 표적을 맞히고 $1$점을 얻는다.
  • $2$번과 $3$번 표적이 떨어지고 후공은 $-20$점을 얻는다.
  • 모든 표적이 파괴되거나 떨어졌으므로 게임이 종료된다.

예제 입력 3

2
-3 4

예제 출력 3

1

게임은 아래와 같이 진행된다.

  • 선공이 $2$번 표적을 맞히고 $4$점을 얻는다.
  • 후공은 기권한다. 그 결과 선공이 $-3$점을 얻고, 게임이 즉시 종료된다.
[{"problem_id":"29199","problem_lang":"0","title":"\ud65c\uc3d8\uae30 \ub300\uacb0","description":"<p>\uc624\ub298\ub3c4 \ud3c9\ud654\ub85c\uc6b4 KSA \uc218\uc5c5 \uc2dc\uac04\uc5d0\uc11c\ub294 \ud65c\uc3d8\uae30 \ub300\uacb0\uc744 \ud55c\ub2e4. \ucd1d $N$\uac1c\uc758 \ud45c\uc801\uc774 \uc900\ube44\ub418\uc5b4 \uc788\ub2e4. \ud45c\uc801\ub4e4\uc740 \ub9e8 \uc704\uc5d0 \ud558\ub098\uac00 \uace0\uc815\ub418\uc5b4 \uc788\uace0 \uadf8 \uc544\ub798\ub85c \uc904\uc904\uc774 \ud558\ub098\uc529 \ub9e4\ub2ec\ub824 \uc788\ub2e4. \ud45c\uc801\uc758 \ubc88\ud638\ub294 $1$\ubd80\ud130 $N$\uae4c\uc9c0 \ub9e4\uaca8\uc838 \uc788\uc73c\uba70, \ub9e8 \uc704\uc758 \ud45c\uc801\uc774 $1$\ubc88\uc774\uace0, $i(1&lt;i\\leq N)$\ubc88 \ud45c\uc801\uc740 $i-1$\ubc88 \ud45c\uc801\uc5d0 \ub9e4\ub2ec\ub824 \uc788\ub2e4. $i$\ubc88 \ud45c\uc801\uc758 \uc810\uc218\ub294 $A_i$\uc774\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ud50c\ub808\uc774\uc5b4\uac00 \ubc88\uac08\uc544 \uac00\uba70 \ucc28\ub840\ub97c \uac00\uc9c0\uba70, \uc790\uc2e0\uc758 \ucc28\ub840\uac00 \ub418\uba74 \uc544\ub798 \ub450 \uac00\uc9c0 \ub3d9\uc791 \uc911 \ud558\ub098\ub97c \uc120\ud0dd\ud574\uc11c \ud560 \uc218 \uc788\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\ud45c\uc801 \ud558\ub098\ub97c \uc120\ud0dd\ud558\uace0 \ud65c\uc744 \uc3f4\uc11c \ub9de\ud78c\ub2e4.<\/li>\r\n\t<li>\uae30\uad8c\ud55c\ub2e4.<\/li>\r\n<\/ul>\r\n\r\n<p>\ud45c\uc801\uc744 \ud65c\ub85c \ub9de\ud788\uba74 \ud45c\uc801\uc774 \ud30c\uad34\ub418\uba70 \ud45c\uc801\uc758 \uc810\uc218\uac00 \ub9de\ud78c \uc0ac\ub78c\uc758 \uc810\uc218\uc5d0 \ud569\uc0b0\ub41c\ub2e4. \ud30c\uad34\ub41c \ud45c\uc801 \ubc11\uc5d0 \ub2ec\ub9b0 \ud45c\uc801\ub4e4\uc740 \ubc14\ub2e5\uc5d0 \ub5a8\uc5b4\uc9c0\uba70, \ub5a8\uc5b4\uc84c\uc9c0\ub9cc \ud30c\uad34\ub418\uc9c0 \uc54a\uc740 \ud45c\uc801\ub4e4\uc758 \uc810\uc218\ub294 \uc0c1\ub300\ubc29\uc758 \uc810\uc218\uc5d0 \ud569\uc0b0\ub41c\ub2e4. \uae30\uad8c\ud560 \uacbd\uc6b0, \ud30c\uad34\ub418\uc9c0 \uc54a\uace0 \ub5a8\uc5b4\uc9c0\uc9c0\ub3c4 \uc54a\uc740 \ubaa8\ub4e0 \ud45c\uc801\uc758 \uc810\uc218\uac00 \uc0c1\ub300\ubc29\uc758 \uc810\uc218\uc5d0 \ud569\uc0b0\ub418\uace0 \uc989\uc2dc \uac8c\uc784\uc774 \uc885\ub8cc\ub41c\ub2e4. \ubaa8\ub4e0 \ud45c\uc801\uc774 \ud30c\uad34\ub418\uac70\ub098 \ub5a8\uc5b4\uc9c4 \uacbd\uc6b0\uc5d0\ub3c4 \uac8c\uc784\uc774 \uc885\ub8cc\ub41c\ub2e4. \uc774\ubc88\uc5d0 \ucc38\uac00\ud560 \ub450 \ud559\uc0dd\uc740 \uc5c4\uccad\ub09c \uba85\uc0ac\uc218\ub77c\uc11c \uc120\ud0dd\ud55c \ud45c\uc801\uc744 \ubc18\ub4dc\uc2dc \ub9de\ud790 \uc218 \uc788\uc73c\uba70, \uc790\uc2e0\uc758 \uc810\uc218\ub97c \ucd5c\ub300\ud654\ud558\uae30 \uc704\ud574 \ucd5c\uc801\uc758 \uc120\ud0dd\ub9cc\uc744 \ud55c\ub2e4. \uac8c\uc784 \uacb0\uacfc\ub97c \uc608\uce21\ud574 \ubcf4\uc790.<\/p>\r\n","input":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0 \uc815\uc218 $N$\uc774 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc904\uc5d0 \uac01 \ud45c\uc801\uc758 \uc810\uc218\ub97c \ub098\ud0c0\ub0b4\ub294 $N$\uac1c\uc758 \uc815\uc218 $A_1, A_2, \\cdots, A_N$\uc774 \uacf5\ubc31\uc73c\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n","output":"<p>\uc120\uacf5\uc774 \uac00\uc838\uac08 \uc810\uc218\ub97c \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"","original":"1","html_title":"0","problem_lang_tcode":"Korean","limit":"<ul>\r\n\t<li>$1 \\leq N \\leq 2 \\times 10^5$<\/li>\r\n\t<li>$-10^9 \\leq A_i \\leq 10^9$<\/li>\r\n<\/ul>\r\n","subtask1":"<p>$N \\leq 1000$<\/p>\r\n","subtask2":"<p>$A_i \\ge 0$ $(1 \\le i \\le N)$<\/p>\r\n","subtask3":"<p>\ucd94\uac00 \uc81c\uc57d \uc870\uac74 \uc5c6\uc74c<\/p>\r\n","sample_explain_1":"<p>\uac8c\uc784\uc740 \uc544\ub798\uc640 \uac19\uc774 \uc9c4\ud589\ub41c\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\uc120\uacf5\uc774 $3$\ubc88 \ud45c\uc801\uc744 \ub9de\ud788\uace0 $100$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>\ud6c4\uacf5\uc774 $2$\ubc88 \ud45c\uc801\uc744 \ub9de\ud788\uace0 $10$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>\uc120\uacf5\uc774 $1$\ubc88 \ud45c\uc801\uc744 \ub9de\ud788\uace0 $1$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>\ubaa8\ub4e0 \ud45c\uc801\uc774 \ud30c\uad34\ub418\uac70\ub098 \ub5a8\uc5b4\uc84c\uc73c\ubbc0\ub85c \uac8c\uc784\uc774 \uc885\ub8cc\ub41c\ub2e4.<\/li>\r\n<\/ul>\r\n","sample_explain_2":"<p>\uac8c\uc784\uc740 \uc544\ub798\uc640 \uac19\uc774 \uc9c4\ud589\ub41c\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\uc120\uacf5\uc774 $1$\ubc88 \ud45c\uc801\uc744 \ub9de\ud788\uace0 $1$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>$2$\ubc88\uacfc $3$\ubc88 \ud45c\uc801\uc774 \ub5a8\uc5b4\uc9c0\uace0&nbsp;\ud6c4\uacf5\uc740 $-20$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>\ubaa8\ub4e0 \ud45c\uc801\uc774 \ud30c\uad34\ub418\uac70\ub098 \ub5a8\uc5b4\uc84c\uc73c\ubbc0\ub85c \uac8c\uc784\uc774 \uc885\ub8cc\ub41c\ub2e4.<\/li>\r\n<\/ul>\r\n","sample_explain_3":"<p>\uac8c\uc784\uc740 \uc544\ub798\uc640 \uac19\uc774 \uc9c4\ud589\ub41c\ub2e4.<\/p>\r\n\r\n<ul>\r\n\t<li>\uc120\uacf5\uc774 $2$\ubc88 \ud45c\uc801\uc744 \ub9de\ud788\uace0 $4$\uc810\uc744 \uc5bb\ub294\ub2e4.<\/li>\r\n\t<li>\ud6c4\uacf5\uc740 \uae30\uad8c\ud55c\ub2e4. \uadf8 \uacb0\uacfc \uc120\uacf5\uc774 $-3$\uc810\uc744 \uc5bb\uace0, \uac8c\uc784\uc774 \uc989\uc2dc \uc885\ub8cc\ub41c\ub2e4.<\/li>\r\n<\/ul>\r\n"},{"problem_id":"29199","problem_lang":"1","title":"Archery Duel","description":"<p>In today&#39;s peaceful KSA class, there is an archery duel. There are a total of $N$ targets prepared.&nbsp;The targets are lined up, one fixed at the top and the rest hanging below. The targets are numbered from $1$ to $N$, with the top target being number $1$, and&nbsp;target $i$ ($1&lt;i\\leq N$) is hanging from target $i-1$. The score of&nbsp;target $i$ is $A_i$.<\/p>\r\n\r\n<p>Two players&nbsp;alternately take turns, and they can choose one of the following two actions on their turn:<\/p>\r\n\r\n<ul>\r\n\t<li>Select one target and shoot an arrow to hit it.<\/li>\r\n\t<li>Surrender.<\/li>\r\n<\/ul>\r\n\r\n<p>When a target is hit, it is destroyed, and its score is added to the score of the player who hit it. The targets hanging below the destroyed target fall to the ground, and the scores of the targets that fell but were not destroyed are added to the score of the opponent. If a player surrenders, the scores of all the targets that were neither destroyed nor fell are added to the opponent&#39;s score, and the game ends immediately. The game also ends if every target is destroyed or fallen.&nbsp;The two students participating in this game are exceptional archers and will always hit the target they choose, making the optimal choices to maximize their own scores. Let&#39;s predict the outcome of the game.<\/p>\r\n","input":"<p>The first line contains an integer $N$.<\/p>\r\n\r\n<p>The second line contains $N$ integers $A_1, A_2, \\cdots, A_N$ separated by a space,&nbsp;representing the scores of the targets.<\/p>\r\n","output":"<p>Print the score obtained by the player who goes first.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English","limit":"<ul>\r\n\t<li>$1 \\leq N \\leq 2 \\times 10^5$<\/li>\r\n\t<li>$-10^9 \\leq A_i \\leq 10^9$<\/li>\r\n<\/ul>\r\n","subtask1":"<p>$N \\leq 1000$<\/p>\r\n","subtask2":"<p>$A_i \\ge 0$ $(1 \\le i \\le N)$<\/p>\r\n","subtask3":"<p>No additional constraints<\/p>\r\n","sample_explain_1":"<p>The game proceeds as follows:<\/p>\r\n\r\n<ul>\r\n\t<li>The first player hits the target $3$ and earns $100$ points.<\/li>\r\n\t<li>The second player hits the target $2$ and earns $10$ points.<\/li>\r\n\t<li>The first player hits the target $1$ and earns $1$ point.<\/li>\r\n\t<li>Since all targets are destroyed or have fallen, the game ends.<\/li>\r\n<\/ul>\r\n","sample_explain_2":"<p>The game proceeds as follows:<\/p>\r\n\r\n<ul>\r\n\t<li>The first player hits the target $1$ and earns $1$ point.<\/li>\r\n\t<li>Target&nbsp;$2$ and target $3$ fall, and the second player earns $-20$ points.<\/li>\r\n\t<li>Since all targets are destroyed or have fallen, the game ends.<\/li>\r\n<\/ul>\r\n","sample_explain_3":"<p>The game proceeds as follows:<\/p>\r\n\r\n<ul>\r\n\t<li>The first player hits the target $2$ and earns $4$ points.<\/li>\r\n\t<li>The second player surrenders. The first player earns $-3$ points, and&nbsp;the game ends immediately.<\/li>\r\n<\/ul>\r\n"}]

채점 및 기타 정보

  • 예제는 채점하지 않는다.