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문제

2차원 평면에서 보통 사용되는 거리 체계는 유클리드(Euclid) 거리다. 유클리드 거리에서 두 점 $(x_1, y_1)$과 $(x_2, y_2)$사이의 거리는 $\sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}$로 나타낸다.

이 문제에서는 유클리드 거리 대신 체비쇼프(Chebyshev) 거리를 다룬다. 체비쇼프 거리에서 $(x_1, y_1)$과 $(x_2, y_2)$사이의 거리는 $\max{(|x_1 - x_2|, |y_1 - y_2|)}$로 나타낸다.

어떤 거리 체계에 대하여 반지름이 $r$인 은 특정한 점 $(x_c, y_c)$와의 거리가 $r$인 점 $(x,y)$의 집합이다. 원의 형태는 어떤 거리 체계를 쓰느냐 에 따라 다른데, (그림 1)에서 보이듯 유클리드 거리에서는 우리가 보통 아는 원형이고, 체비쇼프 거리에서는 한 변의 길이가 $2r$인 정사각형이 원이 된다.

그림 1 : 유클리드 거리와 체비쇼프 거리에서의 원

또한, 어떤 거리 체계에 대하여 안쪽 반지름이 $l$이고, 바깥쪽 반지름이 $r$인 도넛은 특정한 점 $(x_c, y_c)$와의 거리가 $l$이상 $r$이하인 점 $(x,y)$들의 집합이다.

(그림 2)에서 왼쪽은 유클리드 거리에서의 도넛이고, 오른쪽은 체비쇼프 거리에서의 도넛이다. 회색 영역이 도넛에 포함된 영역이다.

그림 2 : 유클리드 거리와 체비쇼프 거리에서의 도넛

범수는 $N$개의 점 $P_1$, $P_2$, $\cdots$, $P_N$과 체비쇼프 거리에서의 안쪽 반지름이 $L$이고 바깥쪽 반지름이 $R$인 도넛을 가지고 놀고 있다. $P_i$는 $(x_i, y_i)$에 위치하며, 도넛중심의 위치는 중심의 좌표를 격자점에 두는 것만 지키면, 범수가 마음껏 바꿀 수 있다. 만약 $P_i$가 도넛 영역에 들어가 있다면, 범수는 강제적으로 $S_i$점을 얻게 되고, 도넛 영역에 들어가 있지 않다면 아무 점수도 얻지 않는다. 이 때, 범수가 얻을 수 있는 점수의 최댓값을 구하는 프로그램을 작성하라.

입력

입력의 첫 번째 줄에는 세 정수 $N$, $L$, $R$($1 ≤ N ≤ 10^5$, $1 ≤ L ≤ R ≤ 10^9$)이 공백 하나로 구분되어 주어진다.

다음 $N$개의 줄의 $i$번째 줄에는 $x_i$, $y_i$, $S_i$($-10^9 ≤ x_i, y_i ≤ 10^9$, $-10^4 ≤ S_i ≤ 10^4$)가 공백 하나로 구분되어 주어진다. 같은 위치에 여러 점이 있을 수 있다.

출력

첫 번째 줄에 범수가 얻을 수 있는 점수의 최댓값을 출력한다.

예제 입력 1

4 1 1
0 1 1
0 -1 1
1 0 -100
-1 0 -100

예제 출력 1

2

예제 입력 2

4 1 2
0 1 1
0 -1 1
1 0 -100
-1 0 -100

예제 출력 2

1

힌트

첫 번째 예제는 도넛의 중심을 $(1,0)$이나 $(-1,0)$에 두면 된다.

두 번째 예제는 도넛이 너무 커졌기 때문에, $-100$을 피해서 $1$하나를 포함 시키는 것이 최적이다.

[{"problem_id":"19291","problem_lang":"0","title":"Donut-shaped Enclosure","description":"<p>2\ucc28\uc6d0 \ud3c9\uba74\uc5d0\uc11c \ubcf4\ud1b5 \uc0ac\uc6a9\ub418\ub294 \uac70\ub9ac \uccb4\uacc4\ub294 \uc720\ud074\ub9ac\ub4dc(Euclid) \uac70\ub9ac\ub2e4. \uc720\ud074\ub9ac\ub4dc&nbsp;\uac70\ub9ac\uc5d0\uc11c \ub450 \uc810 $(x_1, y_1)$\uacfc $(x_2, y_2)$\uc0ac\uc774\uc758 \uac70\ub9ac\ub294 $\\sqrt{(x_1 - x_2)^2 + (y_1 - y_2)^2}$\ub85c \ub098\ud0c0\ub0b8\ub2e4.<\/p>\r\n\r\n<p>\uc774 \ubb38\uc81c\uc5d0\uc11c\ub294 \uc720\ud074\ub9ac\ub4dc \uac70\ub9ac \ub300\uc2e0 \uccb4\ube44\uc1fc\ud504(Chebyshev) \uac70\ub9ac\ub97c \ub2e4\ub8ec\ub2e4. \uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c $(x_1, y_1)$\uacfc $(x_2, y_2)$\uc0ac\uc774\uc758 \uac70\ub9ac\ub294 $\\max{(|x_1 - x_2|, |y_1 - y_2|)}$\ub85c \ub098\ud0c0\ub0b8\ub2e4.<\/p>\r\n\r\n<p>\uc5b4\ub5a4 \uac70\ub9ac \uccb4\uacc4\uc5d0 \ub300\ud558\uc5ec \ubc18\uc9c0\ub984\uc774 $r$\uc778 <strong>\uc6d0<\/strong>\uc740 \ud2b9\uc815\ud55c \uc810 $(x_c, y_c)$\uc640\uc758 \uac70\ub9ac\uac00 $r$\uc778 \uc810 $(x,y)$\uc758 \uc9d1\ud569\uc774\ub2e4. \uc6d0\uc758 \ud615\ud0dc\ub294 \uc5b4\ub5a4 \uac70\ub9ac \uccb4\uacc4\ub97c \uc4f0\ub290\ub0d0 \uc5d0 \ub530\ub77c \ub2e4\ub978\ub370, (\uadf8\ub9bc 1)\uc5d0\uc11c \ubcf4\uc774\ub4ef \uc720\ud074\ub9ac\ub4dc \uac70\ub9ac\uc5d0\uc11c\ub294 \uc6b0\ub9ac\uac00 \ubcf4\ud1b5 \uc544\ub294 \uc6d0\ud615\uc774\uace0,&nbsp;\uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c\ub294 \ud55c \ubcc0\uc758 \uae38\uc774\uac00 $2r$\uc778&nbsp;\uc815\uc0ac\uac01\ud615\uc774 \uc6d0\uc774 \ub41c\ub2e4.<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"https:\/\/upload.acmicpc.net\/4d17ac73-65d2-4b10-9c45-97f74b9bae77\/-\/preview\/\" style=\"width: 361px; height: 183px;\" \/><\/p>\r\n\r\n<p style=\"text-align: center;\">\uadf8\ub9bc 1 : \uc720\ud074\ub9ac\ub4dc \uac70\ub9ac\uc640 \uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c\uc758 \uc6d0<\/p>\r\n\r\n<p>\ub610\ud55c, \uc5b4\ub5a4 \uac70\ub9ac \uccb4\uacc4\uc5d0 \ub300\ud558\uc5ec \uc548\ucabd \ubc18\uc9c0\ub984\uc774 $l$\uc774\uace0, \ubc14\uae65\ucabd \ubc18\uc9c0\ub984\uc774 $r$\uc778 <strong>\ub3c4\ub11b<\/strong>\uc740 \ud2b9\uc815\ud55c \uc810 $(x_c, y_c)$\uc640\uc758 \uac70\ub9ac\uac00 $l$\uc774\uc0c1 $r$\uc774\ud558\uc778 \uc810 $(x,y)$\ub4e4\uc758 \uc9d1\ud569\uc774\ub2e4.<\/p>\r\n\r\n<p>(\uadf8\ub9bc 2)\uc5d0\uc11c \uc67c\ucabd\uc740 \uc720\ud074\ub9ac\ub4dc \uac70\ub9ac\uc5d0\uc11c\uc758 \ub3c4\ub11b\uc774\uace0, \uc624\ub978\ucabd\uc740 \uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c\uc758 \ub3c4\ub11b\uc774\ub2e4. \ud68c\uc0c9 \uc601\uc5ed\uc774 \ub3c4\ub11b\uc5d0 \ud3ec\ud568\ub41c \uc601\uc5ed\uc774\ub2e4.<\/p>\r\n\r\n<p style=\"text-align: center;\"><img alt=\"\" src=\"https:\/\/upload.acmicpc.net\/cb7a2af0-7066-406c-8118-71e69b10ec5a\/-\/preview\/\" style=\"width: 383px; height: 196px;\" \/><\/p>\r\n\r\n<p style=\"text-align: center;\">\uadf8\ub9bc 2 : \uc720\ud074\ub9ac\ub4dc \uac70\ub9ac\uc640 \uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c\uc758 \ub3c4\ub11b<\/p>\r\n\r\n<p>\ubc94\uc218\ub294 $N$\uac1c\uc758 \uc810 $P_1$, $P_2$, $\\cdots$, $P_N$\uacfc \uccb4\ube44\uc1fc\ud504 \uac70\ub9ac\uc5d0\uc11c\uc758 \uc548\ucabd \ubc18\uc9c0\ub984\uc774 $L$\uc774\uace0 \ubc14\uae65\ucabd \ubc18\uc9c0\ub984\uc774 $R$\uc778 \ub3c4\ub11b\uc744 \uac00\uc9c0\uace0 \ub180\uace0 \uc788\ub2e4. $P_i$\ub294 $(x_i, y_i)$\uc5d0 \uc704\uce58\ud558\uba70, \ub3c4\ub11b\uc911\uc2ec\uc758 \uc704\uce58\ub294 \uc911\uc2ec\uc758 \uc88c\ud45c\ub97c \uaca9\uc790\uc810\uc5d0 \ub450\ub294 \uac83\ub9cc \uc9c0\ud0a4\uba74, \ubc94\uc218\uac00 \ub9c8\uc74c\uaecf \ubc14\uafc0 \uc218 \uc788\ub2e4. \ub9cc\uc57d $P_i$\uac00&nbsp;\ub3c4\ub11b \uc601\uc5ed\uc5d0 \ub4e4\uc5b4\uac00 \uc788\ub2e4\uba74, \ubc94\uc218\ub294 \uac15\uc81c\uc801\uc73c\ub85c $S_i$\uc810\uc744 \uc5bb\uac8c \ub418\uace0, \ub3c4\ub11b \uc601\uc5ed\uc5d0 \ub4e4\uc5b4\uac00 \uc788\uc9c0 \uc54a\ub2e4\uba74 \uc544\ubb34 \uc810\uc218\ub3c4 \uc5bb\uc9c0 \uc54a\ub294\ub2e4. \uc774 \ub54c,&nbsp;\ubc94\uc218\uac00 \uc5bb\uc744 \uc218 \uc788\ub294 \uc810\uc218\uc758 \ucd5c\ub313\uac12\uc744 \uad6c\ud558\ub294 \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud558\ub77c.<\/p>\r\n","input":"<p>\uc785\ub825\uc758 \uccab \ubc88\uc9f8 \uc904\uc5d0\ub294 \uc138 \uc815\uc218 $N$, $L$, $R$($1 &le; N &le; 10^5$, $1 &le; L &le; R &le; 10^9$)\uc774 \uacf5\ubc31 \ud558\ub098\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4.<\/p>\r\n\r\n<p>\ub2e4\uc74c $N$\uac1c\uc758 \uc904\uc758 $i$\ubc88\uc9f8 \uc904\uc5d0\ub294 $x_i$, $y_i$, $S_i$($-10^9 &le; x_i, y_i &le; 10^9$, $-10^4 &le; S_i &le; 10^4$)\uac00&nbsp;\uacf5\ubc31 \ud558\ub098\ub85c \uad6c\ubd84\ub418\uc5b4 \uc8fc\uc5b4\uc9c4\ub2e4. \uac19\uc740 \uc704\uce58\uc5d0 \uc5ec\ub7ec \uc810\uc774 \uc788\uc744 \uc218 \uc788\ub2e4.<\/p>\r\n","output":"<p>\uccab \ubc88\uc9f8 \uc904\uc5d0 \ubc94\uc218\uac00 \uc5bb\uc744 \uc218 \uc788\ub294 \uc810\uc218\uc758 \ucd5c\ub313\uac12\uc744 \ucd9c\ub825\ud55c\ub2e4.<\/p>\r\n","hint":"<p>\uccab \ubc88\uc9f8 \uc608\uc81c\ub294 \ub3c4\ub11b\uc758 \uc911\uc2ec\uc744 $(1,0)$\uc774\ub098 $(-1,0)$\uc5d0 \ub450\uba74 \ub41c\ub2e4.<\/p>\r\n\r\n<p>\ub450 \ubc88\uc9f8 \uc608\uc81c\ub294 \ub3c4\ub11b\uc774 \ub108\ubb34 \ucee4\uc84c\uae30 \ub54c\ubb38\uc5d0, $-100$\uc744 \ud53c\ud574\uc11c $1$\ud558\ub098\ub97c \ud3ec\ud568 \uc2dc\ud0a4\ub294 \uac83\uc774 \ucd5c\uc801\uc774\ub2e4.<\/p>\r\n","original":"1","html_title":"0","problem_lang_tcode":"Korean"},{"problem_id":"19291","problem_lang":"1","title":"Donut","description":"<p>In this problem, we will use Chebyshev distance on a Cartesian plane. The Chebyshev distance between two points $(p_x,p_y)$ and $(q_x,q_y)$ on the plane is $\\max{\\big(|p_x-q_x|,|p_y-q_y|\\big)}$.<\/p>\r\n\r\n<p>Let us define a <strong>donut<\/strong>&nbsp;on the plane as the set of points in a certain distance range from a certain point, the donut&#39;s center. More formally, the donut with center $(x_c,y_c)$, inner radius $l$ and outer radius $r$ is the set of points $(x,y)$ such that $l \\leq \\max{\\big(|x-x_c|,|y-y_c|\\big)} \\leq r$.<\/p>\r\n\r\n<p>There are $n$ points selected on the Cartesian plane. Points are numbered from $1$ to $n$, and each point has a score associated with it.<\/p>\r\n\r\n<p>We want to place a donut on the plane. The inner radius of the donut will be $l$, the outer radius will be $r$, and the center of the donut is not yet determined: you have to decide where to place it. However, both coordinates of the center must be integers. After you place the donut, its score will be the sum of the scores of points which belong to the donut.<\/p>\r\n\r\n<p>You are given the coordinates of the selected points and the score associated with each point. Calculate the maximum possible score of the donut you can place.<\/p>\r\n","input":"<p>The first line contains three integers: $n$, the number of selected points on the plane, $l$, the inner radius of the donut, and $r$, the outer radius of the donut ($1 \\leq n \\leq 10^5$, $1 \\leq l \\leq r \\leq 10^9$).<\/p>\r\n\r\n<p>The following $n$ lines describes selected points, one per line. Each of these lines contains three integers $x$, $y$, and $s$: the coordinates of the point and the score associated with it ($-10^9 \\leq x, y \\leq 10^9$, $-10^4 \\leq s \\leq 10^4$). Note that some points may coincide.<\/p>\r\n","output":"<p>Print the maximum score of the donut.<\/p>\r\n","hint":"","original":"0","html_title":"0","problem_lang_tcode":"English"}]