CF463C.Gargari and Bishops

普及+/提高

通过率:0%

时间限制:3.00s

内存限制:256MB

AC君温馨提醒

该题目为【codeforces】题库的题目,您提交的代码将被提交至codeforces进行远程评测,并由ACGO抓取测评结果后进行展示。由于远程测评的测评机由其他平台提供,我们无法保证该服务的稳定性,若提交后无反应,请等待一段时间后再进行重试。

题目描述

Gargari is jealous that his friend Caisa won the game from the previous problem. He wants to prove that he is a genius.

He has a n × n chessboard. Each cell of the chessboard has a number written on it. Gargari wants to place two bishops on the chessboard in such a way that there is no cell that is attacked by both of them. Consider a cell with number x written on it, if this cell is attacked by one of the bishops Gargari will get x dollars for it. Tell Gargari, how to place bishops on the chessboard to get maximum amount of money.

We assume a cell is attacked by a bishop, if the cell is located on the same diagonal with the bishop (the cell, where the bishop is, also considered attacked by it).

加尔加里嫉妒他的朋友凯萨在上一题中赢得了游戏,他想证明自己是个天才。

他有一个 n×nn \times n 的国际象棋棋盘,棋盘的每个格子上都写有一个数字。加尔加里希望在棋盘上放置两个主教(象),使得不存在任何一个格子同时被这两个主教攻击。考虑一个写有数字 xx 的格子:若该格子被其中一个主教攻击,则加尔加里将获得 xx 美元。请告诉加尔加里,应如何在棋盘上放置这两个主教,才能使他获得的钱数最多。

我们规定:若一个格子与某个主教位于同一条对角线上,则该格子被该主教攻击(主教所在的格子本身也被视为被其攻击)。

输入格式

The first line contains a single integer n (2 ≤ n ≤ 2000). Each of the next n lines contains n integers a__ij (0 ≤ a__ij ≤ 109) — description of the chessboard.

第一行包含一个整数 nn(2≤n≤20002 \leq n \leq 2000)。接下来的 nn 行,每行包含 nn 个整数 aija_{ij}(0≤aij≤1090 \leq a_{ij} \leq 10^9),表示棋盘的描述。

输出格式

On the first line print the maximal number of dollars Gargari will get. On the next line print four integers: _x_1, _y_1, _x_2, _y_2 (1 ≤ _x_1, _y_1, _x_2, _y_2 ≤ n), where x__i is the number of the row where the i-th bishop should be placed, y__i is the number of the column where the i-th bishop should be placed. Consider rows are numbered from 1 to n from top to bottom, and columns are numbered from 1 to n from left to right.

If there are several optimal solutions, you can print any of them.

第一行输出 Gargari 能获得的最大美元数。
第二行输出四个整数:x1, y1, x2, y2x_1,\ y_1,\ x_2,\ y_2(其中 1≤x1,y1,x2,y2≤n1 \le x_1, y_1, x_2, y_2 \le n),分别表示第 ii 个主教应放置的行号 xix_i 和列号 yiy_i。行号从上到下编号为 11 到 nn,列号从左到右编号为 11 到 nn。

若存在多个最优解,输出任意一个即可。

输入输出样例

  • 输入#1

    4
    1 1 1 1
    2 1 1 0
    1 1 1 0
    1 0 0 1

    输出#1

    12
    2 2 3 2

输入解题思路,AI测评打分。不知道怎么写?

首页