题目描述
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样例
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算法1
(暴力枚举) $O(n^2)$
blablabla
时间复杂度
参考文献
C++ 代码
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算法2
(暴力枚举) $O(n^2)$
blablabla
时间复杂度
参考文献
C++ 代码
blablabla
import java.util.Scanner;
class Main{
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[][] matrix = new int[n][n];
for (int i = 0; i < n; i) {
for (int j = 0; j < n; j) {
matrix[i][j] = sc.nextInt();
}
}
int[][] grid = new int[n + 1][n + 1];
for (int i = 1; i <= n; i) {
for (int j = 1; j <= n; j) {
grid[i][j] = grid[i - 1][j] + matrix[i - 1][j - 1];
}
}
int res = Integer.MIN_VALUE;
for (int j = 1; j <= n; j) {
for (int i = 0; i < j; i) {
int pre = 0;
for (int col = 1; col <= n; col++) {
int cur = grid[j][col] - grid[i][col];
pre = Math.max(cur, pre + cur);
res = Math.max(res, pre);
}
}
}
System.out.print(res);
}
}