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2026-02-04 11:15:03 +08:00
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fn main() {
let matrix = [
[
8, 2, 22, 97, 38, 15, 00, 40, 00, 75, 4, 5, 7, 78, 52, 12, 50, 77, 91, 8,
],
[
49, 49, 99, 40, 17, 81, 18, 57, 60, 87, 17, 40, 98, 43, 69, 48, 4, 56, 62, 00,
],
[
81, 49, 31, 73, 55, 79, 14, 29, 93, 71, 40, 67, 53, 88, 30, 3, 49, 13, 36, 65,
],
[
52, 70, 95, 23, 4, 60, 11, 42, 69, 24, 68, 56, 1, 32, 56, 71, 37, 2, 36, 91,
],
[
22, 31, 16, 71, 51, 67, 63, 89, 41, 92, 36, 54, 22, 40, 40, 28, 66, 33, 13, 80,
],
[
24, 47, 32, 60, 99, 3, 45, 2, 44, 75, 33, 53, 78, 36, 84, 20, 35, 17, 12, 50,
],
[
32, 98, 81, 28, 64, 23, 67, 10, 26, 38, 40, 67, 59, 54, 70, 66, 18, 38, 64, 70,
],
[
67, 26, 20, 68, 2, 62, 12, 20, 95, 63, 94, 39, 63, 8, 40, 91, 66, 49, 94, 21,
],
[
24, 55, 58, 5, 66, 73, 99, 26, 97, 17, 78, 78, 96, 83, 14, 88, 34, 89, 63, 72,
],
[
21, 36, 23, 9, 75, 00, 76, 44, 20, 45, 35, 14, 0, 61, 33, 97, 34, 31, 33, 95,
],
[
78, 17, 53, 28, 22, 75, 31, 67, 15, 94, 3, 80, 4, 62, 16, 14, 9, 53, 56, 92,
],
[
16, 39, 5, 42, 96, 35, 31, 47, 55, 58, 88, 24, 00, 17, 54, 24, 36, 29, 85, 57,
],
[
86, 56, 00, 48, 35, 71, 89, 7, 5, 44, 44, 37, 44, 60, 21, 58, 51, 54, 17, 58,
],
[
19, 80, 81, 68, 5, 94, 47, 69, 28, 73, 92, 13, 86, 52, 17, 77, 4, 89, 55, 40,
],
[
4, 52, 8, 83, 97, 35, 99, 16, 7, 97, 57, 32, 16, 26, 26, 79, 33, 27, 98, 66,
],
[
88, 36, 68, 87, 57, 62, 20, 72, 3, 46, 33, 67, 46, 55, 12, 32, 63, 93, 53, 69,
],
[
4, 42, 16, 73, 38, 25, 39, 11, 24, 94, 72, 18, 8, 46, 29, 32, 40, 62, 76, 36,
],
[
20, 69, 36, 41, 72, 30, 23, 88, 34, 62, 99, 69, 82, 67, 59, 85, 74, 4, 36, 16,
],
[
20, 73, 35, 29, 78, 31, 90, 1, 74, 31, 49, 71, 48, 86, 81, 16, 23, 57, 5, 54,
],
[
1, 70, 54, 71, 83, 51, 54, 69, 16, 92, 33, 48, 61, 43, 52, 1, 89, 19, 67, 48,
],
];
let mut max = 0;
// 横向
for row in matrix {
for window in row.windows(4) {
let result = window.iter().product();
if result > max {
max = result;
}
}
}
// 竖向
for col in 0..matrix[0].len() {
for start_row in 0..=matrix.len().saturating_sub(4) {
let result: i32 = (start_row..start_row + 4)
.map(|row| matrix[row][col])
.product();
if result > max {
max = result;
}
}
}
// 左上至右下对角线
for d in 0..(matrix.len() + matrix[0].len() - 1) {
let mut diagonal = Vec::new();
// 计算对角线起始点
let start_row = if d < matrix[0].len() {
0
} else {
d - matrix[0].len() + 1
};
let start_col = if d < matrix[0].len() {
matrix[0].len() - 1 - d
} else {
0
};
// 收集对角线元素
let mut row = start_row;
let mut col = start_col;
while row < matrix.len() && col < matrix[0].len() {
diagonal.push(matrix[row][col]);
row += 1;
col += 1;
}
// 滑动窗口
for window in diagonal.windows(4) {
let result: i32 = window.iter().product();
if result > max {
max = result;
}
}
}
// 右上至左下对角线
for d in 0..(matrix.len() + matrix[0].len() - 1) {
let mut diagonal = Vec::new();
// 计算对角线起始点
let start_row = if d < matrix.len() {
d
} else {
matrix.len() - 1
};
let start_col = if d < matrix.len() {
0
} else {
d - matrix.len() + 1
};
// 收集对角线元素
let mut row = start_row;
let mut col = start_col;
while row < matrix.len() && col < matrix[0].len() {
diagonal.push(matrix[row][col]);
if row == 0 {
break;
}
row -= 1;
col += 1;
}
// 滑动窗口
for window in diagonal.windows(4) {
let result: i32 = window.iter().product();
if result > max {
max = result;
}
}
}
println!("max: {max}");
}