20241115 finished.

src/problem/mod.rs

@@ -316,3 +316,5 @@ mod p3258_count_substrings_that_satisfy_k_constraint_i;
 mod p3261_count_substrings_that_satisfy_k_constraint_ii;
 
 mod p3249_count_the_number_of_good_nodes;
+
+mod p3239_minimum_number_of_flips_to_make_binary_grid_palindromic_i;

src/problem/p3239_minimum_number_of_flips_to_make_binary_grid_palindromic_i.rs

@@ -0,0 +1,52 @@
+/**
+ * [3239] Minimum Number of Flips to Make Binary Grid Palindromic I
+ */
+pub struct Solution {}
+
+// submission codes start here
+
+impl Solution {
+    pub fn min_flips(grid: Vec<Vec<i32>>) -> i32 {
+        let (m, n) = (grid.len(), grid[0].len());
+        let mut row = 0;
+
+        for i in 0..m {
+            for j in 0..n / 2 {
+                if grid[i][j] != grid[i][n - j - 1] {
+                    row += 1;
+                }
+            }
+        }
+
+        let mut column = 0;
+
+        for i in 0..n {
+            for j in 0..m / 2 {
+                if grid[j][i] != grid[m - j - 1][i] {
+                    column += 1;
+                }
+            }
+        }
+
+        row.min(column)
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3239() {
+        assert_eq!(
+            2,
+            Solution::min_flips(vec![vec![1, 0, 0], vec![0, 0, 0], vec![0, 0, 1]])
+        );
+        assert_eq!(
+            1,
+            Solution::min_flips(vec![vec![0, 1], vec![0, 1], vec![0, 0]])
+        );
+    }
+}