20241018 finished.

src/problem/mod.rs

@@ -267,3 +267,4 @@ mod p887_super_egg_drop;
 mod p3200_maximum_height_of_a_triangle;
 mod p3194_minimum_average_of_smallest_and_largest_elements;
 mod p3193_count_the_number_of_inversions;
+mod p3191_minimum_operations_to_make_binary_array_elements_equal_to_one_i;

src/problem/p3191_minimum_operations_to_make_binary_array_elements_equal_to_one_i.rs

@@ -0,0 +1,62 @@
+/**
+ * [3191] Minimum Operations to Make Binary Array Elements Equal to One I
+ */
+pub struct Solution {}
+
+
+// submission codes start here
+
+impl Solution {
+    pub fn min_operations(nums: Vec<i32>) -> i32 {
+        let mut result = 0;
+        let mut nums = nums;
+
+        let mut pos = 0;
+
+        while pos < nums.len() - 3 {
+            if nums[pos] == 1 {
+                pos += 1;
+                continue;
+            }
+
+            nums[pos] = 1;
+            Self::reverse(pos + 1, &mut nums);
+            Self::reverse(pos + 2, &mut nums);
+
+            result += 1;
+            pos += 1;
+        }
+
+        if nums[pos] ^ nums[pos + 1] == 0 && nums[pos + 1] ^ nums[pos + 2] == 0 {
+            if nums[pos] == 1 {
+                result
+            } else {
+                result + 1
+            }
+        } else {
+            -1
+        }
+    }
+
+    fn reverse(pos: usize, nums: &mut Vec<i32>) {
+        nums[pos] = if nums[pos] == 1 {
+            0
+        } else {
+            1
+        }
+    }
+}
+
+// submission codes end
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_3191() {
+        assert_eq!(-1, Solution::min_operations(vec![0, 1, 1, 0, 1, 0, 0]));
+        assert_eq!(3, Solution::min_operations(vec![0, 1, 1, 1, 0, 0]));
+        assert_eq!(-1, Solution::min_operations(vec![0, 1, 1, 1]));
+    }
+}