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impl Solution {
pub fn max_value_after_reverse(nums: Vec<i32>) -> i32 {
let n = nums.len();
let mut total: i64 = 0;
let mut gain: i64 = 0;
let mut min_of_max: i64 = 200001;
let mut max_of_min: i64 = -200001;
let mut i: usize = 0;
while i < n - 1 {
let a = nums[i] as i64;
let b = nums[i + 1] as i64;
let diff: i64 = if a >= b { a - b } else { b - a };
total = total + diff;
let first = nums[0] as i64;
let last = nums[n - 1] as i64;
let g1: i64 = (if first >= b { first - b } else { b - first }) - diff;
let g2: i64 = (if last >= a { last - a } else { a - last }) - diff;
if g1 > gain {
gain = g1;
}
if g2 > gain {
gain = g2;
}
let pair_max: i64 = if a >= b { a } else { b };
let pair_min: i64 = if a <= b { a } else { b };
if pair_max < min_of_max {
min_of_max = pair_max;
}
if pair_min > max_of_min {
max_of_min = pair_min;
}
i = i + 1;
}
let interior: i64 = if max_of_min > min_of_max {
2 * (max_of_min - min_of_max)
} else {
0
};
if interior > gain {
gain = interior;
}
(total + gain) as i32
}
}