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impl Solution {
pub fn max_score(card_points: Vec<i32>, k: i32) -> i32
{
let n = card_points.len();
let k = k as usize;
let mut left_sum = 0i32;
let mut right_sum = 0i32;
let mut i = 0usize;
while i < k
{
left_sum = left_sum + card_points[i];
i = i + 1;
}
let mut best = left_sum;
let mut i = 0usize;
while i < k
{
let left_card_idx = k - 1 - i;
let right_card_idx = n - 1 - i;
left_sum = left_sum - card_points[left_card_idx];
right_sum = right_sum + card_points[right_card_idx];
let score = left_sum + right_sum;
if left_sum + right_sum > best {
best = left_sum + right_sum;
}
i = i + 1;
}
best
}
}