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finish day 7

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Victor Martinez Montane 2022-05-12 23:26:28 +02:00
commit 50cb5ba268
1 changed files with 6 additions and 1 deletions
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day7/src/main.rs
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@ -26,7 +26,12 @@ fn optimal_alignment_position(positions: &[i32]) -> (i32, i32) {
fn calculate_alignment_fuel_cost(align_to: i32, positions: &[i32]) -> i32 { fn calculate_alignment_fuel_cost(align_to: i32, positions: &[i32]) -> i32 {
positions positions
.into_iter() .into_iter()
.map(|pos| i32::abs(align_to - pos)) // Get the distance between the 2 positions
.map(|pos| align_to - pos)
// Transform into absolute distance
.map(i32::abs)
// Calculate sum from 0 to n
.map(|n| n * (n + 1) / 2)
.sum() .sum()
} }