ishan/aoc2021
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Added Day 17 Part 2

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This commit is contained in:
Ishan Jain 2021-12-17 12:26:47 +05:30
parent a2cafe726c
commit abf797fd6e
1 changed files with 7 additions and 14 deletions
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21
src/main.rs
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@ -29,29 +29,22 @@ fn parse(input: &'static str) -> (RangeInclusive<i32>, RangeInclusive<i32>) {
(sx..=ex, sy..=ey)
}
fn check(
mut vx: i32,
mut vy: i32,
(tx, ty): (RangeInclusive<i32>, RangeInclusive<i32>),
) -> Option<i32> {
fn check(mut vx: i32, mut vy: i32, (tx, ty): (RangeInclusive<i32>, RangeInclusive<i32>)) -> bool {
let mut sx = 0;
let mut sy = 0;
let mut y_max = 0;
loop {
if vx == 0 && sy < *ty.start() {
return None;
return false;
}
if tx.contains(&sx) && ty.contains(&sy) {
return Some(y_max);
return true;
}
sx += vx;
sy += vy;
y_max = y_max.max(sy);
vy -= 1;
vx -= if vx > 0 {
1
@ -64,16 +57,16 @@ fn check(
}
fn solution((xr, yr): (RangeInclusive<i32>, RangeInclusive<i32>)) -> i32 {
let mut y_max = 0;
let mut count = 0;
for x in 0..250 {
for y in -250..=250 {
if let Some(lymax) = check(x, y, (xr.clone(), yr.clone())) {
y_max = y_max.max(lymax);
if check(x, y, (xr.clone(), yr.clone())) {
count += 1;
}
}
}
y_max
count
}
fn main() {