Finished PE 94, a tale of floats and integers

projecteuler/094/Cargo.toml

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+[package]
+name = "main"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

projecteuler/094/src/main.rs

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+use std::time::Instant;
+
+fn check_triangle(two_sides: u64, one_side: u64) -> bool {
+    let c = 4 * two_sides * two_sides - one_side * one_side;
+    let r = (c as f64).sqrt() as u64;
+
+    //    println!("{} {}", two_sides, r);
+    return r * r == c && r > 0;
+}
+
+fn main() {
+    println!("Hello, this is Patrick!");
+    let now = Instant::now();
+
+    const MAX_PERIMETER: u64 = 1000000000;
+
+    let mut perimeter_sum = 0;
+
+    let mut i = 1;
+    loop {
+        if 3 * i - 1 > MAX_PERIMETER {
+            break;
+        }
+        // First check the case where the single side is equal to i - 1
+        if i > 1 && check_triangle(i, i - 1) {
+            perimeter_sum += 3 * i - 1;
+        }
+
+        // Then check the case where the single side is equal to i + 1
+        if 3 * i + 1 <= MAX_PERIMETER && check_triangle(i, i + 1) {
+            perimeter_sum += 3 * i + 1;
+        }
+
+        i += 1;
+    }
+
+    println!(
+        "Sum of perimeters of almost equilateral triangles with integral side is: {}",
+        perimeter_sum
+    );
+    println!("Time passed: {:?}", Instant::now() - now);
+}
+
+#[test]
+fn check() {
+    assert!(check_triangle(5, 6));
+}