Add an example for ABC168-C

qryxip · qryxip · commit 69a4c44286c0 · 2020-05-19T00:20:11.000+09:00
diff --git a/examples/abc168-c.rs b/examples/abc168-c.rs
@@ -0,0 +1,34 @@
+// https://atcoder.jp/contests/abc168/tasks/abc168_c
+//
+// 以下のクレートを使用。
+// - `num`
+//     - `num-complex`
+// - `proconio`
+
+use num::Complex;
+use proconio::input;
+use std::f64::consts::PI;
+
+fn main() {
+    // `proconio::input!`。
+    //
+    // https://docs.rs/proconio/0.3.6/proconio/macro.input.html
+    input! {
+        a: f64,
+        b: f64,
+        h: f64,
+        m: f64,
+    }
+
+    // 座標として`num_complex::Complex<f64>`を使う。
+    // `Complex::from_polar`でxとθから(x・cosθ, x・sinθ)を得ることができ、また`Complex::norm`で2点間の距離を出すことができる。
+    //
+    // https://docs.rs/num-complex/0.2.4/num_complex/struct.Complex.html
+    // https://docs.rs/num-complex/0.2.4/num_complex/struct.Complex.html#method.from_polar
+    // https://docs.rs/num-complex/0.2.4/num_complex/struct.Complex.html#method.norm
+
+    let p1 = Complex::from_polar(&a, &(h * PI / 6.0 + m * PI / 360.0));
+    let p2 = Complex::from_polar(&b, &(m * PI / 30.0));
+    let ans = (p1 - p2).norm();
+    println!("{}", ans);
+}
diff --git a/test-examples.toml b/test-examples.toml
@@ -261,6 +261,13 @@ url = "https://atcoder.jp/contests/abc168/tasks/abc168_b"
 matching = "Words"
 meta = { using = ["ascii", "proconio"] }
 
+[examples.abc168-c]
+type = "Normal"
+name = "ABC168 - C - : (Colon)"
+url = "https://atcoder.jp/contests/abc168/tasks/abc168_c"
+matching = { FloatOr = { abs = 1e-9, rel = 1e-9 } }
+meta = { using = ["num", "proconio"] }
+
 [examples.agc020-c]
 type = "Normal"
 name = "AGC020: C - Median Sum"
