AC043 in rust, finished all. (D doesn't get tested correctly locally)

atcoder/beginner_contests/abc043/src/bin/a.rs

@@ -0,0 +1,11 @@
+use proconio::input;
+
+fn main() {
+    input!{
+        n: u32,
+    };
+
+    let result = n * (n + 1) / 2;
+
+    println!("{}", {result});
+}

atcoder/beginner_contests/abc043/src/bin/b.rs

@@ -0,0 +1,21 @@
+use proconio::input;
+
+fn main() {
+    input!{
+        s: String,
+    };
+
+    let mut result = String::new();
+
+    for c in s.chars() {
+        if c == '0' {
+            result.push('0');
+        } else if c == '1' {
+            result.push('1');
+        } else {
+            result.pop();
+        }
+    }
+
+    println!("{}", {result});
+}

atcoder/beginner_contests/abc043/src/bin/c.rs

@@ -0,0 +1,28 @@
+use proconio::input;
+
+fn cost(target: i32, numbers: &[i32]) -> i32 {
+    let mut result = 0;
+
+    for n in numbers {
+        result += (target - n) * (target - n)
+    }
+
+    result
+}
+
+fn main() {
+    input!{
+        n: i32,
+        a: [i32; n],
+    };
+
+    let mut min = std::i32::MAX;
+    for t in -100..=100 {
+        let r = cost(t, &a);
+        if r < min {
+            min = r;
+        }
+    }
+
+    println!("{}", {min});
+}

atcoder/beginner_contests/abc043/src/bin/d.rs

@@ -0,0 +1,44 @@
+use proconio::input;
+
+fn main() {
+    input!{
+        s: String,
+    };
+
+    let mut cs = s.chars();
+    let l = s.len();
+
+    if l == 2 {
+        let a = cs.next().unwrap();
+        let b = cs.next().unwrap();
+
+        if a == b {
+            println!("1 2");
+        } else{    
+            println!("-1 -1");
+        }
+
+        return
+    }
+
+    let mut past_chars = [' '; 3];
+    past_chars[1] = cs.next().unwrap();
+    past_chars[2] = cs.next().unwrap();
+
+    for i in 2..l {
+        past_chars[0] = past_chars[1];
+        past_chars[1] = past_chars[2];
+        past_chars[2] = cs.next().unwrap();
+
+        let mut sorting = [' '; 3];
+        sorting.copy_from_slice(&past_chars);
+        sorting.sort();
+
+        if sorting[0] == sorting[1] || sorting[1] == sorting[2] {
+            println!("{} {}", {i-1}, {i+1});
+            return;
+        }
+    }
+
+    println!("-1 -1");
+}