ABC 048, finished all with help of editorial

atcoder/beginner_contests/abc048/Cargo.lock

@@ -0,0 +1,25 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "abc048"
+version = "0.1.0"
+dependencies = [
+ "proconio",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "proconio"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91c333be3af2936f8e810300bc74fe4d0cc168ebc04ab02a28c5b1060fa1bd59"
+dependencies = [
+ "lazy_static",
+]

atcoder/beginner_contests/abc048/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "abc048"
+version = "0.1.0"
+edition = "2021"
+
+# dependencies added to new project
+[dependencies]
+proconio = "0.4.3"
+
+[profile.release]
+lto = true
+panic = 'abort'

atcoder/beginner_contests/abc048/src/bin/a.rs

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+use proconio::input;
+
+fn main(){
+    input!{
+        _atcoder: String,
+        s: String,
+        _contest: String,
+    };
+
+    println!("A{}C", s.chars().next().unwrap());
+}

atcoder/beginner_contests/abc048/src/bin/b.rs

@@ -0,0 +1,21 @@
+use proconio::input;
+
+fn f(n: i64, x: i64) -> i64 {
+    if n == -1 {
+        0
+    } else {
+        n / x + 1
+    }
+}
+
+fn main(){
+    input!{
+        a: i64,
+        b: i64,
+        x: i64,
+    };
+
+    let result = f(b, x) - f(a - 1, x);
+
+    println!("{}", result);
+}

atcoder/beginner_contests/abc048/src/bin/c.rs

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+use proconio::input;
+
+fn main(){
+    input!{
+        n: u64,
+        x: u64,
+        mut a: [u64; n],
+    };
+
+    let mut result = 0;
+    for i in 0..=((n-2) as usize) {
+        if a[i] + a[i+1] > x {
+            let dif = a[i] + a[i+1] - x;
+            if dif > a[i+1] {
+                a[i] -= dif - a[i+1];
+                a[i+1] = 0;
+            } else {
+                a[i+1] -= dif;
+            }
+            result += dif;
+        }
+    }
+
+    println!("{}", result);
+}

atcoder/beginner_contests/abc048/src/bin/d.rs

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+use proconio::input;
+
+fn main(){
+    input!{
+        s: String,
+    };
+
+    if (s.len() % 2 == 0) ^ (s.chars().next().unwrap() == s.chars().last().unwrap()) {
+        println!("Second");
+    } else {
+        println!("First");
+    }
+}