complete 30160.rs 33913.rs

storage/zeta/rs/completed/30160.rs

@@ -0,0 +1,48 @@
+use std::io::stdin;
+
+fn main() {
+    let mut line = String::new();
+    stdin().read_line(&mut line).unwrap();
+    let n: usize = line.trim().parse().unwrap();
+
+    let arr = {
+        line.clear();
+        stdin().read_line(&mut line).unwrap();
+        line.split(' ')
+            .map(|x| x.trim().parse::<i64>().unwrap())
+            .collect::<Vec<i64>>()
+    };
+
+    /*
+       0
+       a1                   // ds = a1                   // dds = a1
+       4 * a1 + a2          // ds = 3 * a1 + a2          // dds = 2 * a1 + a2
+       9 * a1 + 4 * a2 + a3 // ds = 5 * a1 + 3 * a2 + a3 // dds = 2 * a1 + 2 * a2 + a3 // ds <- dds + ds
+    */
+
+    let mut ds = 0i64;
+    let mut dds = 0i64;
+
+    let mut sum = 0i64;
+    let square_weighted_arr = (0..n)
+        .map(|i| {
+            dds = if i != 0 {
+                dds + arr[i] + arr[i - 1]
+            } else {
+                arr[i]
+            };
+            ds = ds + dds;
+            sum += ds;
+            sum
+        })
+        .collect::<Vec<i64>>();
+
+    println!(
+        "{}",
+        square_weighted_arr
+            .iter()
+            .map(|x| x.to_string())
+            .collect::<Vec<String>>()
+            .join(" ")
+    );
+}

storage/zeta/rs/completed/33913.rs

@@ -0,0 +1,37 @@
+use std::io::stdin;
+
+const MOD: usize = 1_000_000_007;
+
+fn main() {
+    let mut line = String::new();
+    stdin().read_line(&mut line).unwrap();
+
+    let n = line.trim().parse::<usize>().unwrap();
+
+    /*
+        f[0] even =  1 // empty
+        f[0] odd  =  0
+        f[1] even = 24 // without SC
+        f[1] odd  =  2 // with SC
+
+        f[2] even = f[1] even * 24 + f[1] odd * 2
+        f[2] odd  = f[1] even * 2  + f[1] odd * 24 
+
+    */
+
+    let mut f0e = 1;
+    let mut f0i = 0;
+    let mut f1e = 24;
+    let mut f1i = 2;
+
+    for _ in 2..=n {
+        let f2e = (f1e * 24 + f1i * 2) % MOD;
+        let f2i = (f1e * 2 + f1i * 24) % MOD;
+        f0e = f1e;
+        f0i = f1i;
+        f1e = f2e;
+        f1i = f2i;
+    }
+
+    println!("{}", f1e);
+}