2125. 银行中的激光束数量

src/main.rs

@@ -2,32 +2,25 @@ mod arr;
 struct Solution {}
 
 impl Solution {
-    pub fn get_sneaky_numbers(nums: Vec<i32>) -> Vec<i32> {
-        let n = nums.len() - 2;
-        let xor_all: i32 = nums.iter().enumerate().fold((n ^ (n+1)) as i32, |acc, (i ,&x)| acc ^ x ^ i as i32);
-        let mut idx = 0;
-        let mut calc_idx = xor_all;
-        while true {
-            if calc_idx % 2 == 1 {
-                break;
+    pub fn number_of_beams(bank: Vec<String>) -> i32 {
+        let mut ans = 0;
+        let mut last_ones = 0;
+        for i in 0..bank.len() {
+            let new_ones = bank[i].chars().fold(0,|last, c| last + if c == '1'{1}else {0});
+            if new_ones == 0 {
+                continue;
             }
-            calc_idx >>= 1;
-            idx += 1;
-        }
-        let mut ans = vec![0;2];
-        for (i,&x) in nums.iter().enumerate() {
-            if i < n{
-                ans[i >> idx &1 as usize] ^= i as i32;
-            }
-            ans[(x >> idx &1) as usize] ^= x;
+            ans += last_ones * new_ones;
+            last_ones = new_ones;
         }
         ans
     }
 }
 
 fn main() {
-    println!(
-        "{:?}",
-        Solution::get_sneaky_numbers(vec![2,0,2,1,0])
-    );
+    let src = vec!["011001", "000000", "010100", "001000"]
+        .iter()
+        .map(|s| s.to_string())
+        .collect();
+    println!("{:?}", Solution::number_of_beams(src));
 }