Upsert 2341-maximum-number-of-pairs-in-array.rs

Author: memorycancel

2341-maximum-number-of-pairs-in-array.rs

@@ -0,0 +1,19 @@
+pub fn number_of_pairs(nums: Vec<i32>) -> Vec<i32> {
+    use std::collections::HashMap;
+    let mut mmp = HashMap::new();
+    let nums_len = nums.len();
+    for n in nums {
+        mmp.entry(n).and_modify(|e|*e += 1).or_insert(1);
+    }
+    let mut a = 0;
+    for (_, v) in mmp {
+        a += v % 2;
+    }
+    vec!((nums_len as i32 - a) / 2, a)
+}
+
+fn main() {
+    println!("{:?}", number_of_pairs(vec![1,3,2,1,3,2,2]));
+    println!("{:?}", number_of_pairs(vec![1,1]));
+    println!("{:?}", number_of_pairs(vec![0]));
+}