feat: add initial implementation of Cargo.toml, Cargo.lock, and lib.rs with num_identical_pairs function

1512_number_of_good_pairs/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "number_of_good_pairs"
+version = "0.1.0"

1512_number_of_good_pairs/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "number_of_good_pairs"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

1512_number_of_good_pairs/src/lib.rs

@@ -0,0 +1,17 @@
+pub struct Solution;
+
+impl Solution {
+    pub fn num_identical_pairs(nums: Vec<i32>) -> i32 {
+        let mut result = 0;
+
+        for i in 0..nums.len() {
+            for j in (i + 1)..nums.len() {
+                if nums[i] == nums[j] {
+                    result += 1;
+                }
+            }
+        }
+
+        result
+    }
+}