warm up

week1/part-2-warmup/src/main.rs

@@ -7,15 +7,38 @@ fn main() {
 }
 
 fn add_n(v: Vec<i32>, n: i32) -> Vec<i32> {
-    unimplemented!()
+    // The function should return a new vector whose elements are the numbers in the original vector v with n added to each number.
+    let mut newvec = Vec::new();
+    for i in v {
+        newvec.push(i + n);
+    }
+    newvec
 }
 
 fn add_n_inplace(v: &mut Vec<i32>, n: i32) {
-    unimplemented!()
+    // does the same thing as add_n, but modifies v directly (in place) and does not return anything.
+    for i in v {
+        *i += n;
+    }
 }
 
 fn dedup(v: &mut Vec<i32>) {
-    unimplemented!()
+    // that removes duplicate elements from a vector in-place (i.e. modifies v directly). 
+    // If an element is repeated anywhere in the vector, you should keep the element that appears first.
+    // You may want to use a HashSet for this.
+    let mut _hash = HashSet::new();
+    let mut _repeated = Vec::new();
+    for i in 0..v.len() {
+        if _hash.contains(&v[i]) {
+            _repeated.push(i);
+        } else {
+            _hash.insert(v[i]);
+        }
+    }
+    _repeated.reverse();
+    for i in _repeated {
+        v.remove(i);
+    }
 }
 
 #[cfg(test)]