Method put

706-design-hashmap.rs:20–22

value will always be non-negative. */

(&mut self, key: i32, value: i32)

    /** value will always be non-negative. */
    fn put(&mut self, key: i32, value: i32) {
        self.map.insert(key, value);
    }

    /** Returns the value to which the specified key is mapped, or -1 if this map contains no mapping for the key */
    fn get(&self, key: i32) -> i32 {