Solution

assignments/crypto_mining/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "crypto_mining"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+rand = "0.8.5"

assignments/crypto_mining/src/main.rs

@@ -0,0 +1,93 @@
+use std::io;
+use rand::Rng;
+use rand::distributions::WeightedIndex;
+use rand::distributions::Distribution;
+use std::collections::HashMap;
+
+const BILLION: u64 = 1_000_000_000;
+
+struct Result {
+    size: u8,
+    min: u64,
+    max: u64,
+    avg: f64,
+}
+
+fn main() {
+    for size in 1..100 { // fiecare lungime
+        println!("Size: {}", size);
+        let mut iter_result = Result {
+            size: size,
+            min: 0,
+            max: 0,
+            avg: 0.0,
+        };
+
+        for _ in 0..100 { // fiecare iteratie
+            let n: usize = size.into();
+            let mut rng = rand::thread_rng();
+
+            let mut array:Vec<u64> = vec![0; n];
+            // let mut weights:Vec<u64> = vec![0; (BILLION / 100) as usize];
+            // let mut weights:Vec<u64, u8> = vec![(0, 0); 1];
+            let mut weight_map = HashMap::new();
+
+            for i in 0..n {
+                array[i] = rng.gen_range(0..BILLION);
+                if weight_map.contains_key(&(array[i] / 100)) {
+                    *weight_map.get_mut(&(array[i] / 100)).unwrap() += 1;
+                } else {
+                    weight_map.insert(array[i] / 100, 1);
+                }
+            }
+
+            let mut keys:Vec<u64> = weight_map.clone().into_keys().collect();
+            let mut weights:Vec<u64> = weight_map.into_values().collect();
+
+            // println!("{:?} \n {:?}", keys, weights);
+
+
+            // println!("Weights: {dist:?}");
+            // println!("Array: {array:?}");
+
+            let mut counter = 0;
+
+            loop {
+                let mut dist = WeightedIndex::new(&weights).unwrap();
+                counter += 1;
+                let random_index = dist.sample(&mut rng);
+                // println!("{random_index}");
+                let mut num: u64 = (keys[random_index] * 100 + rng.gen_range(0..100)).try_into().unwrap();
+
+                // small hack -> weighted gen pt num / 100 + random gen 0-100
+
+                if array.contains(&num) {
+                    let index = array.iter().position(|&x| x == num).unwrap();
+                    array.remove(index);
+                    // println!("Removed: {num} on iter {counter}, array is now {array:?}");
+                    if array.is_empty() {
+                        break;
+                    }
+                    weights[random_index] -= 1;
+                    if weights[random_index] == 0 {
+                        weights.remove(random_index);
+                        keys.remove(random_index);
+                    }
+                }
+            }
+
+            if counter < iter_result.min || iter_result.min == 0 {
+                iter_result.min = counter;
+            }
+
+            if counter > iter_result.max {
+                iter_result.max = counter;
+            }
+
+            iter_result.avg += counter as f64;
+
+            // break;
+        }
+        println!("Min: {}, Max: {}, Avg: {}", iter_result.min, iter_result.max, iter_result.avg / 100.0);
+    }
+}

assignments/crypto_mining/target/.rustc_info.json

@@ -0,0 +1 @@
+{"rustc_fingerprint":17643547840083297108,"outputs":{"4614504638168534921":{"success":true,"status":"","code":0,"stdout":"rustc 1.84.1 (e71f9a9a9 2025-01-27)\nbinary: rustc\ncommit-hash: e71f9a9a98b0faf423844bf0ba7438f29dc27d58\ncommit-date: 2025-01-27\nhost: x86_64-unknown-linux-gnu\nrelease: 1.84.1\nLLVM version: 19.1.5\n","stderr":""},"15729799797837862367":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/root/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""}},"successes":{}}

assignments/crypto_mining/target/CACHEDIR.TAG

@@ -0,0 +1,3 @@
+Signature: 8a477f597d28d172789f06886806bc55
+# This file is a cache directory tag created by cargo.
+# For information about cache directory tags see https://bford.info/cachedir/

assignments/crypto_mining/target/debug/.fingerprint/byteorder-3f9b0df696b109da/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

assignments/crypto_mining/target/debug/.fingerprint/byteorder-3f9b0df696b109da/lib-byteorder

@@ -0,0 +1 @@
+12714492b9401594

assignments/crypto_mining/target/debug/.fingerprint/byteorder-3f9b0df696b109da/lib-byteorder.json

@@ -0,0 +1 @@
+{"rustc":13207435774680941178,"features":"[]","declared_features":"[\"default\", \"i128\", \"std\"]","target":16903832911151110546,"profile":12206360443249279867,"path":2917980152381096082,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/byteorder-3f9b0df696b109da/dep-lib-byteorder","checksum":false}}],"rustflags":[],"metadata":5398730104718078656,"config":2202906307356721367,"compile_kind":0}

assignments/crypto_mining/target/debug/.fingerprint/cfg-if-bbb8a7c192072622/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.

assignments/crypto_mining/target/debug/.fingerprint/cfg-if-bbb8a7c192072622/lib-cfg_if

@@ -0,0 +1 @@
+2590cf500e66af32

assignments/crypto_mining/target/debug/.fingerprint/cfg-if-bbb8a7c192072622/lib-cfg_if.json

@@ -0,0 +1 @@
+{"rustc":13207435774680941178,"features":"[]","declared_features":"[\"compiler_builtins\", \"core\", \"rustc-dep-of-std\"]","target":11601024444410784892,"profile":12206360443249279867,"path":1175956265451947015,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/cfg-if-bbb8a7c192072622/dep-lib-cfg_if","checksum":false}}],"rustflags":[],"metadata":8462187951337715540,"config":2202906307356721367,"compile_kind":0}

assignments/crypto_mining/target/debug/.fingerprint/crypto_mining-5688bd1f2e93559c/bin-crypto_mining.json

@@ -0,0 +1 @@
+{"rustc":13207435774680941178,"features":"[]","declared_features":"[]","target":8268801525592157822,"profile":11597332650809196192,"path":10602529704205407992,"deps":[],"local":[{"CheckDepInfo":{"dep_info":"debug/.fingerprint/crypto_mining-5688bd1f2e93559c/dep-bin-crypto_mining","checksum":false}}],"rustflags":[],"metadata":7797948686568424061,"config":2202906307356721367,"compile_kind":0}

assignments/crypto_mining/target/debug/.fingerprint/crypto_mining-5688bd1f2e93559c/invoked.timestamp

@@ -0,0 +1 @@
+This file has an mtime of when this was started.