5 files changed, 238 insertions, 0 deletions
diff --git a/2020/day01/.gitignore b/2020/day01/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/2020/day01/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/2020/day01/Cargo.lock b/2020/day01/Cargo.lock
new file mode 100644
index 0000000..c3aedd7
--- /dev/null
+++ b/2020/day01/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "hello"
+version = "0.1.0"
diff --git a/2020/day01/Cargo.toml b/2020/day01/Cargo.toml
new file mode 100644
index 0000000..fb1ec2c
--- /dev/null
+++ b/2020/day01/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "hello"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2020/day01/input.txt b/2020/day01/input.txt
new file mode 100644
index 0000000..17580f0
--- /dev/null
+++ b/2020/day01/input.txt
@@ -0,0 +1,200 @@
+1287
+1366
+1669
+1724
+1338
+1560
+1328
+1886
+1514
+1863
+1876
+1732
+1544
+1547
+1622
+1891
+1453
+1936
+178
+1398
+1454
+1482
+1585
+1625
+1748
+1888
+1723
+717
+1301
+1840
+1930
+1314
+1458
+1952
+1520
+1994
+1924
+1873
+1283
+1036
+2005
+1987
+1973
+1926
+335
+1316
+1241
+1611
+1593
+1754
+1254
+1768
+1824
+1752
+1559
+1221
+1855
+1907
+1917
+1975
+1782
+1966
+1395
+1681
+1236
+1572
+437
+1294
+1614
+1549
+1769
+1963
+1953
+1708
+1382
+1920
+1884
+1841
+1055
+1799
+1818
+1902
+1541
+1830
+1817
+1939
+1311
+1157
+1997
+1269
+2000
+1573
+1898
+1467
+1929
+1530
+1336
+1599
+1860
+1455
+1944
+1339
+1341
+1874
+1322
+1340
+1583
+1765
+1776
+1304
+1880
+1237
+1770
+1011
+1634
+1343
+1864
+1648
+1588
+933
+1839
+1245
+780
+1671
+1989
+1416
+1268
+1619
+1399
+1638
+1319
+1565
+1318
+1084
+1397
+1645
+1760
+1487
+1892
+1980
+1928
+1808
+1692
+1159
+1531
+1575
+457
+1650
+1308
+1347
+1427
+1148
+1705
+1356
+1519
+1490
+1324
+1387
+1649
+1780
+1361
+1866
+1828
+1274
+1606
+1477
+1956
+734
+1483
+1513
+1215
+1927
+1988
+1686
+1914
+1424
+968
+1949
+1999
+1296
+1615
+1446
+1698
+1959
+1983
+2010
+1984
+1859
+1838
+1680
+1134
+1529
+1552
+1764
+1981
+1862
+1430
+1793
+1901
+1909
diff --git a/2020/day01/src/main.rs b/2020/day01/src/main.rs
new file mode 100644
index 0000000..02a3151
--- /dev/null
+++ b/2020/day01/src/main.rs
@@ -0,0 +1,22 @@
+use std::fs;
+use std::process;
+
+fn main() {
+    let raw = fs::read_to_string("input.txt").unwrap_or_else(|err| {
+        println!("Failed to open file. {}", err);
+        process::exit(1);
+    } );
+
+    let nums : Vec<i32> = raw.lines()
+        .map(|x| x.parse().unwrap())
+        .collect();
+  
+    let res : Vec<i32> = nums.iter()
+        .map(|&x| nums.iter().map(move |&y| (x, y)))
+        .flatten()
+        .filter(|(x, y)| x+y == 2020)
+        .map(|(x, y)| x*y)
+        .collect();
+
+    println!("x+y = 2020, x*y = {}", res.first().unwrap());
+}