commit a0f6b8594ffb645f61abf3f84353ed59c5bc489d
Author: npc-strider <npc.strider@gmail.com>
Date:   Thu Dec 3 14:39:42 2020 +0800

    first three days of advent of code :)

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..28ed612
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+data.txt
+input
diff --git a/1/a.py b/1/a.py
new file mode 100644
index 0000000..a77eec7
--- /dev/null
+++ b/1/a.py
@@ -0,0 +1,6 @@
+lines = open("data.txt").read().splitlines()
+
+for u in lines:
+    for v in lines:
+        if int(u)+int(v) == 2020:
+            print(int(u)*int(v))
\ No newline at end of file
diff --git a/1/b.py b/1/b.py
new file mode 100644
index 0000000..e3509cc
--- /dev/null
+++ b/1/b.py
@@ -0,0 +1,9 @@
+lines = open("data.txt").read().splitlines()
+
+numbers = []
+
+for u in lines:
+    for v in lines:
+        for w in lines:
+            if int(u)+int(v)+int(w) == 2020:
+                print(int(u)*int(v)*int(w))
\ No newline at end of file
diff --git a/2/a.py b/2/a.py
new file mode 100644
index 0000000..31b8091
--- /dev/null
+++ b/2/a.py
@@ -0,0 +1,11 @@
+lines = open("input").read().splitlines()
+
+count = 0
+for line in lines:
+    line = line.replace('-',' ').replace(':','').split(' ')
+    # print(line)
+    # print(line[3].count(line[2]))
+    if int(line[0]) <= line[3].count(line[2]) <= int(line[1]):
+        count = count + 1
+
+print(count)
\ No newline at end of file
diff --git a/2/b.py b/2/b.py
new file mode 100644
index 0000000..f3bb85c
--- /dev/null
+++ b/2/b.py
@@ -0,0 +1,18 @@
+lines = open("input").read().splitlines()
+
+count = 0
+for line in lines:
+    line = line.replace('-',' ').replace(':','').split(' ')
+    strarr = list(line[3])
+    # print(strarr)
+    v = 0
+    if strarr[int(line[0])-1] == line[2]:
+        v = v + 1
+    if strarr[int(line[1])-1] == line[2]:
+        v = v + 1
+    if v == 1:
+        count = count + 1
+    # print(line)
+    # print(line[3].count(line[2]))
+
+print(count)
\ No newline at end of file
diff --git a/3/a.py b/3/a.py
new file mode 100644
index 0000000..34eb903
--- /dev/null
+++ b/3/a.py
@@ -0,0 +1,19 @@
+
+lines = open('input').read().splitlines()
+period = 31 #in chars
+
+mat = []
+for line in lines:
+    mat_row = [1 if x == '#' else 0 for x in list(line)]
+    mat.append(mat_row)
+
+count = 0
+j_ = 0
+for i in range(0, len(mat)):
+    print(mat[i])
+    j = j_ % period
+    j_ += 3
+    
+    if (mat[i][j] == 1):
+        count += 1
+print(count)
\ No newline at end of file
diff --git a/3/b.py b/3/b.py
new file mode 100644
index 0000000..db5ac30
--- /dev/null
+++ b/3/b.py
@@ -0,0 +1,38 @@
+
+lines = open('input').read().splitlines()
+period = 31 #in chars
+
+mat = []
+for line in lines:
+    mat_row = [1 if x == '#' else 0 for x in list(line)]
+    mat.append(mat_row)
+
+
+ld = [
+    [1,1],
+    [3,1],
+    [5,1],
+    [7,1],
+    [1,2]
+]
+
+lcount = []
+for d in ld:
+    dx = d[0]
+    dy = d[1]
+    j_ = 0
+    count = 0
+    for i in range(0, len(mat), dy):
+        j = j_ % period
+        j_ += dx
+        
+        if (mat[i][j] == 1):
+            count += 1
+    lcount.append(count)
+
+print(lcount)
+ans = 1
+for r in lcount:
+    ans = r*ans
+
+print(ans)
\ No newline at end of file