From 0be9ecb987d9e4fd9dd8c97c456d770b5ca9b6b5 Mon Sep 17 00:00:00 2001
From: Misaka Mikoto <4C2BOA6SRQM4VM4I6RNIKOM6W@cybercat.cc>
Date: Sun, 6 Dec 2020 18:26:56 +0200
Subject: [PATCH] pain

---
 2020/6     | 2197 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2020/6-1.c |   42 +
 2020/6.c   |   27 +
 2020/6test |   15 +
 4 files changed, 2281 insertions(+)
 create mode 100644 2020/6
 create mode 100644 2020/6-1.c
 create mode 100644 2020/6.c
 create mode 100644 2020/6test

diff --git a/2020/6 b/2020/6
new file mode 100644
index 0000000..22f2281
--- /dev/null
+++ b/2020/6
@@ -0,0 +1,2197 @@
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diff --git a/2020/6-1.c b/2020/6-1.c
new file mode 100644
index 0000000..91c0a01
--- /dev/null
+++ b/2020/6-1.c
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <string.h>
+
+int
+main (void)
+{
+  freopen ("6", "r", stdin);
+  int out = 0;
+  int c = 0;
+  while (c != EOF) { /* group */
+    unsigned char x[26];
+    memset(x, 1, sizeof x);
+
+    while (c != EOF) { /* person */
+      unsigned char y[26] = {0};
+      int tmp;
+
+      do { /* character */
+	c = getchar ();
+	if (c == EOF || c == '\n')
+	  break;
+	y[c - 'a'] = 1;
+      } while (1);
+
+      for (int i = 0; i < sizeof y / sizeof y[0]; i++)
+	x[i] &= y[i];
+
+      tmp = getchar();
+      if (tmp == '\n')
+	break;
+      else if (tmp == EOF)
+	c = EOF;
+      else
+	ungetc(tmp, stdin);
+    }
+
+    for (int i = 0; i < sizeof x / sizeof x[0]; i++)
+      out += x[i];
+  }
+  printf ("%d\n", out);
+  return 0;
+}
diff --git a/2020/6.c b/2020/6.c
new file mode 100644
index 0000000..a583ee6
--- /dev/null
+++ b/2020/6.c
@@ -0,0 +1,27 @@
+#include <stdio.h>
+
+int
+main (void)
+{
+  freopen ("6", "r", stdin);
+  int out = 0;
+  int c = 0;
+  while (c != EOF) {
+    int y[26] = {0};
+    while (c != EOF) {
+      c = getchar ();
+      if (c == '\n')
+	{
+	  c = getchar ();
+	  if (c == '\n')
+	    break;
+	}
+      if (c != EOF) /* else intentionally not used */
+	y[c - 'a'] = 1;
+    }
+    for (int i = 0; i < sizeof y / sizeof y[0]; i++)
+      out += y[i];
+  }
+  printf ("%d\n", out);
+  return 0;
+}
diff --git a/2020/6test b/2020/6test
new file mode 100644
index 0000000..0f5b3bc
--- /dev/null
+++ b/2020/6test
@@ -0,0 +1,15 @@
+abc
+
+a
+b
+c
+
+ab
+ac
+
+a
+a
+a
+a
+
+b