From 8833b7a5b246cad02e253838c07ba1689834e523 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Thu, 9 Dec 2021 13:32:48 +0000
Subject: Initial checkin

---
 3.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 3.c

(limited to '3.c')

diff --git a/3.c b/3.c
new file mode 100644
index 0000000..39db01d
--- /dev/null
+++ b/3.c
@@ -0,0 +1,75 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+static int FromBin(const char *p)
+{
+    int b = strlen(p) - 1;
+    int v = 0;
+    int f;
+
+    for(f = 0; p[f]; f++, b--)
+    {
+        if (p[f] == '1')
+        {
+            v |= 1 << b;
+        }
+    }
+
+    return v;
+}
+
+int main(void)
+{
+    char buff[80];
+    int bit[12] = {0};
+    int count = 0;
+    char str[13] = {0};
+    int f;
+    int gamma, epsilon;
+
+    while(fgets(buff, sizeof buff, stdin))
+    {
+        for(f = 0; f < 12; f++)
+        {
+            if (buff[f] == '1')
+            {
+                bit[f]++;
+            }
+        }
+
+        count++;
+    }
+
+    for(f = 0; f < 12; f++)
+    {
+        if (bit[f] > count / 2)
+        {
+            str[f] = '1';
+        }
+        else
+        {
+            str[f] = '0';
+        }
+    }
+
+    gamma = FromBin(str);
+
+    for(f = 0; f < 12; f++)
+    {
+        if (str[f] == '0')
+        {
+            str[f] = '1';
+        }
+        else
+        {
+            str[f] = '0';
+        }
+    }
+
+    epsilon = FromBin(str);
+
+    printf("%d\n", gamma * epsilon);
+
+    return 0;
+}
-- 
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