2016 day6 part1

3 files changed, 53 insertions, 0 deletions

diff --git a/src/2016/day6/aoc.cpp b/src/2016/day6/aoc.cpp
index 55f4247..521ca55 100644
--- a/src/2016/day6/aoc.cpp
+++ b/src/2016/day6/aoc.cpp
@@ -2,4 +2,40 @@
 
 namespace aoc2016 {
 
+struct counter {
+  int az[26] = {0};
+
+  void add(char c) { az[c - 'a'] += 1; }
+  char most() {
+    int max{INT32_MIN};
+    int index{0};
+    for (int i = 0; i < 26; i++) {
+      if (az[i] > max) {
+        max = az[i];
+        index = i;
+      }
+    }
+    return 'a' + index;
+  }
+};
+
+void day6(line_view file, char msg[]) {
+  counter cs[8];
+  per_line(file, [&cs](line_view lv) {
+    const char* p = lv.line;
+    int index{0};
+    while (p < lv.line + lv.length) {
+      if (*p >= 'a' && *p <= 'z') {
+        cs[index++].add(*p);
+      }
+      p++;
+    }
+    return true;
+  });
+
+  for (size_t i = 0; i < ARRAY_SIZE(cs); i++) {
+    msg[i] = cs[i].most();
+  }
 }
+
+} // namespace aoc2016
diff --git a/src/2016/day6/aoc.h b/src/2016/day6/aoc.h
index 95823fe..2ab2c4c 100644
--- a/src/2016/day6/aoc.h
+++ b/src/2016/day6/aoc.h
@@ -3,4 +3,5 @@
 
 namespace aoc2016 {
 
+void day6(line_view, char[]);
 }
diff --git a/src/2016/day6/input0 b/src/2016/day6/input0
new file mode 100644
index 0000000..32ba518
--- /dev/null
+++ b/src/2016/day6/input0
@@ -0,0 +1,16 @@
+eedadn
+drvtee
+eandsr
+raavrd
+atevrs
+tsrnev
+sdttsa
+rasrtv
+nssdts
+ntnada
+svetve
+tesnvt
+vntsnd
+vrdear
+dvrsen
+enarar