10

Author: gogsbread

cpp/10.cpp

@@ -0,0 +1,55 @@
+#include "common.h"
+
+namespace {
+long p1(const auto &input) {
+  long out{0};
+  for (auto [i, ins, inscycle, val, cy, reg] =
+           std::tuple<size_t, std::string, int, long, long, long>{
+               {0}, {}, {}, {}, {}, {1}};
+       i < input.size(); ++i, reg += val) {
+    std::istringstream ss{input[i]};
+    ss >> ins >> val;
+    inscycle = (ins == "addx" ? 2 : 1);
+    val = (ins == "noop" ? 0 : val);
+    while (inscycle--) {
+      ++cy;
+      if (cy <= 220 && (((cy - 20) % 40) == 0)) {
+        out += (cy * reg);
+      }
+    }
+  }
+  return out;
+}
+
+void p2(const auto &input) {
+  std::array<char, 40 * 6> crt{};
+  for (auto [i, ins, inscycle, val, cy, px, reg] =
+           std::tuple<size_t, std::string, int, long, long, long, long>{
+               {0}, {}, {}, {}, {}, {}, {1}};
+       i < input.size(); ++i, reg += val) {
+    std::istringstream ss{input[i]};
+    ss >> ins >> val;
+    inscycle = (ins == "addx" ? 2 : 1);
+    val = (ins == "noop" ? 0 : val);
+    while (inscycle--) {
+      ++cy;
+      px = cy - 1;
+      crt[px] = ((reg - 1 <= (px % 40)) && (reg + 1 >= (px % 40))) ? '#' : '.';
+    }
+  }
+
+  for (size_t i = 0, j = 0; i < 40 * 6; ++i) {
+    if ((i != 0) && (i % 40 == 0)) {
+      ++j;
+      std::cout << std::endl;
+    }
+    std::cout << crt[(j * 40) + (i % 40)];
+  }
+}
+} // namespace
+
+int main() {
+  const auto &input = gb::advent2021::readIn();
+  gb::advent2021::writeOut(std::to_string(p1(input)));
+  p2(input);
+}

cpp/meson.build

@@ -38,9 +38,9 @@ executable('9',
     '9.cpp',
     dependencies: [])
 
-# executable('10',
-#     '10.cpp',
-#     dependencies: [])
+executable('10',
+    '10.cpp',
+    dependencies: [])
 
 # executable('11',
 #     '11.cpp',