Initial commit with solutions from 2024

2025-11-26 21:59:50 +01:00
commit be113565fb
72 changed files with 7030 additions and 0 deletions
@@ -0,0 +1,94 @@
+#include "common/aoc.h"
+
+namespace day07
+{
+  struct Data
+  {
+    int64_t result;
+    std::vector<int64_t> terms;
+  };
+
+  REGISTER_DAY(2024, Day07, std::vector<Data>, int64_t);
+
+  REGISTER_TEST_EXAMPLE(2024, Day07, ExampleInput, 1, 3749);
+  REGISTER_TEST(2024, Day07, Input, 1, 945512582195);
+  REGISTER_TEST_EXAMPLE(2024, Day07, ExampleInput, 2, 11387);
+  REGISTER_TEST(2024, Day07, Input, 2, 271691107779347);
+
+  READ_INPUT(input)
+  {
+    std::vector<Data> datas;
+    std::string str;
+    while (std::getline(input, str))
+    {
+      std::stringstream ss{str};
+      Data data;
+      ss >> data.result >> ": ";
+      while (std::getline(ss, str, ' '))
+      {
+        data.terms.emplace_back(std::stoll(str));
+      }
+      datas.emplace_back(data);
+    }
+    return datas;
+  }
+
+  bool CanCalculateResultP1(const Data& data, int index, int64_t current)
+  {
+    if (index >= data.terms.size())
+      return data.result == current;
+    if (index == 0)
+      return CanCalculateResultP1(data, index + 1, data.terms[index]);
+
+    if (CanCalculateResultP1(data, index + 1, current + data.terms[index]))
+      return true;
+    else if (CanCalculateResultP1(data, index + 1, current * data.terms[index]))
+      return true;
+    return false;
+  }
+
+  int64_t Concat(int64_t i1, int64_t i2)
+  {
+    int64_t base = 10;
+    while (i2 >= base) base *= 10;
+    return i1 * base + i2;
+  }
+
+  bool CanCalculateResultP2(const Data& data, int index, int64_t current)
+  {
+    if (index >= data.terms.size())
+      return data.result == current;
+    if (index == 0)
+      return CanCalculateResultP2(data, index + 1, data.terms[index]);
+
+    if (CanCalculateResultP2(data, index + 1, current + data.terms[index]))
+      return true;
+    else if (CanCalculateResultP2(data, index + 1, current * data.terms[index]))
+      return true;
+    else if (CanCalculateResultP2(data, index + 1, Concat(current, data.terms[index])))
+      return true;
+    return false;
+  }
+
+  OUTPUT1(input)
+  {
+    int64_t sum = 0;
+    for (const auto& data : input)
+    {
+      if (CanCalculateResultP1(data, 0, 0))
+        sum += data.result;
+    }
+    return sum;
+  }
+
+  OUTPUT2(input)
+  {
+    int64_t sum = 0;
+    for (const auto& data : input)
+    {
+      if (CanCalculateResultP2(data, 0, 0))
+        sum += data.result;
+    }
+    return sum;
+  }
+}