day02, advent of code 2022

1 files changed, 85 insertions, 0 deletions

diff --git a/2022/src/day02.cpp b/2022/src/day02.cpp
new file mode 100644
index 0000000..65146d5
--- /dev/null
+++ b/2022/src/day02.cpp
@@ -0,0 +1,85 @@
+#include <fstream>
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+using namespace std;
+
+vector<tuple<int, int>>
+read_file(string_view filename)
+{
+        fstream                 input{ filename };
+        vector<tuple<int, int>> data;
+
+        for ( string line; getline(input, line); ) {
+                data.emplace_back(line[0] - 'A' + 1, line[2] - 'X' + 1);
+        }
+
+        return data;
+}
+
+void
+part1(const vector<tuple<int, int>>& lines)
+{
+        map<int, int> wins{
+                { 1, 2 },
+                { 2, 3 },
+                { 3, 1 }
+        };
+
+        static const int INC_DRAW = 3;
+        static const int INC_WIN  = 6;
+
+        int score = 0;
+        for ( auto [a, b]: lines ) {
+                score += b;
+                if ( a == b ) {
+                        score += INC_DRAW;
+                }
+                else if ( wins[a] == b ) {
+                        score += INC_WIN;
+                }
+        }
+        cout << score << endl;
+}
+
+void
+part2(const vector<tuple<int, int>>& lines)
+{
+        map<int, int> wins{
+                { 1, 2 },
+                { 2, 3 },
+                { 3, 1 }
+        };
+
+        map<int, int> loose{
+                { 2, 1 },
+                { 3, 2 },
+                { 1, 3 }
+        };
+
+        static const int INC_DRAW = 3;
+        static const int INC_WIN  = 6;
+
+        int score = 0;
+        for ( auto [a, b]: lines ) {
+                if (b == 2) {
+                        score += a + INC_DRAW;
+                }
+                else if (b == 3) {
+                        score += wins[a] + INC_WIN;
+                }
+                else {
+                        score += loose[a];
+                }
+        }
+        cout << score << endl;
+}
+
+int
+main()
+{
+        auto lines = read_file("data/day02.txt");
+        part1(lines);
+        part2(lines);
+}