Day02

README.md

@@ -9,4 +9,6 @@ Place a file called "session" with your session key cookie from https://adventof
 
 Expects runtime arguments as days, for example:
 
-"5 9 1" executes Days 5, 9, 1 in this order.
+"5 9 1" executes Days 5, 9, 1 in this order.
+
+Add argument "T" before to use XX_testInput.txt rather than XX_input.txt

src/days/02/Day02.cpp

@@ -1,9 +1,46 @@
 #include "Day02.h"
 
+int Day02::getScore(char opponent, char me) {
+    int outcome;
+    if (opponent == me)
+        outcome = 3;
+    else if (opponent == me + 1 || opponent == me - 2)
+        outcome = 0;
+    else
+        outcome = 6;
+    return outcome + me - 64;
+}
+
 Result Day02::Task1() {
-    return Day::Task1();
+    int score = 0;
+    for (string line : input){
+        char predict = line.at(0);
+        char answer = char(line.at(2) - 23);
+        score += getScore(predict, answer);
+    }
+    return to_string(score);
 }
 
 Result Day02::Task2() {
-    return Day::Task2();
+    int score = 0;
+    for (string line : input){
+        char predict = line.at(0);
+        char outcome = line.at(2);
+
+        char answer;
+        if (outcome == 'X'){
+            if (predict > 'A') answer = char(predict - 1);
+            else answer = 'C';
+        }
+        if (outcome == 'Y'){
+            answer = predict;
+        }
+        if (outcome == 'Z'){
+            if (predict < 'C') answer = char(predict + 1);
+            else answer = 'A';
+        }
+
+        score += getScore(predict, answer);
+    }
+    return to_string(score);
 }

src/days/02/Day02.h

@@ -7,4 +7,7 @@ protected:
     Result Task1() override;
 
     Result Task2() override;
+private:
+    // chars A, B, C
+    static int getScore(char, char);
 };

src/main.cpp

@@ -50,7 +50,12 @@ int main(int argc, char *argv[]) {
 	auto days = getAllDays();
 	std::filesystem::create_directory("input");
 
-	for (int i = 1; i < argc; i++) {
+    int i = 1;
+    if (argc > 1 && std::string(argv[1]) == "T") {
+        useTestInput = true;
+        i++;
+    }
+	for (; i < argc; i++) {
 		int dayNum = std::stoi(argv[i]);
 		std::cout << "Running day " << dayNum << std::endl;
 		Input input = getInput(dayNum, key, useTestInput);

src/util.h

@@ -7,4 +7,5 @@
 #include <iostream>
 
 using std::stoi, std::to_string;
-using std::cout, std::endl;
+using std::cout, std::endl;
+using std::string, std::vector;