Completed day 10

2020/day10.cpp

@@ -0,0 +1,76 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2020 Gnarwhal
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files(the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+
+#include <vector>
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include "types.hpp"
+
+struct Pair {
+	u64 jolt;
+	u64 count;
+};
+
+auto operator<(const Pair & left, const Pair & right) -> bool {
+	return left.jolt < right.jolt;
+}
+
+auto main(i32 argc, char * argv[]) -> i32 {
+	auto jolts = std::vector<Pair>{{ 0, 1 }};
+	{
+		auto line = std::string();
+		auto file = std::ifstream("day10.input");
+		while (getline(file, line)) {
+			jolts.push_back({ (u64) std::stoll(line), 0 });
+		}
+	}
+	std::sort(jolts.begin(), jolts.end());
+	jolts.push_back({ jolts[jolts.size() - 1].jolt + 3, 0 });
+
+	auto dif1 = usize(0);
+	auto dif3 = usize(0);
+	for (auto i = usize(0); i < jolts.size() - 1; ++i) {
+		     if (jolts[i + 1].jolt - jolts[i].jolt == 1) ++dif1;
+		else if (jolts[i + 1].jolt - jolts[i].jolt == 3) ++dif3;
+	}
+
+	std::cout << (dif1 * dif3) << std::endl;
+
+	for (auto i = i32(0); i < jolts.size() - 1; ++i) {
+		for (auto j = i + 1; j < jolts.size(); ++j) {
+			if (jolts[j].jolt <= jolts[i].jolt + 3) {
+				jolts[j].count += jolts[i].count;
+			} else {
+				break;
+			}
+		}
+	}
+	std::cout << jolts[jolts.size() - 1].count << std::endl;
+
+	return 0;
+}

2020/day10.input

@@ -0,0 +1,96 @@
+133
+157
+39
+74
+108
+136
+92
+55
+86
+46
+111
+58
+80
+115
+84
+67
+98
+30
+40
+61
+71
+114
+17
+9
+123
+142
+49
+158
+107
+139
+104
+132
+155
+96
+91
+15
+11
+23
+54
+6
+63
+126
+3
+10
+116
+87
+68
+72
+109
+62
+134
+103
+1
+16
+101
+117
+35
+120
+151
+102
+85
+145
+135
+79
+2
+147
+33
+41
+93
+52
+48
+64
+81
+29
+20
+110
+129
+43
+148
+36
+53
+26
+42
+156
+154
+77
+88
+73
+27
+34
+12
+146
+78
+47
+28
+97

2020/day9.cpp

@@ -0,0 +1,88 @@
+/*******************************************************************************
+ *
+ * Copyright (c) 2020 Gnarwhal
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files(the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ *******************************************************************************/
+
+#include <vector>
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include "types.hpp"
+
+auto find_sum(usize index, std::vector<u64> xmas) {
+	for (auto i = index - 25; i < index - 1; ++i) {
+		for (auto j = i + 1; j < index; ++j) {
+			if (xmas[i] + xmas[j] == xmas[index]) {
+				return true;
+			}
+		}
+	}
+	return false;
+}
+
+auto main(i32 argc, char * argv[]) -> i32 {
+	auto xmas = std::vector<u64>();
+	auto line = std::string();
+	auto file = std::ifstream("day9.input");
+	while (getline(file, line)) {
+		xmas.push_back(std::stoll(line));
+	}
+
+	auto invalid = u64(0);
+	for (auto i = usize(25); i < xmas.size(); ++i) {
+		if (!find_sum(i, xmas)) {
+			std::cout << (invalid = xmas[i]) << std::endl;
+			break;
+		}
+	}
+	
+	auto head_index = 0;
+	auto tail_index = 1;
+	auto sum        = xmas[0] + xmas[1];
+	while (sum != invalid) {
+		if (sum < invalid) {
+			sum += xmas[++tail_index];
+		} else if (head_index + 1 < tail_index) {
+			sum -= xmas[head_index];
+			++head_index;
+		} else {
+			head_index = tail_index + 1;
+			tail_index = head_index + 1;
+			sum        = xmas[head_index] + xmas[tail_index];
+		}
+	}
+	auto min = xmas[tail_index];
+	auto max = xmas[tail_index];
+	for (auto i = head_index; i < tail_index; ++i) {
+		if (xmas[i] < min) {
+			min = xmas[i];
+		} else if (xmas[i] > max) {
+			max = xmas[i];
+		}
+	}
+	std::cout << (min + max) << std::endl;
+
+	return 0;
+}

2020/template.cpp

@@ -34,7 +34,7 @@
 auto main(i32 argc, char * argv[]) -> i32 {
 	{
 		auto line = std::string();
-		auto file = std::ifstream("day$NUM.input");
+		auto file = std::ifstream("dayNUM.input");
 		while (getline(file, line)) {
 			
 		}