62 lines
1.2 KiB
C++
62 lines
1.2 KiB
C++
#include <fstream>
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#include <iostream>
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#include <vector>
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struct Data{ char dir; int64_t cnt; };
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int64_t part_1(const std::vector<Data>&);
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int64_t part_2(const std::vector<Data>&);
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int main() {
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std::ifstream file{"input/2025-1.txt"};
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Data line;
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std::vector<Data> v;
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while (file >> line.dir >> line.cnt) {
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v.push_back(line);
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}
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std::cout << "Part 1: " << part_1(v) << std::endl;
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std::cout << "Part 1: " << part_2(v) << std::endl;
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}
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int64_t part_1(const std::vector<Data>& v) {
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int64_t loc{50}, presses{0};
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for (auto data : v) {
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if (data.dir == 'L') {
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loc -= data.cnt % 100;
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} else {
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loc += data.cnt % 100;
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}
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loc %= 100;
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if (loc < 0) {
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loc += 100;
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}
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if (loc == 0) {
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++presses;
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}
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}
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return presses;
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}
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int64_t part_2(const std::vector<Data>& v) {
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int64_t loc{50}, presses{0};
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for (auto data : v) {
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auto last_loc = loc;
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if (data.dir == 'L') {
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loc -= data.cnt % 100;
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} else {
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loc += data.cnt % 100;
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}
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presses += std::abs(data.cnt / 100);
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if ((loc != last_loc && loc >= 100) || (loc <= 0 && last_loc != 0)) {
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presses += 1;
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}
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loc %= 100;
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if (loc < 0) {
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loc += 100;
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}
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}
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return presses;
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}
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