56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#include <iostream>
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#include <sstream>
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#include <vector>
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#include <unordered_map>
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#include <algorithm>
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using std::cout, std::endl;
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constexpr const char content[] = {
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#embed "input.txt"
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};
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void part_1() {
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std::vector<int> left_vec, right_vec;
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std::istringstream iss{content};
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int l_id, r_id;
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while (iss >> l_id >> r_id) {
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left_vec.emplace_back(l_id);
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right_vec.emplace_back(r_id);
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}
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std::sort(left_vec.begin(), left_vec.end());
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std::sort(right_vec.begin(), right_vec.end());
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auto diff_acc{0};
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for (auto i{0}; i < left_vec.size(); i++) {
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diff_acc += std::abs(left_vec[i] - right_vec[i]);
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}
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cout << diff_acc << endl;
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}
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void part_2() {
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std::vector<int> left_vec;
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std::unordered_map<int, int> right_map;
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std::istringstream iss{content};
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int l_id, r_id;
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while (iss >> l_id >> r_id) {
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left_vec.emplace_back(l_id);
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right_map[r_id]++;
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}
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auto sim_acc{0};
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for (auto left_num : left_vec) {
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sim_acc += right_map[left_num] * left_num;
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}
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cout << sim_acc << endl;
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}
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int main() {
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part_1();
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part_2();
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return 0;
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}
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