58 lines
1.1 KiB
C++
58 lines
1.1 KiB
C++
#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <vector>
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int main()
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{
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std::ifstream file ("./1i.txt");
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std::vector<int> input;
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std::string line;
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while(std::getline(file, line))
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{
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input.push_back(std::stoi(line));
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}
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int found = 0;
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for (auto& i : input)
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{
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for (auto j : input)
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{
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if (i + j == 2020)
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{
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found = i * j;
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break;
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}
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}
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if (found != 0)
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break;
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}
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std::cout << "Part 1, 2 entries that sum to 2020: " << found << std::endl;
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found = 0;
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for (auto& i : input)
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{
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for (auto j : input)
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{
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for (auto k : input)
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{
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if (i + j + k == 2020)
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{
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found = i * j * k;
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break;
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}
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}
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if (found != 0)
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break;
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}
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if (found != 0)
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break;
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}
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std::cout << "Part 2, 3 entries that sum to 2020: " << found << std::endl;
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}
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