84 lines
2.3 KiB
C++
84 lines
2.3 KiB
C++
#include <algorithm>
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#include <cstdint>
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#include <fstream>
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#include <iostream>
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#include <string>
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#include <vector>
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int main() {
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std::fstream input("input");
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std::string currentLine = "", lineOfOperations = "";
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std::vector<std::string> lines{};
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std::vector<uint64_t> results{};
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std::vector<uint64_t> startPositionOfOperations{};
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while (std::getline(input, currentLine, '\n')) {
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lines.push_back(currentLine);
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}
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// Just removing the operations for a for loop below
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lineOfOperations = lines.back();
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lines.pop_back();
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// Since only 3 possibilities are '+', '*', and ' '
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uint64_t count = 0;
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for (char character : lineOfOperations) {
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if (character != ' ') {
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startPositionOfOperations.push_back(count);
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}
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count++;
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}
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// Now we have each coloums length :^)
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count = 0;
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uint64_t total = 0;
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for (uint64_t PositionOfAnOperation : startPositionOfOperations) {
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std::vector<std::string> currentOperationLines{};
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bool isAddition = lineOfOperations[PositionOfAnOperation] == '+';
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uint64_t thisOperationsResult = 0, number = 0,
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NextPositionOfAnOperation = startPositionOfOperations[std::min(
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++count, startPositionOfOperations.size())];
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// Storing these will ease our work
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for (std::string line : lines) {
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currentOperationLines.push_back(
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line.substr(PositionOfAnOperation,
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NextPositionOfAnOperation - PositionOfAnOperation));
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}
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// Building the numbers like this was the easiest way, however I don't think
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// its efficient by any means
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for (uint16_t index = 0; index < currentOperationLines.begin()->length();
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index++) {
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std::string builtNumber = "";
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for (std::string subLine : currentOperationLines) {
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if (subLine[index] == ' ') {
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continue;
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}
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builtNumber.push_back(subLine[index]);
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}
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// Empty line, ignore
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if (builtNumber.empty()) {
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continue;
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}
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if (isAddition) {
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thisOperationsResult += std::stoull(builtNumber);
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continue;
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}
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if (thisOperationsResult != 0) {
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thisOperationsResult *= std::stoull(builtNumber);
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continue;
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}
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thisOperationsResult = std::stoull(builtNumber);
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}
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total += thisOperationsResult;
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}
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std::cout << total << std::endl;
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return 0;
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}
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