Files
advent-of-code/2020/puzzle-03-01.cc

24 lines
551 B
C++

#include <cassert>
#include <iostream>
#include <string>
#include <vector>
std::string rotate(std::string const& s, std::string::size_type amount)
{
auto length = s.length();
return (s + s).substr(amount % length, length);
}
int main(int argc, char** argv)
{
unsigned count = 0;
std::string::size_type rotation = 0;
for (std::string line; std::getline(std::cin, line);) {
auto rotated = rotate(line, rotation);
rotation += 3;
count += (rotated[0] == '#');
}
std::cout << "Number of trees: " << count << "\n";
return 0;
}