44 lines
927 B
C++
44 lines
927 B
C++
#include <cassert>
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#include <iostream>
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#include <string>
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#include <vector>
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std::string rotate(std::string const& s, std::string::size_type amount)
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{
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auto length = s.length();
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return (s + s).substr(amount % length, length);
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}
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int main(int argc, char** argv)
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{
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if (argc != 3) {
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std::cerr << "Usage: " << argv[0] << " <right> <down>\n";
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return 1;
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}
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int right = atoi(argv[1]);
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int down = atoi(argv[2]);
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if (right <= 0) {
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std::cerr << "Right is less than 1\n";
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return 1;
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}
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if (down <= 0) {
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std::cerr << "Down is less than 1\n";
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return 1;
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}
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unsigned count = 0;
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int row = -1;
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std::string::size_type rotation = 0;
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for (std::string line; std::getline(std::cin, line);) {
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++row;
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if ((row % down) != 0) {
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continue;
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}
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auto rotated = rotate(line, rotation);
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rotation += right;
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count += (rotated[0] == '#');
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}
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std::cout << count << "\n";
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return 0;
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} |