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51 lines
1.0 KiB
C++
51 lines
1.0 KiB
C++
#include <cstdio>
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#include <iostream>
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#include <set>
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#include <string>
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constexpr long Y = 2000000;
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int main()
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{
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std::set<int> xs;
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std::set<int> bs;
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long px, py, bx, by;
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do {
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std::string line;
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std::getline(std::cin, line);
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if (std::cin.eof())
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break;
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auto a = sscanf(line.c_str(),
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"Sensor at x=%ld, y=%ld: closest beacon is at x=%ld, y=%ld",
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&px, &py, &bx, &by);
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std::cout << px << ' ' << py << ' ' << bx << ' ' << by;
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if (by == Y)
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bs.insert(bx);
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long ic = std::abs(px - bx) + std::abs(py - by);
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if (Y < py - ic || Y > py + ic)
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continue;
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long spr = (ic - std::abs(py - Y));
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for (long j = 0; j <= spr; ++j) {
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xs.insert(px + j);
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xs.insert(px - j);
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}
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std::cout << " -> " << xs.size() << std::endl;
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} while (1);
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for (auto& b : bs)
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xs.erase(b);
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std::cout << "Part 1: " << xs.size() << std::endl;
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return 0;
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}
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