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69 lines
1.5 KiB
C++
69 lines
1.5 KiB
C++
#include <cstdio>
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#include <iostream>
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#include <string>
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#include <vector>
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struct Sensor
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{
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long x, y, power;
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Sensor(long xx, long yy, long pp = 0):
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x(xx), y(yy), power(pp) {}
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};
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std::vector<Sensor> sensors;
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bool isDistressBeacon(const Sensor& c)
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{
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if (c.x < 0 || c.x > 4000000 || c.y < 0 || c.y > 4000000)
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return false;
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bool found = true;
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uint64_t freq = 0;
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for (auto& s : sensors) {
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auto dist = std::abs(c.x - s.x) + std::abs(c.y - s.y);
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if (dist <= s.power) {
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found = false;
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break;
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}
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}
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return found;
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}
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int main()
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{
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std::string line;
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std::getline(std::cin, line);
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for (; !std::cin.eof(); std::getline(std::cin, line)) {
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long px, py, bx, by;
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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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long power = std::abs(px - bx) + std::abs(py - by);
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sensors.emplace_back(px, py, power);
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}
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for (auto& s : sensors) {
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for (long q = 0; q <= (s.power + 1) * 2; ++q) {
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auto x = s.x + q - s.power - 1;
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auto y = s.y + q;
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if (isDistressBeacon(Sensor(x, y))) {
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std::cout << x * 4000000 + y << std::endl;
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return 0;
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}
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y -= q * 2;
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if (isDistressBeacon(Sensor(x, y))) {
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std::cout << x * 4000000 + y << std::endl;
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return 0;
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}
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}
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}
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return 0;
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}
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