59 lines
990 B
C++
59 lines
990 B
C++
#include "../../include/aoc.hpp"
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#include <bits/stdc++.h>
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using namespace std;
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unordered_map<icoord, int> m;
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const int smax = 70;
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void rec(icoord c, int score) {
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if (!m.contains(c)) {
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return;
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}
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int &s = m[c];
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if (s != -1 && s <= score) {
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return;
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}
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s = score;
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score++;
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rec(c + icoord(1, 0), score);
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rec(c + icoord(-1, 0), score);
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rec(c + icoord(0, 1), score);
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rec(c + icoord(0, -1), score);
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}
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int main() {
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ios::sync_with_stdio(0);
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cin.tie(0);
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string line;
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bool inits[smax + 1][smax + 1] = {};
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int i = 0;
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while (getline(cin, line) && !line.empty()) {
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// NOTE: found part 2 is just binary search on this number until you
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// stop getting -1 as output
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if (++i > 1024) {
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break;
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}
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istringstream l(line);
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int x, y;
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l >> x;
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l.ignore();
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l >> y;
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inits[x][y] = true;
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}
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for (int x = 0; x <= smax; x++) {
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for (int y = 0; y <= smax; y++) {
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if (!inits[x][y]) {
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m[{x, y}] = -1;
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}
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}
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}
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rec({0, 0}, 0);
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cout << m[{smax, smax}] << '\n';
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}
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