Day 8 attempt 1 is proof that I should get some sleep. I totally forgot about a couple things and this is hack-n-slashed together nonsense.
This commit is contained in:
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2139a01252
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2
2022/8/Makefile
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2
2022/8/Makefile
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a.out: main.cpp
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clang++ -std=c++2b -g -O0 main.cpp
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99
2022/8/data.txt
Normal file
99
2022/8/data.txt
Normal file
@ -0,0 +1,99 @@
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020110220332333020110144320304042020444223003535441353331002333431100300241023221210123003331021020
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002120010112022233203323334422340102033151553341235324543343233301202102130210343113312320222102020
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000000000301021002423224442341031145215244543444223314545524515335404222310244314423023331200102012
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110111200102310120411101020333232255345143342245212323552344535253214434143032323213200301101020121
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122021200131211021314010312001241211235253115315252213451111223452204220130001212341202130012001221
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163
2022/8/main.cpp
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2022/8/main.cpp
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#include <fstream>
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#include <iostream>
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#include <set>
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#include <string>
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#include <vector>
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int main()
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{
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std::ifstream ifs("data.txt");
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if(!ifs.is_open())
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{
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std::cerr << "Missing data.txt." << std::endl;
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return -1;
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}
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unsigned long total = 0;
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unsigned long total_pt2 = 0;
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std::vector<std::vector<int>> trees;
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// Parse:
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for(std::string line; std::getline(ifs, line); )
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{
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if(line == "")
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continue;
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trees.push_back({});
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for(const char &ch : line)
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trees.back().push_back(ch - '0');
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}
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total += 2 * trees.size();
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total += 2 * (trees[0].size() - 2);
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std::set<std::pair<int, int>> visible_coordinates;
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// NOTE(dev):
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#warning This shit is wrong because it's only finding the FIRST visible tree, not all visible trees.
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#warning e.g. If you have 2003005003007004005
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#warning ^ ^ ^ ^ are all visible from the left
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#warning ^ is visible from the right
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// left to right, right to left IN EACH ROW:
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for(auto y = 1; y < trees.size() - 1; ++y)
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{
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auto x = 1;
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bool found_from_left = false;
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while(x < trees[y].size() - 1)
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{
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std::cout << trees[y][x];
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if(trees[y][x] < trees[y][x-1])
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break;
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found_from_left = true;
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++x;
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}
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if(found_from_left)
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{
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// make sure it isn't the right-most, as that's already counted
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if(x == trees[y].size() - 1)
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{
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if(trees[y][x] < trees[y][x-1])
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{
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std::cout << ": insert {" << (x - 1) << "," << y << "}"
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<< "(" << trees[y][x-1] << ")";
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visible_coordinates.insert({x - 1, y});
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}
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}
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else
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{
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std::cout << ": insert {" << (x - 1) << "," << y << "}"
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<< "(" << trees[y][x-1] << ")";
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visible_coordinates.insert({x - 1, y});
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// NOTE(dev): Only search from the right if there's still room to search:
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bool found_from_right = false;
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auto found_x = x - 1;
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x = trees[y].size() - 2;
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while(x > found_x)
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{
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if(trees[y][x] < trees[y][x + 1])
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break;
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found_from_right = true;
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--x;
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}
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if(found_from_right)
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{
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std::cout << ": insert {" << (x + 1) << "," << y << "}"
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<< "(" << trees[y][x+1] << ")";
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visible_coordinates.insert({x + 1, y});
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}
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}
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}
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std::cout << std::endl;
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}
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// top to bottom, bottom to top IN EACH COLUMN:
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for(auto x = 1; x < trees[0].size() - 1; ++x)
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{
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auto y = 1;
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bool found_from_top = false;
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while(y < trees.size() - 1)
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{
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if(trees[y][x] < trees[y-1][x])
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break;
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found_from_top = true;
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++x;
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}
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if(found_from_top)
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{
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// make sure it isn't the bottom-most, as that's already counted
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if(y == trees.size() - 1)
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{
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if(trees[y][x] < trees[y-1][x])
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{
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std::cout << ": insert {" << x << "," << (y - 1) << "}"
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<< "(" << trees[y-1][x] << ")";
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visible_coordinates.insert({x, y - 1});
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}
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}
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else
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{
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std::cout << ": insert {" << x << "," << (y - 1) << "}"
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<< "(" << trees[y-1][x] << ")";
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visible_coordinates.insert({x, y - 1});
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// NOTE(dev): Only search from the bottom if there's still room to search:
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bool found_from_bottom = false;
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auto found_y = y - 1;
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y = trees.size() - 2;
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while(y > found_y)
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{
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if(trees[y][x] < trees[y + 1][x])
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break;
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found_from_bottom = true;
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--y;
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}
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if(found_from_bottom)
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{
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std::cout << ": insert {" << x << "," << (y + 1) << "}"
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<< "(" << trees[y+1][x] << ")";
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visible_coordinates.insert({x, y + 1});
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}
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}
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}
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}
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total += visible_coordinates.size();
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// // track interior
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// for(auto y = 1; y < trees.size() - 1; ++y)
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// {
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// // left & right, first
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// for(auto x = 1; x < trees[y].size() - 1; ++x)
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// {
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// }
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// }
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std::cout << " Total: " << total << std::endl;
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std::cout << "PT2 Total: " << total_pt2 << std::endl;
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return 0;
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}
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Block a user