1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include "../utils.h"
class Fold {
public: Fold(bool axis, int i) : axis(axis), i(i) { }
int i; bool axis;
};
class Dot {
public: Dot(int x, int y) : x(x), y(y) { }
int x, y;
};
void show (std::vector<Dot> dots, bool vis) {
int minx = 99999, maxx = -99999;
int miny = 99999, maxy = -99999;
for (Dot dot : dots) {
minx = std::min(minx, dot.x);
miny = std::min(miny, dot.y);
maxx = std::max(maxx, dot.x);
maxy = std::max(maxy, dot.y);
}
int count = 0;
int sizex = maxx-minx+1;
int sizey = maxy-miny+1;
for (int y=0; y<sizey; y++) {
for (int x=0; x<sizex; x++) {
bool occ = false;
for (Dot dot : dots) {
if (dot.x == x && dot.y == y) {
occ = true; break;
}
}
if (occ) {
count ++;
if (vis) std::cout << "#";
}
else if (vis) std::cout << ".";
}
if (vis) std::cout << std::endl;
}
std::cout << "dots remaining: " << count << std::endl;
}
void fold (std::vector<Dot> &dots, Fold f) {
for (Dot &dot : dots) {
if (f.axis) {
int dist = f.i - dot.x;
if (dist < 0) dot.x = f.i + dist;
}
else {
int dist = f.i - dot.y;
if (dist < 0) dot.y = f.i + dist;
}
}
}
int main (int argc, char * argv[]) {
std::string raw;
std::getline(std::ifstream(argv[1]), raw, '\0');
std::vector<std::string> parts, strdots, strfolds;
split(parts, raw, "\n\n");
split(strdots, parts[0], "\n");
split(strfolds, parts[1], "\n");
std::vector<Dot> dots;
for (auto strdot : strdots) {
std::vector<std::string> xy;
split(xy, strdot, ",");
dots.emplace_back(
std::stoi(xy[0]),
std::stoi(xy[1]));
}
std::vector<Fold> folds;
for (auto strfold : strfolds) {
if (strfold.size() == 0) continue;
std::vector<std::string> com;
split(com, strfold, "=");
folds.emplace_back(
com[0] == "fold along x",
std::stoi(com[1]));
}
int iter = folds.size();
if (argc > 2) iter = atoi(argv[2]);
for (Fold f : folds) {
fold(dots, f);
}
show(dots, true);
return 0;
}
|
