From e163794fdc39c44e38c82f4de4d067dc2356986c Mon Sep 17 00:00:00 2001
From: Mia Herkt <mia@0x0.st>
Date: Mon, 13 Dec 2021 13:46:53 +0100
Subject: [PATCH] Day 13: Add C solution

---
 13/input.txt  | 817 ++++++++++++++++++++++++++++++++++++++++++++++++++
 13/solution.c |  40 +++
 2 files changed, 857 insertions(+)
 create mode 100644 13/input.txt
 create mode 100644 13/solution.c

diff --git a/13/input.txt b/13/input.txt
new file mode 100644
index 0000000..2774d37
--- /dev/null
+++ b/13/input.txt
@@ -0,0 +1,817 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
\ No newline at end of file
diff --git a/13/solution.c b/13/solution.c
new file mode 100644
index 0000000..0439dd1
--- /dev/null
+++ b/13/solution.c
@@ -0,0 +1,40 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+                  int  Q
+               #define  U\
+             x=D[i] >> 32, \
+         y= D[i] & 0xffffffff
+      (const void * A,  const
+   void*B){int64_t a=  *(int64_t
+
+                       *) A,b=*(
+                     int64_t*)B;
+                    return a>b?a
+                   <b?-1:0:1;}
+                  int main(){
+                size_t n=0,a=
+               500,i,l,X=0,Y                         /***/
+              =0,t=0;char c                    /*********/
+              ;int64_t*D=               /***************/
+           malloc(sizeof(          /*******************/
+          int64_t)*a),L,R      /**********************/
+         ,x,y;while(scanf   /************************/
+        ("%ld,%ld\n",&L,   /************************/
+       &R)==2){if(n+1>   /************************/
+      a)D= realloc(D,    /*************/               sizeof(
+    int64_t)*(a+=500))   /**/                ;D[n++]=(L<<32)     |R;}
+   while(scanf("%*"                "[^xy]%c=%ld\n",&c,&L      )==2)
+  {for(i               =0;i<n;i++){U;if(c=='x'&&x>L)      x=2*L-x
+              ;else if(c=='y'&&y>L)y=2*L-y;D[i]=       y|(x<<32)
+ ;}qsort(D,n,sizeof(int64_t),Q);for(i=1,l=D[0      ];i<n;i++)
+  {if(D[i]==l)D[ i ]=-1; l=D[i];}qsort(D       ,n ,sizeof(
+   int64_t),Q);for(i=n;i>0;i--){if(D[i      ]==-1)n=i;}if(
+    !t)t=n;}printf("%lu dots left "     "after first fol"
+     "d instruction\n",t);for(       i=0;i<n;i++){U;x++
+      ;y++;X=x>X ?x:X;Y=y>Y       ?y:Y;}char O[X*Y];
+       memset(O,' ',X*Y      );for(i=0;i<n;i++){U;O
+        [y*X+x]='|';     }free(D);for(i=0;i<Y;i++
+         )printf(     "%.*s\n" ,(int)X,O+i*X);}