C: 2015 day 03 complete

2015/day03/day03.c

@@ -2,6 +2,7 @@
 
 void part1() {
   printf("Part 1\n");
+
   char ch = getchar();
   int visits[1000][1000];
   for(int i = 0; i < 1000; i++) {
@@ -11,7 +12,6 @@ void part1() {
   }
   int x = 0, y = 0, minx = 0, maxx = 0, miny = 0, maxy = 0;
   int inc = 0;
-  printf("(%4d,%4d) (%4d:%4d,%4d:%4d)", x, y, minx, maxx, miny, maxy);
   while(ch) {
     visits[x+500][y+500]++;
     if(ch == '\n') { break; }
@@ -56,6 +56,76 @@ void part1() {
 
 void part2() {
   printf("Part 2\n");
+  char ch = getchar();
+  int visits[1000][1000];
+  for(int i = 0; i < 1000; i++) {
+    for(int j = 0; j < 1000; j++) {
+      visits[i][j] = 0;
+    }
+  }
+  int x1 = 0, y1 = 0, x2 = 0, y2 = 0, minx = 0, maxx = 0, miny = 0, maxy = 0;
+  int inc = 0;
+  int robo = -1;
+  int lastOutLngth = 0;
+  while(ch) {
+    robo++;
+    int usex = x1, usey = y1;
+    if(robo % 2 == 1) {
+      usex = x2;
+      usey = y2;
+    }
+    visits[usex+500][usey+500]++;
+    if(ch == '\n') { break; }
+
+    switch(ch) {
+    case '>':
+      usex++;
+      break;
+    case 'v':
+      usey--;
+      break;
+    case '<':
+      usex--;
+      break;
+    case '^':
+      usey++;
+      break;
+    }
+
+    if(usex > maxx) {
+      maxx = usex;
+    }
+    if(usex < minx) {
+      minx = usex;
+    }
+    if(usey > maxy) {
+      maxy = usey;
+    }
+    if(usey < miny) {
+      miny = usey;
+    }
+    // Get the next char
+    if(robo % 2 == 1) {
+      x2 = usex;
+      y2 = usey;
+    } else {
+      x1 = usex;
+      y1 = usey;
+    }
+    ch = getchar();
+  }
+
+  // Now find how many houses got presents
+  int result = 0;
+  for(int i = 0; i < 1000; i++) {
+    for(int j = 0; j < 1000; j++) {
+      if(visits[i][j] > 0) {
+        result++;
+      }
+    }
+  }
+
+  printf("%d houses\n", result);
 }
 
 int main(int argc, char **argv) {