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-rw-r--r--day6/day6.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/day6/day6.c b/day6/day6.c
new file mode 100644
index 0000000..02d75e5
--- /dev/null
+++ b/day6/day6.c
@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main() {
+ int i, j,
+ rs, cs, re, ce,
+ numlights = 0, brightness = 0;
+ int** lights; int** lights2;
+ char istr[10];
+
+ lights = (int**) malloc(1000*sizeof(int*));
+ lights2 = (int**) malloc(1000*sizeof(int*));
+ for(i = 0; i < 1000; i++) {
+ lights[i] = (int*) malloc(1000*sizeof(int));
+ memset(lights[i], 0, 1000);
+ lights2[i] = (int*) malloc(1000*sizeof(int));
+ memset(lights2[i], 0, 1000);
+ }
+
+ while(scanf("%s", istr) != EOF) {
+ if(strncmp(istr, "turn", 4) == 0)
+ scanf("%s %d,%d through %d,%d", istr, &rs, &cs, &re, &ce);
+ else
+ scanf("%d,%d through %d,%d", &rs, &cs, &re, &ce);
+
+ if(strncmp(istr, "on", 2) == 0) {
+ for(i = rs; i <= re; i++)
+ for(j = cs; j <= ce; j++) {
+ lights[i][j] = 1;
+ lights2[i][j] += 1;
+ }
+ } else if(strncmp(istr, "off", 3) == 0) {
+ for(i = rs; i <= re; i++)
+ for(j = cs; j <= ce; j++) {
+ lights[i][j] = 0;
+ if(lights2[i][j]) lights2[i][j] -= 1;
+ }
+ } else if(strncmp(istr, "toggle", 6) == 0) {
+ for(i = rs; i <= re; i++)
+ for(j = cs; j <= ce; j++) {
+ lights[i][j] = !lights[i][j];
+ lights2[i][j] += 2;
+ }
+ }
+ }
+
+ for(i = 0; i < 1000; i++)
+ for(j = 0; j < 1000; j++) {
+ if(lights[i][j]) numlights++;
+ brightness += lights2[i][j];
+ }
+
+ printf("Number of lights that are on: %d\n", numlights);
+ printf("Total brightness: %d\n", brightness);
+
+ for(i = 0; i < 1000; i++) {
+ free(lights[i]);
+ free(lights2[i]);
+ }
+ free(lights);
+ free(lights2);
+
+ return 0;
+}