From: Mart Lubbers Date: Fri, 3 Dec 2021 08:47:40 +0000 (+0100) Subject: :day 3 X-Git-Url: https://git.martlubbers.net/?a=commitdiff_plain;h=38822928901ae7d3ea1377fbcbe3d4fc371bc55d;p=advent21.git :day 3 --- diff --git a/03a.c b/03a.c new file mode 100644 index 0000000..b11cc02 --- /dev/null +++ b/03a.c @@ -0,0 +1,28 @@ +#include + +int main(void) +{ + int bits[100] = {0}; + int i = 0, maxi = 0, c; + while ((c = getchar()) != EOF) { + if (c == '0') + bits[i++] -= 1; + else if (c == '1') + bits[i++] += 1; + else if (c == '\n') + i = 0; + maxi = i > maxi ? i : maxi; + } + + int gamma = 0, epsilon = 0; + for (int j = 0; j 0) + gamma++; + else + epsilon++; + } + printf("%d\n", gamma*epsilon); + return 0; +} diff --git a/03b.c b/03b.c new file mode 100644 index 0000000..c940822 --- /dev/null +++ b/03b.c @@ -0,0 +1,56 @@ +#include +#include + +#define bitread(value, bit) (((value) >> (bit)) & 0x01) + +int incremental_search(unsigned numbers[], int len, int bits, bool inv) +{ + //Copy for the initial search + int cur[len]; + int curlen; + for (curlen = 0; curlen= 0 || curlen > 1; bit--) { + //Determine 0 1 distribution + int dist = 0; + for (int i = 0; i= 0; + dist = inv ? 1-dist : dist; + + //Filter out numbers + int newcurlen = 0; + for (int i = 0; i maxbits ? bits : maxbits; + bits = 0; + y++; + } + } + + int oxygen = incremental_search(numbers, y, maxbits, false); + int co2 = incremental_search(numbers, y, maxbits, true); + + printf("%d\n", oxygen*co2); + return 0; +} diff --git a/3.txt b/3.txt new file mode 100644 index 0000000..f398604 --- /dev/null +++ b/3.txt @@ -0,0 +1,1000 @@ +010111111011 +010010101110 +011001001100 +001000001010 +111100101000 +111010101100 +000111101111 +010011010011 +100010111011 +101011000111 +100111101010 +101101101101 +110010110110 +100110011100 +001110011000 +011000101010 +001100111101 +100011101111 +100111011001 +011100101101 +111101000111 +111000101011 +001001000101 +010110011000 +110100100001 +010010010011 +100100100100 +011011001000 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-CFLAGS=-Wall -Wextra +CFLAGS:=-Wall -Wextra -O3 +LFLAGS:=-f -BINARIES:=01 02a 02b +BINARIES:=01 02a 02b 03a 03b all: $(BINARIES)