2018/Day16/Day16A.c

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C
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2018-12-16 19:33:22 +00:00
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <inttypes.h>
typedef struct {
uint8_t before[4];
uint8_t opcode;
uint8_t a, b, c;
uint8_t after[4];
} Sample;
int sample_read(Sample *sample, FILE *file) {
int read = 0;
read +=
fscanf(file,
"Before: [%" SCNu8 ", %" SCNu8 ", %" SCNu8 ", %" SCNu8 "]\n",
&sample->before[0], &sample->before[1], &sample->before[2],
&sample->before[3]);
read += fscanf(file, "%" SCNu8 " %" SCNu8 " %" SCNu8 " %" SCNu8 "\n",
&sample->opcode, &sample->a, &sample->b, &sample->c);
read +=
fscanf(file,
"After: [%" SCNu8 ", %" SCNu8 ", %" SCNu8 ", %" SCNu8 "]\n\n",
&sample->after[0], &sample->after[1], &sample->after[2],
&sample->after[3]);
return read == 12;
}
void sample_print(const Sample sample) {
printf(
"{\n"
" before: [%d, %d, %d, %d],\n"
" opcode: %d, a: %d, b: %d, c: %d,\n"
" after: [%d, %d, %d, %d]\n"
"}\n",
sample.before[0], sample.before[1], sample.before[2], sample.before[3],
sample.opcode, sample.a, sample.b, sample.c,
sample.after[0], sample.after[1], sample.after[2], sample.after[3]
);
}
int sample_possible_opcodes(const Sample s) {
int possible_opcodes = 0;
// Addition
if (s.after[s.c] == s.before[s.a] + s.before[s.b]) {
printf("addr, ");
possible_opcodes += 1;
}
if (s.after[s.c] == s.before[s.a] + s.b) {
printf("addi, ");
possible_opcodes += 1;
}
// Multiplication
if (s.after[s.c] == s.before[s.a] * s.before[s.b]) {
printf("mulr, ");
possible_opcodes += 1;
}
if (s.after[s.c] == s.before[s.a] * s.b) {
printf("muli, ");
possible_opcodes += 1;
}
// Bitwise AND
if (s.after[s.c] == (s.before[s.a] & s.before[s.b])) {
printf("banr, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] & s.b)) {
printf("bani, ");
possible_opcodes += 1;
}
// Bitwise OR
if (s.after[s.c] == (s.before[s.a] | s.before[s.b])) {
printf("borr, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] | s.b)) {
printf("bori, ");
possible_opcodes += 1;
}
// Assignment
if (s.after[s.c] == s.before[s.a]) {
printf("setr, ");
possible_opcodes += 1;
}
if (s.after[s.c] == s.a) {
printf("seti, ");
possible_opcodes += 1;
}
// Greater-than testing
if (s.after[s.c] == (s.a > s.before[s.b])) {
printf("gtir, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] > s.b)) {
printf("gtri, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] > s.before[s.b])) {
printf("gtrr, ");
possible_opcodes += 1;
}
// Equality testing
if (s.after[s.c] == (s.a == s.before[s.b])) {
printf("eqir, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] == s.b)) {
printf("eqri, ");
possible_opcodes += 1;
}
if (s.after[s.c] == (s.before[s.a] == s.before[s.b])) {
printf("eqrr, ");
possible_opcodes += 1;
}
return possible_opcodes;
}
int main(int argc, char **argv) {
if (argc != 2) {
printf("Usage: %s [input]\n", argv[0]);
return EXIT_FAILURE;
}
FILE *file = fopen(argv[1], "r");
Sample sample = {0};
int gt3 = 0, samples = 0;
while (sample_read(&sample, file)) {
sample_print(sample);
int possible_opcodes = sample_possible_opcodes(sample);
printf("%d possible opcodes.\n\n", possible_opcodes);
if (possible_opcodes >= 3) {
gt3 += 1;
}
samples += 1;
}
printf("%d samples\n", samples);
printf("%d\n", gt3);
fclose(file);
return EXIT_SUCCESS;
}