75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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/*
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synacor.py - An implementation of the Synacor Challenge
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Copyright © 2016 RunasSudo
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU Affero General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <pthread.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#define NUM_THREADS 8
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static uint16_t A(uint16_t R1, uint16_t R2, uint16_t R8, uint16_t cache[5][0x8000]) {
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if (cache[R1][R2] != 0xffff) {
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return cache[R1][R2];
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}
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if (R1 == 0)
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return (R2 + 1) & 0x7fff;
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if (R2 == 0)
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return A(R1 - 1, R8, R8, cache);
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return A(R1 - 1, cache[R1][R2 - 1] = A(R1, R2 - 1, R8, cache), R8, cache);
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}
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static void* bruteThread(void* rmdrVoid) {
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uint16_t rmdr;
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uint16_t cache[5][0x8000];
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uint16_t R8;
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rmdr = *((int *) rmdrVoid);
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for (R8 = rmdr; R8 <= 0x7fff; R8 += NUM_THREADS) {
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memset(cache, 0xff, sizeof(cache)); /* Clear the cache */
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if (!(R8 & 0xff))
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printf("%04x...\n", R8);
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if (A(4, 1, R8, cache) == 6)
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printf("Found a solution! %04x...\n", R8);
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}
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}
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int main() {
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pthread_t threads[NUM_THREADS];
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int thread_args[NUM_THREADS];
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int i;
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for (i = 0; i < NUM_THREADS; i++) {
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printf("Spawning thread %d...\n", i);
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thread_args[i] = i; /* rmdr */
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pthread_create(&threads[i], NULL, bruteThread, (void*) &thread_args[i]);
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}
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/* wait */
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for (i = 0; i < NUM_THREADS; i++) {
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pthread_join(threads[i], NULL);
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}
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printf("Search complete\n");
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}
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