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day7p1

master
mid-kid 7 years ago
parent
ad2b3d47a3
commit
56ec25613c
3 changed files with 220 additions and 0 deletions
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  1. 12
      day7p1/Makefile
  2. 101
      day7p1/input
  3. 107
      day7p1/main.c

12
day7p1/Makefile
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CFLAGS := -Wall -Wextra -std=c17 -D_GNU_SOURCE
LIBS := glib-2.0
CFLAGS += $(shell pkg-config --cflags $(LIBS))
LDLIBS := $(shell pkg-config --libs $(LIBS))
.PHONY: all
all: main
.PHONY: clean
clean:
rm -f main

101
day7p1/input
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Step J must be finished before step H can begin.
Step N must be finished before step C can begin.
Step G must be finished before step P can begin.
Step M must be finished before step I can begin.
Step H must be finished before step X can begin.
Step B must be finished before step Y can begin.
Step C must be finished before step L can begin.
Step F must be finished before step I can begin.
Step V must be finished before step O can begin.
Step W must be finished before step Q can begin.
Step E must be finished before step L can begin.
Step U must be finished before step S can begin.
Step D must be finished before step K can begin.
Step Y must be finished before step X can begin.
Step T must be finished before step R can begin.
Step I must be finished before step K can begin.
Step A must be finished before step K can begin.
Step L must be finished before step X can begin.
Step Q must be finished before step S can begin.
Step S must be finished before step O can begin.
Step P must be finished before step Z can begin.
Step X must be finished before step R can begin.
Step Z must be finished before step O can begin.
Step O must be finished before step K can begin.
Step R must be finished before step K can begin.
Step J must be finished before step W can begin.
Step F must be finished before step V can begin.
Step A must be finished before step X can begin.
Step Z must be finished before step K can begin.
Step M must be finished before step O can begin.
Step X must be finished before step K can begin.
Step E must be finished before step K can begin.
Step J must be finished before step K can begin.
Step E must be finished before step Y can begin.
Step B must be finished before step Q can begin.
Step X must be finished before step Z can begin.
Step D must be finished before step L can begin.
Step N must be finished before step I can begin.
Step N must be finished before step B can begin.
Step V must be finished before step A can begin.
Step H must be finished before step R can begin.
Step N must be finished before step L can begin.
Step U must be finished before step O can begin.
Step A must be finished before step O can begin.
Step V must be finished before step Z can begin.
Step O must be finished before step R can begin.
Step Q must be finished before step P can begin.
Step F must be finished before step Q can begin.
Step P must be finished before step R can begin.
Step S must be finished before step X can begin.
Step J must be finished before step E can begin.
Step V must be finished before step P can begin.
Step M must be finished before step D can begin.
Step I must be finished before step S can begin.
Step Q must be finished before step O can begin.
Step M must be finished before step H can begin.
Step W must be finished before step X can begin.
Step D must be finished before step O can begin.
Step X must be finished before step O can begin.
Step Y must be finished before step Z can begin.
Step F must be finished before step L can begin.
Step V must be finished before step T can begin.
Step V must be finished before step E can begin.
Step Y must be finished before step A can begin.
Step I must be finished before step R can begin.
Step L must be finished before step O can begin.
Step U must be finished before step X can begin.
Step Q must be finished before step X can begin.
Step P must be finished before step X can begin.
Step G must be finished before step C can begin.
Step A must be finished before step L can begin.
Step M must be finished before step U can begin.
Step L must be finished before step S can begin.
Step S must be finished before step P can begin.
Step S must be finished before step K can begin.
Step F must be finished before step T can begin.
Step Q must be finished before step K can begin.
Step G must be finished before step M can begin.
Step G must be finished before step F can begin.
Step T must be finished before step Q can begin.
Step F must be finished before step Z can begin.
Step I must be finished before step Z can begin.
Step N must be finished before step X can begin.
Step J must be finished before step F can begin.
Step W must be finished before step E can begin.
Step M must be finished before step Z can begin.
Step G must be finished before step X can begin.
Step V must be finished before step U can begin.
Step P must be finished before step O can begin.
Step U must be finished before step R can begin.
Step G must be finished before step Z can begin.
Step F must be finished before step R can begin.
Step L must be finished before step R can begin.
Step F must be finished before step A can begin.
Step I must be finished before step O can begin.
Step D must be finished before step T can begin.
Step U must be finished before step L can begin.
Step B must be finished before step S can begin.
Step S must be finished before step Z can begin.
Step J must be finished before step N can begin.
Step H must be finished before step T can begin.

107
day7p1/main.c
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#include <stdio.h>
#include <glib.h>
struct action {
int id;
GPtrArray *depends;
GPtrArray *required_by;
};
void free_action(gpointer data)
{
struct action *action = (struct action *)data;
g_ptr_array_free(action->depends, TRUE);
g_ptr_array_free(action->required_by, TRUE);
g_free(action);
}
struct action *get_action(GHashTable *table, int id)
{
struct action *action = g_hash_table_lookup(table, GINT_TO_POINTER(id));
if (action) return action;
action = g_malloc(sizeof(struct action));
action->depends = g_ptr_array_new();
action->required_by = g_ptr_array_new();
action->id = id;
g_hash_table_insert(table, GINT_TO_POINTER(id), action);
return action;
}
gint compare_action(gconstpointer _a, gconstpointer _b)
{
struct action *a = *(struct action **)_a;
struct action *b = *(struct action **)_b;
return a->id - b->id;
}
GHashTable *parse_tree(const char *fname)
{
FILE *f = fopen(fname, "r");
if (!f) {
perror(fname);
return NULL;
}
GHashTable *table = g_hash_table_new_full(NULL, NULL, NULL, free_action);
char *line = NULL;
size_t line_len = 0;
while (getline(&line, &line_len, f) != -1) {
char depends = 0;
char required_by = 0;
sscanf(line, "Step %c must be finished before step %c can begin.",
&depends, &required_by);
struct action *dependent = get_action(table, depends);
struct action *required = get_action(table, required_by);
g_ptr_array_add(dependent->required_by, required);
g_ptr_array_add(required->depends, dependent);
}
free(line);
fclose(f);
return table;
}
int main()
{
GHashTable *table = parse_tree("input");
if (!table) return 1;
GPtrArray *queue = g_ptr_array_new();
GString *result = g_string_new(NULL);
// Find items without dependencies
GHashTableIter iter;
gpointer key, value;
g_hash_table_iter_init(&iter, table);
while (g_hash_table_iter_next(&iter, &key, &value)) {
struct action *action = (struct action *)value;
if (action->depends->len == 0) {
g_ptr_array_add(queue, action);
}
}
while (queue->len) {
g_ptr_array_sort(queue, compare_action);
struct action *action = g_ptr_array_remove_index_fast(queue, 0);
g_string_append_c(result, action->id);
for (unsigned i = 0; i < action->required_by->len; i++) {
struct action *next = g_ptr_array_index(action->required_by, i);
g_ptr_array_remove_fast(next->depends, action);
if (next->depends->len == 0) g_ptr_array_add(queue, next);
}
}
puts(result->str);
g_string_free(result, TRUE);
g_ptr_array_free(queue, TRUE);
g_hash_table_destroy(table);
return 0;
}
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