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#include <stdio.h>
#include <stdbool.h>
#include "d.h"
#include "map.h"
#include "graph.h"
bool debug = true;
/* This is the stuff of ideas.
typedef struct Stack {
void* value;
struct Stack* below;
} Stack;
Stack*
pop(Stack* s) {
free(s->value);
Stack* tmp = s->below;
free(s);
return tmp;
}
Stack*
push(Stack* s, void* value) {
Stack* t = calloc(1, sizeof(Stack));
t->below = s;
t->value = value;
return t;
} */
// This global will die.
int score = 0;
void
travel(Graph2D* g, Coordinates c)
{
// Utility TBD
// g->visited[c.y][c.x] = true;
if (debug) {
printf("%d,%d\n", c.x, c.y);
printf("%c\n", g->e[c.y][c.x]);
}
Coordinates cardinal[DIRECTIONS];
cardinal[SOUTH] = (Coordinates) {c.x, c.y + 1};
cardinal[NORTH] = (Coordinates) {c.x, c.y - 1};
cardinal[EAST] = (Coordinates) {c.x + 1, c.y};
cardinal[WEST] = (Coordinates) {c.x - 1, c.y};
if (g->e[c.y][c.x] == '9') {
score++;
return;
}
for (int i = 0; i < DIRECTIONS; i++) {
if (graph_valid(g, cardinal[i])) {
if (debug) {
printf("%d,%d\n", cardinal[i].x, cardinal[i].y);
printf("%d\n", g->e[cardinal[i].y][cardinal[i].x]);
printf("-\n");
printf("%d\n", g->e[c.y][c.x]);
printf("%d\n", g->e[cardinal[i].y][cardinal[i].x] - g->e[c.y][c.x]);
}
if (g->e[cardinal[i].y][cardinal[i].x] - g->e[c.y][c.x] == 1) {
if (debug) {
printf("Valid: %d,%d\n", cardinal[i].x, cardinal[i].y);
}
travel(g, cardinal[i]);
}
}
}
return;
}
int
main()
{
FILE* in = fopen("sample_small", "r");
if (in == NULL) {
exit(1);
}
Graph2D* g = graph_ingest(in);
/* Hash map from Coordinates of each starting point to their scores.
Pass to each travel, along with launch coordinates. */
hashmap* map = hashmap_create();
for (int i = 0; i < g->height; i++) {
for (int j = 0; j < g->width; j++) {
if (g->e[i][j] == '0') {
travel(g, (Coordinates) {j, i});
// Score is a global
printf("%d\n", score);
}
}
}
return 0;
}
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