Move 2021 into folder

2021/day12/Makefile

@@ -0,0 +1,16 @@
+solution-part%: solution-part%.c
+	gcc $< -o $@ -lm
+
+test1-%: solution-% example1.txt
+	$< example1.txt
+
+test2-%: solution-% example2.txt
+	$< example2.txt
+
+test3-%: solution-% example3.txt
+	$< example3.txt
+
+run-%: solution-% realinput.txt
+	$< realinput.txt
+
+.PHONY: $(patsubst %,run-%, 1 2) $(patsubst %,test-%, 1 2)

2021/day12/example1.txt

@@ -0,0 +1,7 @@
+start-A
+start-b
+A-c
+A-b
+b-d
+A-end
+b-end

2021/day12/example2.txt

@@ -0,0 +1,10 @@
+dc-end
+HN-start
+start-kj
+dc-start
+dc-HN
+LN-dc
+HN-end
+kj-sa
+kj-HN
+kj-dc

2021/day12/example3.txt

@@ -0,0 +1,18 @@
+fs-end
+he-DX
+fs-he
+start-DX
+pj-DX
+end-zg
+zg-sl
+zg-pj
+pj-he
+RW-he
+fs-DX
+pj-RW
+zg-RW
+start-pj
+he-WI
+zg-he
+pj-fs
+start-RW

2021/day12/realinput.txt

@@ -0,0 +1,24 @@
+LA-sn
+LA-mo
+LA-zs
+end-RD
+sn-mo
+end-zs
+vx-start
+mh-mo
+mh-start
+zs-JI
+JQ-mo
+zs-mo
+start-JQ
+rk-zs
+mh-sn
+mh-JQ
+RD-mo
+zs-JQ
+vx-sn
+RD-sn
+vx-mh
+JQ-vx
+LA-end
+JQ-sn

2021/day12/solution-part1.c

@@ -0,0 +1,163 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
+typedef struct VertexList VertexList;
+typedef struct Vertex Vertex;
+
+struct Vertex{
+	char name[10];
+	VertexList *adjacent;
+	bool bigCave;
+	bool visited;
+};
+
+struct VertexList{
+	Vertex *vertex;
+	//This next pointer is to create a linked list of verticies, it does not reperesent graph position or adjacency
+	VertexList *next;
+
+};
+
+
+void printVertexList(VertexList *start){
+	VertexList *next = start;
+	while (next != NULL){
+		if ( next->vertex->bigCave ) printf(ANSI_COLOR_RED);
+		printf("%s ",next->vertex->name);
+		if ( next->vertex->bigCave ) printf(ANSI_COLOR_RESET);
+		next=next->next;
+	}
+	printf("\n");
+}
+
+int indexOf(VertexList *first, char *name ){
+	VertexList *current = first;
+	for ( unsigned int count = 0; current != NULL; count++ ){
+		if ( strcmp(current->vertex->name, name) == 0 ) return count;
+		else current = current->next;
+	}
+
+	return -1;
+}
+
+Vertex* getVertex(VertexList *first, char name[20]){
+	VertexList *current = first;
+	while ( current != NULL ){
+		if ( strcmp(current->vertex->name, name) == 0 ) return current->vertex;
+		else current = current->next;
+	}
+	return NULL;
+}
+
+Vertex* newVertex(char name[20]){
+	Vertex *new = (Vertex*)malloc(sizeof(Vertex));
+	new->adjacent = NULL;
+	new->visited = false;
+	new->bigCave = ( name[0] >= 'A' && name[0] <= 'Z' );
+	strcpy(new->name,name);
+	return new;
+}
+
+VertexList* newVertexListItem(Vertex *virtex){
+	VertexList *newList = (VertexList*)malloc(sizeof(VertexList));
+	newList->next = NULL;
+	newList->vertex = virtex;
+	return newList;
+}
+
+VertexList* getLast(VertexList *current){
+	if ( current == NULL ) return NULL;
+	while ( current->next != NULL ) current = current->next;
+	return current;
+}
+
+unsigned int countPaths(Vertex *current){
+	// This is the break for the recursion - when we reach the end
+	if ( strcmp( current->name, "end" ) == 0 ) return 1;
+
+	current->visited = true;
+
+	unsigned int count = 0;
+	VertexList *toTry = current->adjacent;
+	while ( toTry != NULL ){
+		if ( toTry->vertex->bigCave || !toTry->vertex->visited )
+			count += countPaths(toTry->vertex);
+		toTry = toTry->next;
+	}
+
+
+	current->visited = false;
+	return count;
+}
+
+int main( int argc, char *argv[] ){
+	if( argc == 2 ) {
+
+		VertexList *firstVirtex = NULL;
+		VertexList *lastVertex = getLast(firstVirtex);
+
+		FILE *fp=fopen(argv[1], "r");
+
+		if ( fp == NULL ) {
+			return 1;
+		}
+
+		char vertex1[20];
+		char vertex2[20];
+		char vertexStart[20] = "start";
+		Vertex *v1, *v2;
+		while ( !feof(fp) && fscanf( fp, "%[^-]-%s\n", vertex1,vertex2 )  ){
+			//Ensures the first virtex exists
+			v1 = getVertex(firstVirtex, vertex1);
+			v2 = getVertex(firstVirtex, vertex2);
+			if ( v1 == NULL ){
+				v1 = newVertex(vertex1);
+				if ( firstVirtex == NULL ){
+					firstVirtex = newVertexListItem(v1);
+					lastVertex = firstVirtex;
+				} else {
+					lastVertex->next = newVertexListItem(v1);
+					lastVertex = lastVertex->next;
+				}
+			}
+			//Ensures the second vertex exists
+			if ( v2 == NULL ){
+				v2 = newVertex(vertex2);
+				lastVertex->next = newVertexListItem(v2);
+				lastVertex = lastVertex->next;
+			}
+
+			//Links v1 and v2
+			if ( v1->adjacent == NULL ){
+				v1->adjacent = newVertexListItem(v2);
+			} else if ( indexOf(v1->adjacent, v2->name) < 0 ) {
+				getLast(v1->adjacent)->next = newVertexListItem(v2);
+			}
+
+			if ( v2->adjacent == NULL ){
+				v2->adjacent = newVertexListItem(v1);
+			} else if ( indexOf(v2->adjacent, v1->name) < 0 ) {
+				getLast(v2->adjacent)->next = newVertexListItem(v1);
+			}
+
+			//break;
+		}
+
+		printVertexList(firstVirtex);
+
+		printf("\n\nThere are %i valid paths", countPaths(getVertex(firstVirtex, vertexStart)));
+
+		fclose(fp);
+
+		return 0;
+	} else {
+		printf("You need to provide a file\n");
+		return 1;
+	}
+}

2021/day12/solution-part2.c

@@ -0,0 +1,167 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
+typedef struct VertexList VertexList;
+typedef struct Vertex Vertex;
+
+struct Vertex{
+	char name[10];
+	VertexList *adjacent;
+	bool bigCave;
+	unsigned int visited;
+};
+
+struct VertexList{
+	Vertex *vertex;
+	//This next pointer is to create a linked list of verticies, it does not reperesent graph position or adjacency
+	VertexList *next;
+
+};
+
+
+void printVertexList(VertexList *start){
+	VertexList *next = start;
+	while (next != NULL){
+		if ( next->vertex->bigCave ) printf(ANSI_COLOR_RED);
+		printf("%s ",next->vertex->name);
+		if ( next->vertex->bigCave ) printf(ANSI_COLOR_RESET);
+		next=next->next;
+	}
+	printf("\n");
+}
+
+int indexOf(VertexList *first, char *name ){
+	VertexList *current = first;
+	for ( unsigned int count = 0; current != NULL; count++ ){
+		if ( strcmp(current->vertex->name, name) == 0 ) return count;
+		else current = current->next;
+	}
+
+	return -1;
+}
+
+Vertex* getVertex(VertexList *first, char name[20]){
+	VertexList *current = first;
+	while ( current != NULL ){
+		if ( strcmp(current->vertex->name, name) == 0 ) return current->vertex;
+		else current = current->next;
+	}
+	return NULL;
+}
+
+Vertex* newVertex(char name[20]){
+	Vertex *new = (Vertex*)malloc(sizeof(Vertex));
+	new->adjacent = NULL;
+	new->visited = 0;
+	new->bigCave = ( name[0] >= 'A' && name[0] <= 'Z' );
+	strcpy(new->name,name);
+	return new;
+}
+
+VertexList* newVertexListItem(Vertex *virtex){
+	VertexList *newList = (VertexList*)malloc(sizeof(VertexList));
+	newList->next = NULL;
+	newList->vertex = virtex;
+	return newList;
+}
+
+VertexList* getLast(VertexList *current){
+	if ( current == NULL ) return NULL;
+	while ( current->next != NULL ) current = current->next;
+	return current;
+}
+
+unsigned int countPaths(Vertex *current, bool smallVisitedTwice){
+	// This is the break for the recursion - when we reach the end
+	if ( strcmp( current->name, "end" ) == 0 ) return 1;
+
+	current->visited++;
+
+	unsigned int count = 0;
+	VertexList *toTry = current->adjacent;
+	while ( toTry != NULL ){
+		if ( toTry->vertex->bigCave || toTry->vertex->visited == 0 )
+			count += countPaths(toTry->vertex, smallVisitedTwice);
+		else if ( !smallVisitedTwice && toTry->vertex->visited < 2 && strcmp(toTry->vertex->name, "start") != 0 ) {
+			count += countPaths(toTry->vertex, true);
+		}
+
+		toTry = toTry->next;
+	}
+
+
+	current->visited--;
+	return count;
+}
+
+int main( int argc, char *argv[] ){
+	if( argc == 2 ) {
+
+		VertexList *firstVirtex = NULL;
+		VertexList *lastVertex = getLast(firstVirtex);
+
+		FILE *fp=fopen(argv[1], "r");
+
+		if ( fp == NULL ) {
+			return 1;
+		}
+
+		char vertex1[20];
+		char vertex2[20];
+		char vertexStart[20] = "start";
+		Vertex *v1, *v2;
+		while ( !feof(fp) && fscanf( fp, "%[^-]-%s\n", vertex1,vertex2 )  ){
+			//Ensures the first virtex exists
+			v1 = getVertex(firstVirtex, vertex1);
+			v2 = getVertex(firstVirtex, vertex2);
+			if ( v1 == NULL ){
+				v1 = newVertex(vertex1);
+				if ( firstVirtex == NULL ){
+					firstVirtex = newVertexListItem(v1);
+					lastVertex = firstVirtex;
+				} else {
+					lastVertex->next = newVertexListItem(v1);
+					lastVertex = lastVertex->next;
+				}
+			}
+			//Ensures the second vertex exists
+			if ( v2 == NULL ){
+				v2 = newVertex(vertex2);
+				lastVertex->next = newVertexListItem(v2);
+				lastVertex = lastVertex->next;
+			}
+
+			//Links v1 and v2
+			if ( v1->adjacent == NULL ){
+				v1->adjacent = newVertexListItem(v2);
+			} else if ( indexOf(v1->adjacent, v2->name) < 0 ) {
+				getLast(v1->adjacent)->next = newVertexListItem(v2);
+			}
+
+			if ( v2->adjacent == NULL ){
+				v2->adjacent = newVertexListItem(v1);
+			} else if ( indexOf(v2->adjacent, v1->name) < 0 ) {
+				getLast(v2->adjacent)->next = newVertexListItem(v1);
+			}
+
+			//break;
+		}
+
+		printVertexList(firstVirtex);
+
+		printf("\n\nThere are %i valid paths", countPaths(getVertex(firstVirtex, vertexStart), false));
+
+		fclose(fp);
+
+		return 0;
+	} else {
+		printf("You need to provide a file\n");
+		return 1;
+	}
+}