diff --git a/day23/c/day23 b/day23/c/day23
new file mode 100755
index 0000000..539cc96
Binary files /dev/null and b/day23/c/day23 differ
diff --git a/day23/c/day23.c b/day23/c/day23.c
new file mode 100644
index 0000000..a813807
--- /dev/null
+++ b/day23/c/day23.c
@@ -0,0 +1,199 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CHARS_MAX 6
+#define MAX_LINKS 16*1024
+#define MAX_NODES 8*1024
+
+typedef struct link {
+    char left[2];
+    char right[2];
+} link_t;
+
+int cmp(const void* a, const void* b) {
+    const char (*pa)[2] = a;
+    const char (*pb)[2] = b;
+
+    if ((*pa)[0] != (*pb)[0]) {
+        return (*pa)[0] - (*pb)[0];
+    }
+
+    return (*pa)[1] - (*pb)[1];
+}
+
+int main() {
+    char *p, *buf, c;
+
+    buf = calloc(CHARS_MAX, sizeof(char));
+    p = buf;
+
+    link_t *links = calloc(MAX_LINKS, sizeof(link_t));
+    int link_count = 0;
+
+    while ((c = getchar()) != EOF) {
+        *p++ = c;
+        if (c != '\n') {
+            continue;
+        }
+
+        links[link_count].left[0] = buf[0];
+        links[link_count].left[1] = buf[1];
+        links[link_count].right[0] = buf[3];
+        links[link_count].right[1] = buf[4];
+        link_count++;
+
+        memset(buf, 0, CHARS_MAX);
+        p = buf;
+    }
+
+    free(buf);
+
+    // Find unique nodes
+    char (*nodes)[2] = calloc(MAX_NODES, sizeof(nodes[0]));
+    int node_count = 0;
+
+    for (int i = 0; i < link_count; i++) {
+        // Add left
+        int found = 0;
+        for (int j = 0; j < node_count; j++) {
+            if (!memcmp(nodes[j], links[i].left, sizeof(nodes[0]))) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            memcpy(nodes[node_count++], links[i].left, sizeof(nodes[0]));
+        }
+        // Right
+        found = 0;
+        for (int j = 0; j < node_count; j++) {
+            if (!memcmp(nodes[j], links[i].right, sizeof(nodes[0]))) {
+                found = 1;
+                break;
+            }
+        }
+        if (!found) {
+            memcpy(nodes[node_count++], links[i].right, sizeof(nodes[0]));
+        }
+    }
+
+    // Create adjacency matrix
+    uint8_t **adjacency = calloc(node_count, sizeof(adjacency[0]));
+    for (int i = 0; i < node_count; i++) {
+        adjacency[i] = calloc(node_count, sizeof(adjacency[0][0]));
+    }
+
+    for (int i = 0; i < node_count; i++) {
+        for (int j = 0; j < node_count; j++) {
+            if (i == j) {
+                adjacency[i][j] = 1;
+            }
+            // Check if there's a link from i to j
+            for (int k = 0; k < link_count; k++) {
+                if (!memcmp(links[k].left, nodes[i], sizeof(nodes[0])) && !memcmp(links[k].right, nodes[j], sizeof(nodes[0]))) {
+                    adjacency[i][j] = 1;
+                    break;
+                }
+                if (!memcmp(links[k].right, nodes[i], sizeof(nodes[0])) && !memcmp(links[k].left, nodes[j], sizeof(nodes[0]))) {
+                    adjacency[i][j] = 1;
+                    break;
+                }
+            }
+        }
+    }
+    free(links);
+
+    uint64_t groups = 0;
+    // Check each node that starts with 't'
+    for (int i = 0; i < node_count; i++) {
+        for (int j = i; j < node_count; j++) {
+            if (i == j || adjacency[i][j] == 0) {
+                continue;
+            }
+
+            // We have a link from i to j
+            // Check if there's a k in j's neighbors that has a link to i
+            for (int k = j; k < node_count; k++) {
+                if (k == j || k == i || adjacency[j][k] == 0 || adjacency[k][i] == 0) {
+                    continue;
+                }
+
+                // At least one 't'
+                if (nodes[i][0] != 't' && nodes[j][0] != 't' && nodes[k][0] != 't') {
+                    continue;
+                }
+                groups++;
+            }
+        }
+    }
+
+    printf("%lu\n", groups);
+
+    uint64_t largest_conn_count = 0;
+    for (int i = 0; i < node_count; i++) {
+        uint64_t connections = 0;
+        for (int j = 0; j < node_count; j++) {
+            if (adjacency[i][j] == 1) {
+                connections++;
+            }
+        }
+        if (connections > largest_conn_count) {
+            largest_conn_count = connections;
+        }
+    }
+
+    for (int i = 0; i < node_count; i++) {
+        // Get connected node idxs
+        int *connected = calloc(largest_conn_count, sizeof(connected[0]));
+        int count = 0;
+        for (int j = 0; j < node_count; j++) {
+            if (adjacency[i][j]) {
+                connected[count++] = j;
+            }
+        }
+
+        // Check whether everyone is connected with everyone
+        int good = 1;
+        for (int l = 0; l < count; l++) {
+            for (int j = 0; j < count; j++) {
+                for (int k = 0; k < count; k++) {
+                    if (adjacency[connected[j]][connected[k]] == 0 && l != j && l != k) {
+                        good = 0;
+                        break;
+                    }
+                }
+                if (!good) {
+                    break;
+                }
+            }
+            if (good) {
+                char (*formatted)[2] = calloc(count - 1, sizeof(formatted[0]));
+                int formatted_count = 0;
+                for (int j = 0; j < count; j++) {
+                    if (j != l) {
+                        memcpy(formatted[formatted_count++], nodes[connected[j]], sizeof(nodes[0]));
+                    }
+                }
+                qsort(formatted, count - 1, sizeof(char[2]), cmp);
+                for (int j = 0; j < count - 1; j++) {
+                    printf("%c%c", formatted[j][0], formatted[j][1]);
+                    if (j != count - 2) {
+                        printf(",");
+                    }
+                }
+                printf("\n");
+            }
+        }
+
+        free(connected);
+    }
+
+
+    for (int i = 0; i < node_count; i++) {
+        free(adjacency[i]);
+    }
+    free(adjacency);
+    free(nodes);
+}
diff --git a/day23/input.txt b/day23/input.txt
new file mode 100644
index 0000000..9dce6bc
--- /dev/null
+++ b/day23/input.txt
@@ -0,0 +1,3380 @@
+ht-nz
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diff --git a/day23/sample.txt b/day23/sample.txt
new file mode 100644
index 0000000..3d49766
--- /dev/null
+++ b/day23/sample.txt
@@ -0,0 +1,32 @@
+kh-tc
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