Index: aoc2025.c
==================================================================
--- aoc2025.c
+++ aoc2025.c
@@ -11,11 +11,53 @@
 /* === aocYYYYDD =======================================================
 ===================================================================== */
 void aocYYYYDD(char *data, size_t len) {
     (void)len; // unused argument
 }
+
 #endif
+
+/* === aoc202505 =======================================================
+===================================================================== */
+struct Range {
+    long long unsigned lo, hi;
+};
+
+void aoc202505(char *data, size_t len) {
+    (void)len; // unused argument
+    struct Range r[200] = {0};
+    size_t nr = 0;
+    char *err;
+    for (;;) {
+        char *minus = strchr(data, '-');
+        if (!minus) break;
+        *minus = 0;
+        r[nr].lo = strtoull(data, &err, 10);
+        *minus++ = '-';
+        char *enter = strchr(minus, '\n');
+        *enter = 0;
+        r[nr++].hi = strtoull(minus, &err, 10);
+        *enter++ = '\n';
+        data = enter;
+    }
+    unsigned fresh = 0;
+    for (;;) {
+        long long unsigned item = strtoull(data, &err, 10);
+        if (err[0] != '\n') break;
+        if (item == 0) break;
+        data = err + 1;
+        for (size_t k = 0; k < nr; k++) {
+            if ((r[k].lo <= item) && (item <= r[k].hi)) {
+                fresh++;
+                break;
+            }
+        }
+    }
+    printf("There are %u fresh items.\n", fresh);
+
+    // pause for brain storming pause
+}
 
 /* === aoc202504 =======================================================
 ===================================================================== */
 static unsigned evolve(struct RectangularMap *rm, unsigned src) {
     unsigned changes = 0;

Index: aocdailies.c
==================================================================
--- aocdailies.c
+++ aocdailies.c
@@ -4,10 +4,11 @@
 aocfunc *aocselect(unsigned y, unsigned d) {
     aocfunc *p;
     switch (y * 100 + d) {
         default: p = NULL; break;
 
+        case 202505: p = aoc202505; break;
         case 202504: p = aoc202504; break;
         case 202503: p = aoc202503; break;
         case 202502: p = aoc202502; break;
         case 202501: p = aoc202501; break;
 

Index: aocdailies.h
==================================================================
--- aocdailies.h
+++ aocdailies.h
@@ -4,10 +4,11 @@
 #include <stddef.h>
 
 typedef void aocfunc(char *, size_t);
 aocfunc *aocselect(unsigned, unsigned);
 
+aocfunc aoc202505;
 aocfunc aoc202504;
 aocfunc aoc202503;
 aocfunc aoc202502;
 aocfunc aoc202501;