diff --git a/d25/part1_imp.py b/d25/part1_imp.py
new file mode 100644
index 0000000..79515ce
--- /dev/null
+++ b/d25/part1_imp.py
@@ -0,0 +1,20 @@
+S = 0
+I = open("input").read()
+th=2
+@par(num_threads=th,chunk_size=500//th)
+for i in range(500):
+    if I[43*i] == '#':
+        #@par  # much slower
+        for j in range(500):
+            if I[43*j] == '.':
+                for k in range(6,37):
+                    if I[43*i+k]=='#' and I[43*j+k]=='#':
+                        break
+                else:
+                    S += 1
+print(S)
+# 130ms with cpython
+# with codon
+#   par 1 th: 6ms
+#   par 2 th: 4ms
+#  more // is slower
\ No newline at end of file
diff --git a/d25/part1_mm.c b/d25/part1_mm.c
new file mode 100644
index 0000000..3243b48
--- /dev/null
+++ b/d25/part1_mm.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <time.h>
+
+int main() {
+    // from stdin
+    //char I[21500]; // 500 * 43
+    //fread(I, sizeof(char), sizeof(I), stdin);
+    // mmap input
+    struct stat sb;
+    int fd = open("input", O_RDONLY);
+    fstat(fd, &sb);
+    char *I = mmap(NULL, sb.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+    // timer
+    struct timespec start, end;
+    clock_gettime(CLOCK_MONOTONIC, &start);
+
+    int S = 0;
+    for (int i = 0; i < 500; i++) {
+        if (I[43 * i] == '#') {
+            for (int j = 0; j < 500; j++) {
+                if (I[43 * j] == '.') {
+                    int skip = 0;
+                    for (int k = 6; k < 37; k++) {
+                        if (I[43 * i + k] == '#' && I[43 * j + k] == '#') {
+                            skip = 1;
+                            break;
+                        }
+                    }
+                    S += !skip; // Increment S only if skip is false
+                }
+            }
+        }
+    }
+    // stop timer
+    clock_gettime(CLOCK_MONOTONIC, &end);
+    double time_taken = ((end.tv_sec - start.tv_sec) * 1e9 + (end.tv_nsec - start.tv_nsec)) * 1e-9;
+    printf("%f\n", time_taken);
+
+    printf("%d\n", S);
+    return 0;
+}
+// 2ms ; read input is 0.5ms ; process is 1.5ms
\ No newline at end of file
diff --git a/d25/part1_set.py b/d25/part1_set.py
new file mode 100644
index 0000000..27a1178
--- /dev/null
+++ b/d25/part1_set.py
@@ -0,0 +1,9 @@
+A = {
+    frozenset({i for i, c in enumerate(B) if c == "#"})
+    for B in open("input").read().strip().split("\n\n") 
+}
+L = {a for a in A if 1 in a}
+U = A - L
+print(sum(not l & u for l in L for u in U))
+# 40ms with cpython
+# 30ms with codon
\ No newline at end of file