diff --git a/src/2021/01.c b/src/2021/01.c
index 22621a6..6f3bcf9 100644
--- a/src/2021/01.c
+++ b/src/2021/01.c
@@ -4,7 +4,25 @@
 #include "input.h"
 
 void advent2021day01(void) {
-  char *input = get_input("input/2021/01");
-  printf("Solution for Day 01 of 2021 is not completed yet\n");
+  size_t sz = 0;
+  int *input = get_ints("input/2021/01", &sz);
+  size_t trips_sz = sz - 2;
+  int trips[trips_sz];
+  int p1 = 0, p2 = 0;
+
+  for (size_t i = 2, j = 0; i < sz; ++i, ++j) {
+    trips[j] = input[i - 2] + input[i - 1] + input[i];
+  }
+
+  for (size_t i = 1; i < sz; ++i) {
+    if (input[i - 1] < input[i]) {
+      ++p1;
+    }
+    if (i < trips_sz && trips[i - 1] < trips[i]) {
+      ++p2;
+    }
+  }
+
+  printf("%d\n%d\n", p1, p2);
   free(input);
 }