diff --git a/045_jump_game_ii/Makefile b/045_jump_game_ii/Makefile
new file mode 100644
index 0000000..e39cccc
--- /dev/null
+++ b/045_jump_game_ii/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test jump_game.c
diff --git a/045_jump_game_ii/jump_game.c b/045_jump_game_ii/jump_game.c
new file mode 100644
index 0000000..53a8128
--- /dev/null
+++ b/045_jump_game_ii/jump_game.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+static int jump(int* nums, int numsSize) {
+    if (numsSize <= 1) {
+        return 0;
+    }
+
+    int i;
+    int pos = numsSize - 1;
+    int *indexes = malloc(numsSize * sizeof(int));
+    int *p = indexes;
+
+    *p++ = numsSize - 1;
+    while (--pos >= 0) {
+        for (i = 0; i < p - indexes; i++) {
+            if (nums[pos] >= indexes[i] - pos) {
+                indexes[i + 1] = pos;
+                p = indexes + i + 2;
+                break;
+            }
+        }
+    }
+
+    return p - indexes - 1;
+}
+
+int main(int argc, char **argv)
+{
+    int i, count = argc - 1;
+    int *nums = malloc(count * sizeof(int));
+    for (i = 0; i < count; i++) {
+        nums[i] = atoi(argv[i + 1]);
+    }
+    printf("%d\n", jump(nums, count));
+    return 0;
+}
diff --git a/055_jump_game/Makefile b/055_jump_game/Makefile
new file mode 100644
index 0000000..e39cccc
--- /dev/null
+++ b/055_jump_game/Makefile
@@ -0,0 +1,2 @@
+all:
+	gcc -O2 -o test jump_game.c
diff --git a/055_jump_game/jump_game.c b/055_jump_game/jump_game.c
new file mode 100644
index 0000000..8d4e5b0
--- /dev/null
+++ b/055_jump_game/jump_game.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+static bool canJump(int* nums, int numsSize) {
+    if (numsSize == 0) return false;
+
+    int i = numsSize - 1, j;
+    while (i > 0) {
+        if (nums[--i] == 0) {
+            for (j = i - 1; j >= 0; j--) {
+                if (nums[j] > i - j) {
+                    break;
+                }
+            }
+            if (j == -1) {
+                return false;
+            }
+        }
+    }
+
+    return true;
+}
+
+int main(int argc, char **argv)
+{
+    int i, count = argc - 1;
+    int *nums = malloc(count * sizeof(int));
+    for (i = 0; i < count; i++) {
+        nums[i] = atoi(argv[i + 1]);
+    }
+    printf("%s\n", canJump(nums, count) ? "true" : "false");
+    return 0;
+}