diff --git a/src/main/java/com/code/leet/week/Solution242.java b/src/main/java/com/code/leet/week/Solution242.java
new file mode 100644
index 0000000..7c14460
--- /dev/null
+++ b/src/main/java/com/code/leet/week/Solution242.java
@@ -0,0 +1,97 @@
+package com.code.leet.week;
+
+public class Solution242 {
+    public static void main(String[] args) {
+        Solution242 solution = new Solution242();
+//        System.out.println(solution.minSpeedOnTime(new int[]{5,3,4,6,2,2,7}, 10.92));
+//        System.out.println(solution.canReach("01101110", 2, 3));
+        System.out.println(solution.canReach("00111010", 3, 5));
+    }
+
+    public boolean checkZeroOnes(String s) {
+        if (s.length() == 0 || !s.contains("1")) {
+            return false;
+        }
+        if (!s.contains("0")) {
+            return true;
+        }
+        int[] lengths = new int[2];
+        int start0 = s.indexOf("0");
+        int start1 = s.indexOf("1");
+        int[] maxs = new int[2];
+        char ch = '0';
+        for (int i = 0; i < s.length(); i++) {
+            if (s.charAt(i) == ch) {
+                lengths[ch - '0']++;
+            } else {
+                maxs[ch - '0'] = Math.max(maxs[ch - '0'], lengths[ch - '0']);
+                lengths[ch - '0'] = 0;
+                ch = s.charAt(i);
+                lengths[ch - '0']++;
+            }
+        }
+        maxs[ch - '0'] = Math.max(maxs[ch - '0'], lengths[ch - '0']);
+        return maxs[1] > maxs[0];
+    }
+
+    public int minSpeedOnTime(int[] dist, double hour) {
+        int length = dist.length;
+        if (hour < length - 1) {
+            return -1;
+        }
+        int sum = 0;
+        for (int k : dist) {
+            sum += k;
+        }
+        if (hour > sum) {
+            return 1;
+        }
+        int max = dist[0];
+        for (int i = 1; i < length; i++) {
+            max = Math.max(max, dist[i]);
+        }
+        if ((int) hour == length - 1) {
+            return Math.max(max, (int) (dist[length - 1] / (hour - length + 1)));
+        }
+        int j = max;
+        for (; j > 1; j--) {
+            int free = 0;
+            for (int i = 0; i < length - 1; i++) {
+                free += dist[i] / j;
+                if (dist[i] % j > 0) {
+                    free++;
+                }
+            }
+            if ((hour - free) * j < dist[dist.length - 1]) {
+                break;
+            }
+        }
+        j = j == 1 ? 1 : j + 1;
+        return j > max ? -1 : j;
+    }
+
+    public boolean canReach(String s, int minJump, int maxJump) {
+        if(s.charAt(s.length()-1)=='1'){
+            return false;
+        }
+        if (minJump >= s.length()) {
+            return false;
+        }
+        if (maxJump >= s.length()-1) {
+            return true;
+        }
+        String temp = s.substring(minJump, maxJump + 1);
+        int index = 0;
+        while (temp.lastIndexOf("0") >= 0) {
+            index = minJump + temp.lastIndexOf("0");
+            if (index + minJump >= s.length()) {
+                return false;
+            }
+            if (index + maxJump + 1 >= s.length()) {
+                return true;
+            }
+            temp = s.substring(index + minJump, index + maxJump + 1);
+        }
+        return false;
+    }
+}