20161014

corpsepiges · Oct 14, 2016 · bd6b18f · bd6b18f
1 parent ccc9a97
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Showing 3 changed files with 81 additions and 3 deletions.
diff --git a/Algorithms/416. Partition Equal Subset Sum/Solution.java b/Algorithms/416. Partition Equal Subset Sum/Solution.java
@@ -0,0 +1,39 @@
+public class Solution {
+    int[] nums;
+    int[] sums;
+    int l;
+    public boolean canPartition(int[] nums) {
+        Arrays.sort(nums);
+        this.nums=nums;
+        this.l=nums.length;
+        this.sums=new int[l];
+        sums[0]=nums[0];
+        for (int i = 1; i < l; i++) {
+            sums[i]=sums[i-1]+nums[i];
+        }
+        if (sums[l-1]%2==1) {
+            return false;
+        }
+        return canHalf(l-1, sums[l-1]/2);
+    }
+    public boolean canHalf(int index,int test){
+        if (test==0) {
+            return true;
+        }
+        if (test<0) {
+            return false;
+        }
+        for (int i = index; i >=0; i--) {
+            if (sums[i]<test) {
+                return false;
+            }else if (sums[i]==test) {
+                return true;
+            }else{
+                if (canHalf(i-1, test-nums[i])) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}
diff --git a/README.md b/README.md
@@ -379,7 +379,7 @@
 |394|[Decode String](https://leetcode.com/problems/decode-string/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/394. Decode String/Solution.java)|no|no|no|no|
 |395|[Longest Substring with At Least K Repeating Characters](https://leetcode.com/problems/longest-substring-with-at-least-k-repeating-characters/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/395. Longest Substring with At Least K Repeating Characters/Solution.java)|no|no|no|no|
 |396|[Rotate Function](https://leetcode.com/problems/rotate-function/)|Easy|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/396. Rotate Function/Solution.java)|no|no|no|no|
-|397|[Integer Replacement](https://leetcode.com/problems/integer-replacement/)|Easy|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/397. Integer Replacement/Solution.java)|no|no|no|no|
+|397|[Integer Replacement](https://leetcode.com/problems/integer-replacement/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/397. Integer Replacement/Solution.java)|no|no|no|no|
 |398|[Random Pick Index](https://leetcode.com/problems/random-pick-index/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/398. Random Pick Index/Solution.java)|no|no|no|no|
 |399|[Evaluate Division](https://leetcode.com/problems/evaluate-division/)|Medium|noNote|no|no|no|no|no|
 |400|[Nth Digit](https://leetcode.com/problems/nth-digit/)|Easy|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/400. Nth Digit/Solution.java)|no|no|no|no|
@@ -395,6 +395,6 @@
 |410|[Split Array Largest Sum](https://leetcode.com/problems/split-array-largest-sum/)|Hard|noNote|no|no|no|no|no|
 |411|[Minimum Unique Word Abbreviation](https://leetcode.com/problems/minimum-unique-word-abbreviation/)|Hard|noNote|no|no|no|no|no|
 |415|[Add Strings](https://leetcode.com/problems/add-strings/)|Easy|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/415. Add Strings/Solution.java)|no|no|no|no|
-|416|[Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/)|Medium|noNote|no|no|no|no|no|
+|416|[Partition Equal Subset Sum](https://leetcode.com/problems/partition-equal-subset-sum/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/416. Partition Equal Subset Sum/Solution.java)|no|no|no|no|
 |417|[Pacific Atlantic Water Flow](https://leetcode.com/problems/pacific-atlantic-water-flow/)|Medium|noNote|[Java](https://github.com/corpsepiges/leetcode/blob/master/Algorithms/417. Pacific Atlantic Water Flow/Solution.java)|no|no|no|no|
-|418|[Sentence Screen Fitting](https://leetcode.com/problems/sentence-screen-fitting/)|Hard|noNote|no|no|no|no|no|
+|418|[Sentence Screen Fitting](https://leetcode.com/problems/sentence-screen-fitting/)|Medium|noNote|no|no|no|no|no|
diff --git a/java/416. Partition Equal Subset Sum.java b/java/416. Partition Equal Subset Sum.java
@@ -0,0 +1,39 @@
+public class Solution {
+    int[] nums;
+    int[] sums;
+    int l;
+    public boolean canPartition(int[] nums) {
+        Arrays.sort(nums);
+        this.nums=nums;
+        this.l=nums.length;
+        this.sums=new int[l];
+        sums[0]=nums[0];
+        for (int i = 1; i < l; i++) {
+            sums[i]=sums[i-1]+nums[i];
+        }
+        if (sums[l-1]%2==1) {
+            return false;
+        }
+        return canHalf(l-1, sums[l-1]/2);
+    }
+    public boolean canHalf(int index,int test){
+        if (test==0) {
+            return true;
+        }
+        if (test<0) {
+            return false;
+        }
+        for (int i = index; i >=0; i--) {
+            if (sums[i]<test) {
+                return false;
+            }else if (sums[i]==test) {
+                return true;
+            }else{
+                if (canHalf(i-1, test-nums[i])) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}