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Create sourcema.md #791

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27 changes: 27 additions & 0 deletions 2019.02.13-leetcode416/sourcema.md
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# leetcode 416
public boolean canPartition2(int[] nums) {
if (nums.length == 0) {
return true;
}
if (nums.length == 1) {
return false;
}
int ret=0;
for (int i:nums){
ret+=i;
}
if ((ret & 1) == 1) {
return false;
}
int mid=ret/2;
boolean[] dp = new boolean[mid + 1];
for (int i = 0; i < dp.length; i++) {
dp[i]=nums[0]==i;
}
for (int i = 1; i < nums.length; i++) {
for (int j = mid; j >=nums[i]; j--) {
dp[j] = dp[j] || dp[j - nums[i]];
}
}
return dp[mid];//1 2 5 WA [2,2,3,5] WA
}