最长递增子序列的数量
Number of Longest increasing subsequence
我需要返回数组的LIS
数。
伪代码示例:
if the arr is
int []arr = {2,4,90,-3,-2,-1,-10,-9,-8};
num of LIS is: 3
2,4,90
-3,-2,-1
-10,-9,-8
示例 2:
arr [] = {2,-3,4,90,-2,-1,-10,-9,-8};
num of LIS is: 4
2,4,90
-3,4,90
-3,-2,-1
-10,-9,-8
我尝试这样做:
int [] A = {2,4,90,-3,-2,-1,-10,-9,-8};
int[] dp = new int[A.length];
for (int i = 0; i < A.length; i++) {
dp[i] = 1;
for (int j = 0; j <= i - 1; j++) {
if (A[j] < A[i]) {
dp[i] = dp[i] + dp[j];
}
}
System.out.println(dp[dp.length - 1] ) ;
}
在你的代码中,你只是继续添加到 dp[i] 中,用于内部 for 循环中的所有查找。理想情况下,您应该找到所有位置(j <i)的子序列的最大大小,然后将该最大值添加到>
int maxSizeOfSubseq = 0;
for (int i = 0; i < A.length; i++) {
dp[i] = 1;
maxSizeOfSubseq = 0;
for (int j = 0; j <= i - 1; j++) {
if (A[j] < A[i] && dp[j] > maxSizeOfSubseq ) {
maxSizeOfSubseq = dp[j];
}
}
dp[i] = dp[i] + maxSizeOfSubseq ;
System.out.println(dp[dp.length - 1] ) ;
}
// Now find the Max Size Of Subsequence amongst all computes subsequence lengths
maxSizeOfSubseq = 0;
for(int count = 0 ; count < dp.length; ++count)
{
if(dp[i] > maxSizeOfSubseq )
{
maxSizeOfSubseq = dp[i]
}
}
return maxSizeOfSubseq ;
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