[leetcode-718-Maximum Length of Repeated Subarray]
Given two integer arrays A
and B
, return the maximum length of an subarray that appears in both arrays.
Example 1:
Input:
A: [1,2,3,2,1]
B: [3,2,1,4,7]
Output: 3
Explanation:
The repeated subarray with maximum length is [3, 2, 1].
Note:
- 1 <= len(A), len(B) <= 1000
- 0 <= A[i], B[i] < 100
思路:
动态规划,dp[i][j]代表长度为i的a与长度为j的b 出现相同的子数组的长度值。
如果a[i-1]==b[j-1] dp[i][j] = dp[i-1][j-1]+1;
int findLength(vector<int>& A, vector<int>& B)
{
int m = A.size(), n = B.size();
vector<vector<int>>dp(m + , vector<int>(n + , ));
int ret = ; for (int i = ; i <= m;i++)
{
for (int j = ; j <= n;j++)
{
if (i != &&j != )
{
if (A[i - ] == B[j - ])
{
dp[i][j] = + dp[i - ][j - ];
ret = max(ret, dp[i][j]);
}
}
else dp[i][j] = ;
}
}
return ret;
}
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