5499. Detect Pattern of Length M Repeated K or More Times

Given an array of positive integers `arr`

, find a pattern of length `m`

that is repeated `k`

or more times.

A **pattern** is a subarray (consecutive sub-sequence) that consists of one or more values, repeated multiple times **consecutively **without overlapping. A pattern is defined by its length and the number of repetitions.

Return `true`

*if there exists a pattern of length* `m`

*that is repeated* `k`

*or more times, otherwise return* `false`

.

**Example 1:**

Input:arr = [1,2,4,4,4,4], m = 1, k = 3Output:trueExplanation:The pattern(4)of length 1 is repeated 4 consecutive times. Notice that pattern can be repeated k or more times but not less.

**Example 2:**

Input:arr = [1,2,1,2,1,1,1,3], m = 2, k = 2Output:trueExplanation:The pattern(1,2)of length 2 is repeated 2 consecutive times. Another valid pattern(2,1) isalso repeated 2 times.

**Example 3:**

Input:arr = [1,2,1,2,1,3], m = 2, k = 3Output:falseExplanation:The pattern (1,2) is of length 2 but is repeated only 2 times. There is no pattern of length 2 that is repeated 3 or more times.

**Example 4:**

Input:arr = [1,2,3,1,2], m = 2, k = 2Output:falseExplanation:Notice that the pattern (1,2) exists twice but not consecutively, so it doesn't count.

**Example 5:**

Input:arr = [2,2,2,2], m = 2, k = 3Output:falseExplanation:The only pattern of length 2 is (2,2) however it's repeated only twice. Notice that we do not count overlapping repetitions.

**Constraints:**

`2 <= arr.length <= 100`

`1 <= arr[i] <= 100`

`1 <= m <= 100`

`2 <= k <= 100`

给定一个数组，为是否存在长度为m的子数组，这个子数组重复了至少k词。

观察数据范围，数据量很小，直接暴力求解，代码如下：

```
class Solution {
public:
bool containsPattern(vector<int>& arr, int m, int k) {
int n = arr.size();
if(m * k > n) return false;
for(int i = 0; i < n; ++i) {
int rep = 0;
for(int j = i; j < n; j += m) {
bool good = true;
for(int u = 0; u < m; ++u) {
if(u + j >= n || arr[u + j] != arr[i + u]) {
good = false;
break;
}
}
if(!good) break;
else ++rep;
}
if(rep >= k) return true;
}
return false;
}
};
```

本代码提交AC，用时4MS。