Q:
An array is monotonic if it is either monotone increasing or monotone decreasing.
An array A
is monotone increasing if for all i <= j
, A[i] <= A[j]
. An array A
is monotone decreasing if for all i <= j
, A[i] >= A[j]
.
Return true
if and only if the given array A
is monotonic.
Example 1:
Input: [1,2,2,3]
Output: true
Example 2:
Input: [6,5,4,4]
Output: true
Example 3:
Input: [1,3,2]
Output: false
Example 4:
Input: [1,2,4,5]
Output: true
Example 5:
Input: [1,1,1]
Output: true
Note:
1 <= A.length <= 50000
-100000 <= A[i] <= 100000
A:
A
is monotone increasing if for all i <= j
, A[i] <= A[j]
. An array A
is monotone decreasing if for all i <= j
, A[i] >= A[j]
.true
if and only if the given array A
is monotonic.
Example 1:
Input: [1,2,2,3] Output: true
Example 2:
Input: [6,5,4,4] Output: true
Example 3:
Input: [1,3,2] Output: false
Example 4:
Input: [1,2,4,5] Output: true
Example 5:
Input: [1,1,1] Output: true
Note:
1 <= A.length <= 50000
-100000 <= A[i] <= 100000
class Solution { public: bool isMonotonic(vector<int>& A) { int n = A.size(); if(n==0) return true; if(A[0] <= A[n-1]) { return checkIncrease(A); }else{ return checkDecrease(A); } } private: bool checkIncrease(vector<int> &A) { for(int i =0;i<A.size()-1;++i) { if(A[i]>A[i+1]) return false; } return true; } bool checkDecrease(vector<int> &A) { for(int i =0;i<A.size()-1;++i) { if(A[i]<A[i+1]) return false; } return true; } };
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