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
bool isMonotonic(int* A, int ASize) {
int i,j,k;
if(ASize==1)
return true;
for(i=1;i<ASize;i++)
{
if(A[i]!=A[i-1])
break;
}
if(i==ASize)
return true;
if(A[i]>A[i-1])
{
for(j=i+1;j<ASize;j++)
{
if(A[j]<A[j-1])
return false;
}
}
if(A[i]<A[i-1])
{
for(j=i+1;j<ASize;j++)
{
if(A[j]>A[j-1])
return false;
}
}
return true;
}