I am so confused on how to tell a run time of a algorithm. so i came up with some ex for me to understand. could any one tell me if i am find the run time right plz.

ex1 - run time for this loop is O(n)? bc it going to loop through n times.

```
for(i = 0; i < n; i++)
{
//do some thing
}
```

ex2 - O(n-1)? bc it going to loop through n-1 times.

```
for(i = 0; i < n-1; i++)
{
//do some thing
}
```

ex3 - O((n)(n)) bc n times n

```
for(i = 0; i < n; i++)
{
for(x = 0; x < n; i++)
{
//do some thing
}
}
```

ex4 - to find value from sorted array is O(n) bc it would run n times.

```
int a[n] = {1,2,3,4};
int x = 2;
for(i = 0; i < n; i++)
{
if(a[i] = x)
{
//do some thing
}
}
```

ex5 - to find value from UNSORTED array also is O(n) bc it would run n times.

```
int a[n] = {4,3,1,2};
int x = 2;
for(i = 0; i < n; i++)
{
if(a[i] = x)
{
//do some thing
}
}
```